Dissertationen zum Thema „Nanostructure plasmonique“
Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an
Machen Sie sich mit Top-50 Dissertationen für die Forschung zum Thema "Nanostructure plasmonique" bekannt.
Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.
Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.
Sehen Sie die Dissertationen für verschiedene Spezialgebieten durch und erstellen Sie Ihre Bibliographie auf korrekte Weise.
Guise, Julien. „Fabrication d’un modulateur THz à base de méta-surfaces photo-générées“. Electronic Thesis or Diss., Université de Montpellier (2022-....), 2023. http://www.theses.fr/2023UMONS076.
Der volle Inhalt der QuelleThis thesis will take place between IES in Montpellier and Institute Pascal in Clermont-Ferrand. The doctoral project consists of developing the building blocks of integrated THz modulator based on photo-generated meta-surface. IES and IP collaborate for a few years to develop applications in the mid-infrared and THz range using original concepts such as all-semiconductor plasmonics and photo-generated meta-surface. Recently, they demonstrated the modulation of a THz wave through photo-generated meta-surface in a free-standing slab of un-doped InAs using a 800-nm laser at a weak irradiance of 10 W.cm-2. Nanomir can fabricate lasers with larger irradiance. This modulation of the THz wave is due to the photo-generated free-carriers that transform the InAs slab in epsilon near zero (ENZ) material. The THz wave 50 times smaller than the InAs slab will be reflected and absorbed by the ENZ layer. The thesis project will consist of developing numerical tools at IP to optimise the design including the laser and the un-doped and doped InAs layers. The selected structures will be fabricated at IES in the Nanomir group whereas the photo-modulation process will be characterized in the Photera group
Bayle, Maxime. „Architectures plasmoniques enterrées : élaboration, propriétés optiques et applications“. Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2664/.
Der volle Inhalt der QuelleIn our work, we present the study of plasmonic architectures made of a plane of nanoparticules (NPs) embedded at the vicinity of a dielectric matrix free surface, by low energy ion beam synthesis. Materials structural analysis, especially by transmission electron microscopy, have been carried out to determine the impact of the elaboration process parameters on the three dimensional organization of the NPs, in silicon dioxide or nitride layers grown on silicon substrates. To systematically check these parameters, we studied the elastic and inelastic optical responses of the heterostructures. The elastic response has been obtained by measuring the reflectance of the samples, and confronted to numerical modelling we developed, to determine the mean size of the NPs and the implanted silver amount. The study of the electric field topography allowed us to take benefit from both plasmonic resonance and optical amplification in antireflective layers. The inelastic response has been studied using Raman spectroscopy over a wide frequency range: vibrational collective modes (Lamb modes) of the NPs have been studied at low frequency, while at higher frequency, we have extracted the vibrational density of states (VDOS). Combined with atomistic simulations, the VDOS gave us original information on the vibrational dynamics and the thermodynamic properties of buried silver NPs (and deposited gold NPs). Finally, we present some applications of the assemblies of NPs in hybrid devices, such as the use of coupling between these NPs and deposited substances (e. G. Graphene) on our substrates. In particular, it can be used for surface enhanced Raman spectroscopy (SERS). Then using techniques from microelectronics, we designed plasmo-electronic devices exploiting photoconductance properties of these buried or deposited NPs assemblies
Bryche, Jean-François. „Nanostructuration d'or pour la biodétection plasmonique et la diffusion Raman exaltée de surface : réalisation, caractérisation et modélisation“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO015/document.
Der volle Inhalt der QuelleThis thesis is focused on gold nanostructuration on glass substrate in order to study and optimize their plasmonic properties for biosensing applications. The main goal was to demonstrate the feasibility of combining on a single biochip, Surface Plasmon Resonance Imaging (SPRI) and Surface Enhanced Raman Scattering (SERS) measurements. We have demonstrated that adding a gold film under the nanostructures was highly beneficial for a dual SPRI-SERS characterization. In order to optimize the geometry of the nanostructures and understand the various plasmonic modes, most of the samples were first made by electron beam lithography. Nanoimprinting assisted by UV (UV-NIL) was also developed during this thesis to manufacture samples in large quantities and reply to the future industrial needs for biosensing applications. Performances of these UV-NIL samples were compared with those produced by e-beam lithography. Diameters and periods of gold nanodisks range respectively from 40 nm to 300 nm and 80 nm to 600 nm, depending on the manufacturing technique used. In SERS, enhancement factor of 10^6 to 10^8 were obtained thanks to the presence of the continuous gold film under the nanodisks array. We found that this gain is a function of the thickness of the gold film, the excitation wavelength used and the nanostructures filling factor. In SPRI, we have demonstrated experimentally and theoretically the existence of a coupling between the propagating and localized plasmonic modes, resulting in a new hybrid mode, potentially more sensitive due to its high confinement. Numerical models confirm these results, taking into account the defects found in real samples (rounded edges, imperfect lateral side, adhesion layer). The whole work proposes a better understanding, both experimentally and theoretically, of the plasmonic properties at nanoscale of gold nanostructures with and without an underlying gold film. Moreover, a detailed study of the different technological processes helps to understand which steps significantly impact the plasmonic properties of the samples and their performance as a biosensor. Finally, these samples were characterized and validated on a bimodal instrument SPRI-SERS
Emeric, Ludivine. „Antennes optiques à nanogap alimentées électriquement, interactions entre optique et transport électronique“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS444/document.
Der volle Inhalt der QuelleThe great concentration of light-matter interaction inside optical nanoresonators achieving a strong confinement of electromagnetic field in a nanometric space paves the way toward innovative applications in the infrared domain, in optics, optoelectronics, chemistry or biology. Resonators constituted of a stack of metal, insulator and metal allow to achieve stronger confinement for thinner insulator gap. However, in case of a gap thinner than a few nanometers, electrons have anon-negligible probability to pass from a metal to the other by tunneling effect. Questioning electrons description in classical theory, this quantum effect has been highlighted and studied in various kinds of nanogap optical antennas: between an AFM tip and a substrate, between two nanoparticles, inside a metallic constriction. . .In this thesis, we have used a MIM nanoresonator: stacking solid layers allows a good control ofits geometry and its evolution over time. This structure has two roles: accessing quantitatively the underlying physics and testing its potential application. Nanofabrication processes have been specifically developed and validated by optical and electrical characterizations of nanoresonators. In the quantum domain, measured reflectivity spectra cannot be explained by a widespread approach introducing an electrical conduction inside the insulator. Furthermore, the measured shift under an electrical bias is weak (∆λ/λ ~ 10−3Vapp[V ]) and opposite to literature predictions. These results highlight unexplained behaviors and paves the way to new researches about nanogap optical antennas
Sanchot, Audrey. „Propriétés optiques de nanostructures plasmoniques auto-assemblées : vers la plasmonique moléculaire“. Thesis, Toulouse, INSA, 2011. http://www.theses.fr/2011ISAT0029/document.
Der volle Inhalt der QuelleThis thesis is part of a larger project which uses plasmonic properties of colloidal systems to develop and conceive new submicron scale waveguides. Plasmonics exploits the collective oscillations of free electrons on noble metal surfaces, excited by incident light. Plasmonic waveguides made by lithography have shown potential for the confinement and guiding of light energy. On the other hand, their polycristallinity induces an optical dissipation that limits the propagation length. Our approach consists in using localized plasmons on colloidal and monocrystalline nano-object deposited on dielectric surfaces. Simulations, as well as experiments, have confirmed that the structure and organization of such objects generate both a confinement and an enhancement of the optical near field intensity in their vicinity. The characterization of the near field confinement near tiny plasmonic self-assembled structures presents several difficulties. First, it was necessary to synthesize objects and assemble them into networks, in coplanar geometry. Extended monolayer networks of monoparticle chains were obtained after deposition on a substrate previously immersed in an alkaline solution. In a second step, we have characterized the optical near-field around the colloids. We have applied molecular photomigration to image the near-field with a 50nm spatial resolution. This phenomenon relies on the molecular movement of photochromic films induced under light excitation. An AFM topographic characterization, before and after illumination, allows then to map the near-field intensity. A film migration, only around the object and along the field gradient, has been observed. Finally, we completed this study by using two "far field" techniques, based on "pixel by pixel" scanning of an "optical virtual probe". The two photons photoluminescence (TPL) has shown the possibility to confine or expand the signal, depending on object organization. The recording of map temperature by fluorescence polarisation anisotropy has demonstrated the interest of particle networks as localised heat sources
Thomas, Marjorie. „Fluorescence d’une molécule unique au voisinage d’une nanostructure métallique et étude de systèmes résonants pour la plasmonique dans le domaine visible et infrarouge“. Paris 11, 2004. http://www.theses.fr/2004PA112331.
Der volle Inhalt der QuelleThe doctoral thesis tackles some of the interesting issues regarding the optics of metallic nanostructures. The first part of the thesis is devoted to the influence of a metallic nanostructure, such as a tip, on the emission properties of a single dipolar emitter. The modification of the radiative and nonradiative lifetimes of a fluorescent molecule in the presence of a metallic nanostructure has been investigated. The current work provides a fast algorithm for calculating the fluorescence lifetime and the emission pattern of a molecule in the vicinity of a nanostructure with arbitrary shape, position and orientation. Indeed, it is shown that the emission pattern is strongly dependent on the orientation of the structure with respect to the molecule and on the shape of the object. Furthermore, it has been shown and emphasized that the choice of wavelength is crucial in this problem. By tuning the absorption and emission wavelengths of the emitter with respect to that of the plasmon resonance of the metallic nanostructure, one can adjust the quantum efficiency of the emitter in the near field of the particle. These findings are particularly important for the optimization and interpretation of current experiments on surface enhanced Raman scattering. The second part of the dissertation turns to the coupling among many metallic nanostructures. This topic has attracted much attention in recent years due to its appeal for applications such as integrated optics. One of the driving forces in this field is to replace conventional waveguides which have widths of several wavelengths by a periodic chain in metallic nanoparticles for guiding light. Although due to a strong absorption of visible light these systems are not suitable for long range transport, the fact that light is confined to lateral dimensions of the order of and below the diffraction limit makes them very interesting. The thesis starts by examining a chain of particles analytically based on a coupled dipole model. Next it moves on to numerical studies where various illumination effects and the role of the substrate under the nanoparticles are investigated. In particular, it investigates the dispersion relations of the system which help identify the optimal spectral window for an efficient propagation of light
Vandamme, Nicolas. „Nanostructured ultrathin GaAs solar cells“. Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112111/document.
Der volle Inhalt der QuelleThe thickness reduction of solar cells is motivated by the reduction of production costs and the enhancement of conversion efficiencies. However, for thicknesses below a few hundreds of nanometers, new light trapping strategies are required. We propose to introduce nanophotonics and plasmonics concepts to absorb light on a wide spectral range in ultrathin GaAs layers. We conceive and fabricate multi-resonant structures made of arrays of metal nanostructures. First, we design a super-absorber made of a 25 nm-thick GaAs slab transferred on a back metallic mirror with a top metal nanogrid that can serve as an alternative front electrode. We analyze numerically the resonance mechanisms that result in an average light absorption of 80% over the 450nm-850nm spectral range. The results are validated by the fabrication and characterization of these multi-resonant super-absorbers made of ultrathin GaAs. Second, we use a similar strategy for GaAs solar cells with thicknesses 10 times thinner than record single-junction photovoltaic devices. A silver nanostructured back mirror is used to enhance the absorption efficiency by the excitation of various resonant modes (Fabry-Perot, guided modes,…). It is combined with localized ohmic contacts in order to enhance the absorption efficiency and to optimize the collection of photogenerated carriers. According to numerical calculations, the short-circuit current densities (Jsc) can reach 22.4 mA/cm2 and 26.0 mA/cm2 for absorber thicknesses of t=120 nm and t=220 nm, respectively. We have developed a fabrication process based on nano-imprint lithography and on the transfer of the active layers. Measurements exhibit record short-circuit currents up to 17.5 mA/cm2 (t=120 nm) and 22.8 mA/cm2 (t=220 nm). These results pave the way toward conversion efficiencies above 20% with single junction solar cells made of absorbers thinner than 200 nm
Mou, Ye. „Manipuler l'effet Faraday inverse par l'utilisation de nanostructures plasmoniques inversement conçues“. Electronic Thesis or Diss., Sorbonne université, 2024. https://theses.hal.science/tel-04650863.
Der volle Inhalt der QuelleThe inverse Faraday effect is a magneto-optical process allowing for the magnetization of matter through optical excitation carrying a non-zero spin of light. This light-matter interaction in metals at the nanoscale arises from the generation of drift currents via the nonlinear forces applied by light to the conduction electrons. Particularly, this phenomenon has been conventionally considered symmetrical; right or left circular polarizations generate magnetic fields oriented either in the direction of light propagation or in the direction opposite to propagation. We demonstrate here that by locally manipulating the spin density of light in inversely designed plasmonic nano-antennas, the inverse Faraday effect can be chiral and generate strong stationary magnetic fields due to drift currents only for one helicity of incoming light; furthermore, we demonstrate that this magneto-optical process can have its symmetry reversed, which was considered impossible; and it can even generate unidirectional drift photocurrents as a tunable nano-source for linear THz radiation. This novel optical concept of manipulating the inverse Faraday effect by plasmonic nano-antennas finds diverse applications in ultrafast control of magnetic domains, not only in ultrafast data storage technologies but also in research areas such as nanoscale THz spectroscopy, magnetic trapping, magnetic skyrmions, magnetic circular dichroism, magnetic material manipulation, spin control, spin precession, spin currents, and spin waves, among others
Ntsame, Guilengui Vilianne. „Technologie et étude de résonateurs plasmoniques à base d'InAsSb : vers une plasmonique tout semi-conducteur“. Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20240/document.
Der volle Inhalt der QuelleSurface plasmons polaritons (SPP) are quasi-particles resulting from the strong coupling between the collective oscillations of free carriers in a metal and an electromagnetic wave. They are generated at the interface between a metal and a dielectric. They are studied in detail for several years for their outstanding properties of electromagnetic field confinement at the interface or of filed exaltation. SPP are the building blocks of plasmonics, the area that exploit their optical properties. One of the main characteristics of the SPP is the plasma frequency which is proportional to the density of free carriers. Plasmonics is essentially based on noble metals like gold or silver. However, noble metals are difficult to use in certain ranges of wavelengths, such as infrared, to exploit the electric field exaltation for the detection of molecules in biology. To improve the control of this electric field exaltation, it is necessary to adjust the plasma frequency. It impossible with noble metals that are otherwise incompatible with current microelectronics processes. To overcome these limitations we propose to use heavily doped semiconductors. By changing the doping or the type of the semiconductor, it is possible to change the plasma frequency and thus obtain plasmonic resonances in the mid-infrared. My work deals with the realization and the characterization of doped semiconductors plasmonic gratings. The samples consist of an InAsSb (indium, arsenide, antimonide) layer doped with silicon. This layer is deposited by molecular beam epitaxy (MBE) on a GaSb substrate (gallium antimonide). I have developed an experimental technique based angular dependent reflectivity of rapid and non-destructive characterization of the doping level in the InAsSb layers and thus the plasma frequency. A theoretical model based on Brewster modes allowed explaining the experimental results. I then developed a technological process to achieve the InAsSb gratings. They are based on interference lithography, chemical wet etching and dry plasma etching. By changing the size of the grating, I have demonstrated the ability to control the optical properties of plasmonic resonators. Finally, we have made of InAsSb grating buried into a GaSb layer, using a regrowth by MBE technique. The structure is planarized with a good crystallinity. So it is possible to integrate plasmonic resonators nearby photonic compounds operating in the infrared using only semiconductors. We pave the way for the development of all-semiconductor infrared plasmonics. My thesis is a pioneer work in this field
Mailhes, Romain. „Effets plasmoniques induits par des nanostructures d’argent sur des couches minces de silicium“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI097/document.
Der volle Inhalt der QuelleThin-film photovoltaics focus on lowering the cost reduction of photovoltaic energy through the significant reduction of raw materials used. In the case of thin-films crystalline silicon, the reduction of the thickness of the cell is linked to a drastic decrease of the absorption, particularly for the higher wavelengths. This decrease of the absorption can be fought through the use of several different light trapping methods, and the use of plasmonic effects induced by metallic nanostructures is one of them. In this work, we study the influence of a periodic array of silver nanostructures on the absorption of a silicon layer. This work is decomposed into two main axes. First, the influence of the plasmonic effects on the silicon absorption is highlighted through different numerical simulations performed by the FDTD method. Both finite and infinite arrays of silver nanostructures, located at the rear side of a thin silicon layer, are studied. By varying the parameters of the array, we show that the silicon absorption can be improved in the near infrared spectral region, over a wide range of wavelengths. The second part of the thesis is dedicated to the fabrication of such modeled structures. Two different approaches have been explored and developed inside the lab. For each of these two strategies, three major building blocks have been identified: (i) definition of the future array pattern through a mask, (ii) etching of the pattern in the silicon layer and (iii) filling of the pores with silver in order to form the metallic array of nanostructures. In the first fabrication method, an anodic alumina mask, produced by the electrochemical anodization of an aluminium layer, is used in order to define the dimensions of the metallic array. A metal assisted chemical etching is then performed to produce the pores inside the silicon, which will then be filled with silver through a wet chemical process. The second fabrication method developed involves the use of holographic lithography to produce the mask, the pores in silicon are formed by reactive ion etching and they are filled during an electroless silver deposition step. The fabricated plasmonic substrates are optically characterized using an integrating sphere, and transmission, reflection and absorption are measured. All the characterized plasmonic substrates shown a decrease of their reflection and transmission and an absorption enhancement at the largest wavelengths
Laluet, Jean-Yves. „Éléments de plasmonique“. Strasbourg, 2009. https://publication-theses.unistra.fr/public/theses_doctorat/2009/LALUET_Jean-Yves_2009.pdf.
Der volle Inhalt der QuelleThere is a wide range of applications that could take advantage of the high field and confinement of surface plasmons (SPs). Among these, the ongoing research efforts for the implementation of SP based devices into practical photonic networks are motivated by the nature of the surface wave: miniature SP circuits can combine the compactness of an electronic circuit with the bandwidth of a photonic network. In order to implement this idea, components that are able to launch, control, and detect SPs have to be developped. The aim of the work presented here was to investigate possible approaches for these 3 topics. In addition to the work targeting circuits, some of these results are of practical interest for the design of SP standalone devices that can have strong potentialities for the definition of new optical functionalities. Periodic arrays of subwavelength holes can be used as SP sources. We show how high quality SP beams can be launched. Multiple beams as well as single beam output configurations are proposed, and the issue of an optimal source size is addressed. Beyond the adjustability of the beam profile, we also study the coupling efficiency of light to SP at the level of a single subwavelength slit source. Fano-type interference analysis is carried out in the Fourier plane of the leakage radiation microscope used for measurements in order to quantify the SP generation strength. An optimum source size is found. The next logical step is to get control over propagating SPs. Refractive optics analogous to classical optical components (prism, lens) as well as gradient index media for SPs are developed. They allow to steer and focus the plasmonic flux
Zakharko, Yuriy. „Initial and plasmon-enhanced optical properties of nanostructured silicon carbide“. Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00815382.
Der volle Inhalt der QuelleLoiselet, Ophelliam. „Synthèse et caractérisation d’agrégats bimétalliques pour la magnéto-plasmonique“. Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1033/document.
Der volle Inhalt der QuelleFor several years condensed matter physicists have been interested in the optical and magnetic properties of metallic nanoparticles. Two properties remain largely studied: localized plasmon resonances and magnetic anisotropy at the nanoscale. These two effects resulting from very different electronic properties which are usually encountered in separate nanosystems. Since the 2000's, studies have shown that it is possible to benefit from these two characteristics in a single nanometric system. In this thesis, we will focus on the combination of magnetic and plasmonic properties in systems of size less than ten nanometers: bimetallic clusters of CoAg and CoAu synthesized physically under ultrahigh vacuum and embedded in a matrix (alumina and carbon). We will study the structure of these bimetallic clusters of different stoichiometries and the effect of their environment through the investigation of their optical, magnetic and electronic properties (by electron energy loss spectroscopy (EELS) on individual particles ). We will show the effect of the matrix, carbon or alumina, on the structure of the clusters as well as on their magnetic properties (moment by cluster, anisotropy). In optics we will also see the importance of stoichiometry between noble metal and cobalt on the phenomena of the damping and shifting of the plasmon resonance. Finally we will show the spatial distribution of surface plasmons on single particles by STEM-EELS measurements
Lermusiaux, Laurent. „Nanostructures plasmoniques dynamiques assemblées sur ADN“. Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066007/document.
Der volle Inhalt der QuelleWe demonstrate how gold nanoparticle dimers assembled around a single DNA template exhibiting a specific recognition site, provide a macroscopic optical signal depending on their chemical environment. Electrophoresis enables us to produce purified suspensions of gold nanoparticle dimers, with particle diameters ranging from 8 to 60 nm, with different surface chemistries and sample purities as high as 90%. The DNA template features a hairpin loop in order to switch its shape reversibly when binding a target DNA strand. Interparticle distances are estimated using cryo-electron microscopy and indicate a reversible change of the surface-to-surface distance by a factor of 3 in the case of 8 nm diameter gold particles. In order to translate the dynamic switching of a single DNA scaffold in a measurable optical signal, we study the scattering cross-sections of single 40 nm or 60 nm diameter gold nanoparticle dimers, in microfluidic conditions. We are able to progressively decrease the interparticle distance, at the nanometer scale, by increasing the local salt concentration. This deformation results in a spectral shift of the resonance (up to 100 nm) corresponding to a decrease of the interparticle distance from 20 to 1 nm. Moreover, the good correlation between the spectral responses of individual dimers, estimated using a spectrometer or a CCD color camera, enables us to demonstrate a wide-field low-cost detection method of the nanometric deformation of these nanostructures. Using amphiphilic ligands enables us to optimize the colloidal stability of gold nanoparticle dimers in order to minimize their sensitivity to the local ionic strength and temperature changes
Marty, Renaud. „Réponse optique de nanostructures plasmoniques complexes“. Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1502/.
Der volle Inhalt der QuelleThe interaction between an electromagnetic field and complex plasmonic nanostructures has been studied at different scales of space and time. From a theoretical point of view, the optical response of noble metal nanostructures characterized by surface plasmon resonances (SPR) has been investigated. Through various examples, we have shown that electromagnetic interactions between plasmonic nanostructures change both the distribution and the exaltation of the intensity and result in a redshift of the SPR. We have then calculated the induced charge density and we have identified the multipolar modes excited. Besides, we have used the peculiar distribution of the electric field near plasmonic nanostructures to change the lifetime, the fluorescence intensity and the photon statistics of an emitter. In particular, we have demonstrated that the average time between the emission of two consecutive photons by an isolated fluorophore can be controlled by changing its environment. In addition, the optical properties of individual plasmonic nanostructures have been studied experimentally. We have characterized their SPR in the far-field by measurements of extinction. The topography of the electric field in their vicinity has been carried out by two-photon photoluminescence. The vibrational dynamics of gold nanostructures has finally been studied by femtosecond spectroscopy. The high sensitivity of the position of the SPR to the shape and size of objects has allowed us to detect acoustic vibration modes and evidenced the effect of environment on their damping
Moknache, Amazir. „Contribution au calcul de nanostructures plasmoniques terahertz“. Paris 6, 2013. http://www.theses.fr/2013PA066132.
Der volle Inhalt der QuelleThe emergence of nanotechnology today makes possible the use and operation of surface phenomena inadequately treated to date. Indeed, the transition from the microscopic scale to the nano scale strongly favors surface effects on the effects of volume and has an advantage for devices operating in the range of optical wavelengths , classical field of surface plasmon. The extension to the THz of these phenomena is now the subject of numerous studies and may be useful for various applications requiring compactness and high spatial resolution, such as imaging, biology. To develop innovative solutions induced by the use of surface plasmons in the THz field, an initial modeling and simulation of simple structures is conducted, first in the optical domain. The materials considered are then the gold, silver or aluminum, and are deposited in thin layers of a few tens of nanometers on the given substrates. The study of surface plasmons in the THz field is then attempted with conductive material which is deposited in ultra thin layers or with nanostructured metal surfaces with patterns and givien geometries. In this case we have developed a method of analysis and synthesis that can determine all the conditions required to generate THz plasmons on surface "easy" to machine
Olivéro, Aurore. „Développement d'un instrument plasmonique bimodal couplant SPRI et SERS pour la détection et l'identification de molécules biologiques“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO017/document.
Der volle Inhalt der QuelleSurface Plasmon Resonance Imaging (SPRI) is a powerful technique to study molecular interactions providing a real time, label free and high throughput analysis. The transduction of an interaction between complementary molecules into an optical signal is based on the perturbation of a plasmonic evanescent wave supported by a thin metallic film.However, despite its direct and label free assets, the specificity of SPR measurements is only guaranteed by the probe molecules grafted on the metallic surface and therefore by the quality of the surface chemistry. This limitation becomes an issue when addressing major health concerns relying on the detection of trace molecules. In particular, new systems are required to help early diagnosis and the control of food contaminants.In view of improving measurement’s specificity, this work reports the development of a bimodal instrument coupling SPRI, allowing the quantification of captured molecules, with Surface Enhanced Raman Spectroscopy (SERS), adding the precise identification of the molecules by measuring their spectroscopic fingerprint. This PhD is part of an ANR project bringing together academic and industrial partners.This manuscript focuses on the development of the optical instrument combining the two detection systems in a unique prototype. SPRI measurements are performed in the Kretschmann configuration while SERS analysis is implemented from the top, in solution, through a glass window. Nanostructured substrates have been designed and realized to allow the simultaneous experiment.The optical system is described, characterized and validated on the model case of a DNA hybridization. These first results prove the capabilities of the bimodal instrument in the perspective of more complex biological applications
Ung, Thi phuong lien. „Control disorder for electromagnetic localization in plasmonic devices for nanophotonic application“. Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV013/document.
Der volle Inhalt der QuelleMetallic nanostructures allow to confine light at subwavelength scales by the excitation of surface plasmon. They open the way for many applications in imaging, photonic components development and quantum information. This thesis deals with the study of metallic nanostructures, semi-continuous or based on holes gratings with a controlled disorder, and their interaction with colloidal semiconductor nanocrystals that are very photostable. Combining several complementary experimental approaches (far-field spectroscopy, near-field optical microscopy, near-field active probe microscopy, characterization by confocal microscopy of the emission of nanocrystals coupled to the metallic surfaces), we were able to highlight specific characteristics of the plasmon modes of these different structures. For the gratings with a controlled disorder, we have in particular analyzed the emergence of intense localized modes and determined the influence of parameters such as the thickness of the gold layer, the diameter of the holes or the initial periodicity of the grating. The experimental results are in very good agreement with the numerical simulations carried out by FDTD
Belacel, Cherif. „Emission de nanocristaux semi-conducteurs dans une antenne patch plasmonique“. Paris 6, 2013. http://www.theses.fr/2013PA066715.
Der volle Inhalt der QuelleIn this thesis, we experimentally demonstrate the control of the spontaneous emission rate and the radiation pattern of colloidal quantum dots deterministically positioned in a plasmonic patch antenna proposed by the J. J. Greffet’s team at IOGS laboratory. The nano-emitters used here are CdSe/CdS colloidal nanocrystals emitting in the visible wavelengths at room temperature. The antenna consists of a thin gold microdisk 30 nm above a thick gold layer. This structure confines the electromagnetic field in a small volume allowing reaching a Purcell factor up to 180 for a diameter of 160nm. These antennas are made by in-situ lithography technique developed by P. Senellart at LPN laboratory (Marcoussis). This technique consists in centering on the quantum emitter by maximizing the photoluminescence signal detection with 25nm accuracy, then, the photonic or a plasmonic structure is drawn with a laser. The emitters are shown to radiate through the entire patch antenna in a highly directional and vertical radiation pattern. Strong acceleration of spontaneous emission is observed, depending of the antenna size. Considering the double dipole structure of the emitters, this corresponds to a Purcell factor up to 80 for dipoles perpendicular to the disk. We also developed in this thesis, an in-situ lithography technique that allows the coupling of the optical patch antenna to a single nanocrystal
Suck, Sarah. „Holographie hétérodyne numérique pour l'étude des nanostructures plasmoniques“. Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00659821.
Der volle Inhalt der QuelleKessentini, Sameh. „Modélisation et optimisation de nanostructures plasmoniques : applications biomédicales“. Troyes, 2012. http://www.theses.fr/2012TROY0024.
Der volle Inhalt der QuelleThe present work deals with the modelling and optimization of the plasmonic structures: nanostructured biosensor for early disease diagnosis, and gold nanoparticles for photothermal therapy. Both structures are based on interaction with light. For modelling, the electromagnetic scattering problem is therefore solved using Mie theory and discrete dipole approximation (DDA). The numerical model is extended to take into account many parameters of biosensors. Then, the validity of the model is checked through comparison to experimental results. To optimize such problems of continuous variables, the particle swarm optimisation (PSO) is chosen. A plasmonic benchmark is introduced to test a set of algorithms and reveals some limitations. For this, we introduce a new memetic adaptive PSO (AMPSO) algorithm. The AMPSO is tested on a set of reference benchmark as well as the plasmonic benchmark and demonstrates its ability to find the global optimum solution rapidly. The optimization of biosensor shows that its sensitivity (given by the surface enhanced Raman spectroscopy gain) can be improved six times compared with the best experimental results. The optimization of nanoparticules (maximization of light absorption) reveals, as well, improved results compared to previous studies. Moreover, the optimized nanoparticles are compared to each other. Finally, the design tolerance of these nanostructures is also discussed
Bresson, Paul. „Étude des phénomènes thermiques ultrarapides dans les nanostructures plasmoniques“. Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST005.
Der volle Inhalt der QuelleThermoplasmonics is a branch of plasmonics exploiting thermal phenomena in metallic structures. Long regarded as problematic, Joule losses due to the absorption of light by metallic nanoparticles are now considered as a starting point for many applications: thermal nanosources in medicine, magnetic recording, chemical catalysis, thermotronics or energy conversion.The use of femtosecond lasers on plasmonic structures, allows the creation of spatially confined nanosources of heat reaching very high electronic temperatures compared to the temperature of the atomic lattice. The absorption by a metal of a pulse of energy can be described in three main steps. Firstly, an absorption of photons by the electrons of the metal increases the electron energy on the scale of a hundred femtoseconds with electronic temperatures that can reach thousands of Kelvin, while the lattice temperature remains almost constant. Then, a second step, in which the electron-phonon interactions transmit the energy absorbed by the electrons to the grid, allowing the electrons and phonons to reach equilibrium. Finally, the energy is dissipated into the substrate surrounding the metal by thermal conduction.Many models exist in the literature to describe the non-equilibrium between electrons and phonons. However, a rigorous and quantitative comparison with experimental data is lacking to validate or invalidate these models. This was the main objective of this study.To study these phenomena, I used a pump-probe experiment where the pump allows an ultra-fast heating of the sample which causes a change in the permittivity of the metal. The probe beam then allows to measure the variations in the reflection and transmission spectrum, caused by the change in permittivity.I set up a numerical code allowing to model the temperature evolution in a 3D mesh of a structure composed of dielectric and metallic elements. This thermal model takes into account the various energy transport phenomena in a metal such as electron-phonon coupling, electron and phonon thermal conduction and ballistic displacement of non-thermalized electrons. Then, via a model of permittivity as a function of temperature taking into account the interband and intraband transitions, this model was coupled to an optical model to simulate the evolution of the optical spectra of a structure as a function of its temperature in order to be able to confront this numerical model with the experimental results by data fitting.This numerical model has been validated on numerous pump-probe experiments carried out on gold films of various thicknesses and gold nanostructure arrays on glass or gold film. We were able to show that, among the very large number of optical and thermal parameters involved in the model, all these experimental data could be adjusted using a very small number of free parameters, thus confirming the robustness of the model. Finally, this model was used to design and optimize samples allowing the experimental demonstration of heat propagation on scales of a few hundred nanometers within a gold nanostructure
Lalisse, Adrien. „Optimisation thermique de nanostructures plasmoniques : conception, modélisation et caractérisation“. Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066081/document.
Der volle Inhalt der QuelleFocusing light on the nanoscale in order to create intense optical or thermal nanosources is probably the main challenge facing the nano-optics community, in order to power up future devices. Metallic nanoparticles and their surface plasmon resonance are ideal optical or thermal nanosources.In this context, this thesis aims at providing a possible solution to the issues of thermal optimization at the nanoscale and nanothermometry.By carrying out numerical simulations, we were able to highlight the heat generation properties of titanium and zirconium nitrides, exceeding those of gold, which make them ideally suited in order to conceive and fabricate heat nanosources in the visible. We also managed to obtain a particle morphology inducing a maximum heating at a given wavelength : a three-branchs nanostar.We fabricated gold nanostructures by e-beam lithography in order to characterize them with photothermal holography. By exploiting the two kind of informations available with this far-field optical technique, the amplitude and the optical phase, we strove to quantify the temperature variations of gold nanorods. The photothermal holography setup based on amplitude delivered semi-quantitative temperature measurements, and the phase based-technique, still at a preliminary stage of developpement, proves to be a new and promising tool for the study of optical and thermal properties of plasmonic nanostructures
Zakharko, Yuriy. „Initial and plasmon-enhanced optical properties of nanostructured silicon carbide“. Electronic Thesis or Diss., Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0105.
Der volle Inhalt der QuelleNanostructured silicon carbide (SiC) is considered today as a good alternative to the conventional materials for various multidisciplinary applications. In this thesis, SiC nanostructures were elaborated by means of electrochemical etching and laser ablation techniques. The first part of the thesis clarifies size-dependence of optical properties as well as importance of local-field effects onto the photoinduced electronic transitions of SiC nanostructures. In the second part of the thesis strong 15-fold photoluminescence enhancement of SiC nanoparticles is ensured by their near-field interactions with multipolar localized plasmons. Further, 287-fold and 72-fold plasmon-induced enhancement factors of two-photon excited luminescence and second harmonic generation is achieved, respectively. The main physical mechanisms responsible for the observed effects were described by three-dimensional finite-difference time domain simulations. Finally, the coupling effect of luminescent SiC nanoparticles to plasmonic nanostructures is used in the enhanced labelling of biological cells on the planar structures. As a perspective, colloidal plasmonic (Au@SiO2)SiC nanohybrids were elaborated and characterized
Abid, Ines. „Plasmonique hybride : propriétés optiques de nanostructures Au-TMD, couplage plasmon-exciton“. Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30333/document.
Der volle Inhalt der QuelleTransition metal dichalcogenide materials (TMDs) are increasingly gaining attention, due to their unique optical, spintronic, and electronic properties. These properties result from the ultimate confinement in 2D monolayers of a direct band-gap semiconductor and the lack of inversion symmetry in the crystallographic structure. To control and enhance the optical response of these materials, it is interesting to integrate them with plasmonic nano-resonators. The TMDs/plasmonic hybrid systems have been extensively studied for plasmon-enhanced optical signals, photocatalysis, photodetectors, and solar cells. In this context, this thesis deals with the interaction between TMD monolayers and gold nanostructures. In a first part, an hybrid system composed of CVD grown MoSe2 monolayers transferred on gold nanodisks was studied. Surface plasmon resonance was tuned by controlling the nanodisks size and the inter-disks separation. The optical properties of the nanostructures are probed by means of spatially resolved optical transmission and photoluminescence spectroscopies. Fano-type coupling regime between the surface plasmon of the gold nanodisks and the MoSe2 exciton was evidenced by a quantitative analysis of the optical extinction spectra based on an analytical model. Our interpretations were supported by numerical simulations. The number of MoSe2 monolayer dependence as well as the Temperature dependence of the plasmon-exciton interaction was investigated. Our results were quantatively analysed on the nanometric scale by studying the local electromagnetic near-field and the excitonic transition dipole momentum interaction. Furthermore, the Raman scattering of MoSe2@Au system was carried out. A particular situation was investigated where a resonant interaction between the surface plasmon of nanodisks and A exciton of v occur. The contribution of these two resonances leads to a resonant surface enhanced Raman scattering (SERRS) effect. The Raman Scattering excitation is selected to resonantly excite the Surface Plasmon resonance and MoSe2 excitonic transition simultaneously. The relative contribution of the surface Plasmon and the confined exciton to the resonant Raman scattering signal is pointed out. In this resonant condition, a hyperthermia effect was detected. Numerical simulations of the SERS gain were useful to figure out the main factors affecting the SERS intensity enhancement in MoSe2@Au. In a second part, the TMD monolayer was used as a substrate of Au nanoparticles. Au nanoislands were deposited on mono- and few-layered MoSe2 flakes. Photoluminescence (PL) measurements revealed a net quenching of the MoSe2 photoluminescence. To figure out the origin of this quenching three possibilities were discussed (i) the charge transfer between the TMD monolayer and the Au particles (ii) the direct to indirect gap transition of the TMD electronic band structure caused by the strain induced by the metal deposition (iii) structural disorder imparted by the nanoparticles in the TMD/metal interface. Owing to the Raman scattering measurements and using the radiative emission of the gold nanoparticles, we evidenced a charge transfetrt between the metallic nanostructures and the semiconductor. In order to complement our interpretations a comparative study with respect to optical properties of TMD covered by a silica film was carried out. The present work was held within the NeO group in CEMES, in a frame of a collaboration with the group of thr Pr. Jun Lou from Rice university, Houston
Ethis, de Corny Maëliss. „Caractérisation de la génération de second harmonique dans des nanostructures plasmoniques“. Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY074.
Der volle Inhalt der QuellePlasmonic nanostructures have the ability to support localised surface plasmon resonances characterized by a collective oscillation of the free electrons in metal. This phenomenon, know to generate an intense local field, can be used to enhance nonlinear optical processes at the nanoscale level. In this thesis, we have investigated the second harmonic generation (SHG) process in aluminum and gold nanostructures. First, we have studied the origin of this nonlinear process and highlighted the major role played, in gold, by the bulk nonlocal contribution, originating from the field gradients inside the nanostructure volume. Then, we pointed out, by achieving a double resonance regime associated with a plasmonic mode matching at the excitation and emission, the possibility to enhance significantly the harmonic response of compact aluminum nanoantennas. In order to increase even more the nonlinear intensity, an idea is to couple these nanostructures to a nonlinear nanocrystal to benficiate both from the field enhancement provided by the metallic nanoantenna and from the nonlinearity of the nanocrystal. To optimise the harmonic intensity generated by these hybrid structures, have nanocrystals with a strong intrinsic nonlinearity is required. To this end, we have measured the harmonic response of single latanide iodate nanocrystals, in order to evaluate their ability to integrate this type of structure. Moreover, we have implemented a near-field optical microscope used to manipulate nancorystals in the vincinity of metallic nanostructures. This thesis, by bringing new elements to understand and optimise the SHG process in plasmonic nanostructures, provides new perspectives to elaborate efficient optical components to frequency conversion at the nanoscale
Girard-Desprolet, Romain. „Filtrage spectral plasmonique à base de nanostructures métalliques adaptées aux capteurs d'image CMOS“. Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT053/document.
Der volle Inhalt der QuelleImage sensors have experienced a renewed interest with the prominent market growth of wireless communication, together with a diversification of functionalities. In particular, a recent application known as Ambient Light Sensing (ALS) has emerged for a smarter screen backlight management of display-based handheld devices. Technological progress has led to the fabrication of thinner handsets, which imposes a severe constraint on light sensors' heights. This thickness reduction can be achieved with the use of an innovative, thinnest and entirely on-chip spectral filter. In this work, we present the investigation and the demonstration of plasmonic filters aimed for commercial ALS products. The most-efficient filtering structures are identified with strong emphasis on the stability with respect to the light angle of incidence and polarization state. Integration schemes are proposed according to CMOS compatibility and wafer-scale fabrication concerns. Plasmon resonances are studied to reach optimal optical properties and a dedicated methodology was used to propose optimized ALS performance based on actual customers' specifications. The robustness of plasmonic filters to process dispersions is addressed through the identification and the simulation of typical 300 mm fabrication inaccuracies and defects. In the light of these studies, an experimental demonstration of ALS plasmonic filters is performed with the development of a wafer-level integration and with the characterization and performance evaluation of the fabricated structures to validate the plasmonic solution
Jiang, Quanbo. „Réalisation et optimisation de structures plasmoniques pour le couplage directionnel de la lumière“. Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY086/document.
Der volle Inhalt der QuelleIn this project, two contributions are reported. Firstly, the directional and singular generation of Surface Plasmon Polaritons (SPPs) in the nanoapertures is investigated using the Leakage Radiation Microscopy (LRM). We demonstrate experimentally spin-driven directional coupling as well as singularity (inward) and vortex (outward radial coupling) of SPPs by nanostructures built with T-shaped and Λ-shaped apertures.To support our experimental findings, we develop an analytical model based on a multidipolar representation of Λ- andT-shaped aperture plasmonic couplers, allowing a theoretical explanation of both directionality and singular SPP formation. The optimal apex angle of Λ-shaped apertures shows the possibility to maximize the directiviy and extinction ratio for both directional coupling and singular SPP generation in the far field. Besides, our method based on LRM detection, allows quantitative analysis and is proven to be a sophisticated characterization technique for mapping the SPP vortex field.It also provides several new possibilities for polarization-controlled SPP sub-wavelength focusing.Secondly, the spin-orbit coupling of light into a photonic waveguide and its reciprocal effect are realized and confirmed both experimentally and theoretically. Coupler and decoupler gratings on the waveguide are firstly developed and investigated. The radiation of the confined light from the decoupler provides us a possibility to detect the guided waves. The fluorescence of nanocrystals deposited on the sample surface shows another possibility to directly visualize the light propagation in the waveguide. The spin-driven directional coupling is achieved by Λ-shaped antennas and is certified by the dark field images with decouplers and the fluorescence images. Furthermore, the reverse effect is observed with an imperfection of output polarization which is explained that the diffraction orders by the Λ-shaped apertures influence the final polarization states based on an analytical model. Thus, the reciprocal effect is realized by selecting the specific diffraction region on the Fourier plane. We believe that the quantitative characterization of spin-orbit interactions will pave the way for developing new directional couplers in the field of nanophotonics such as quantum information processing and so forth
N'Konou, Kokou Kekeli David. „Nanostructures plasmoniques de type coeur-coquille métal-diélectrique pour cellules photovoltaïques organiques“. Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0148/document.
Der volle Inhalt der QuelleOne of the approaches to improve the organic solar cells performance without increasing the thickness of the photoactive layer is to incorporate metallic nanoparticles (NPs) in this layer or in its proximity to have benefited from light scattering or localized surface plasmon resonance effects. However, these NPs can generate charge carriers recombination, short circuits or exciton quenching due to the contact with the metal. A solution is then to coat these MNPs with a dielectric (thin shell or layer) to protect them. The objective of this thesis is to study the influence of metaldielectric coreshell nanostructures on the optical and photoelectric performances of organic solar cells, by using numerical modeling and experiments. First, a predictive numerical analysis by FDTD modeling allowed us to optimize the influence of architectural and optogeometric parameters on optical properties of plasmonic organic solar cells. Silver or gold core nanospheres (NSs) coated with a thin silica shell were synthesized and characterized. Finally, the integration of chemically synthesized Ag@SiO 2 NSs (wet process) or Ag/SiO 2 NPs deposited by evaporation (dry process) in inverted organic solar cells has increased the photocurrent by 12% or 18%, respectively, compared to the reference cell(without NSs)
N'Konou, Kokou Kekeli David. „Nanostructures plasmoniques de type coeur-coquille métal-diélectrique pour cellules photovoltaïques organiques“. Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0148.
Der volle Inhalt der QuelleOne of the approaches to improve the organic solar cells performance without increasing the thickness of the photoactive layer is to incorporate metallic nanoparticles (NPs) in this layer or in its proximity to have benefited from light scattering or localized surface plasmon resonance effects. However, these NPs can generate charge carriers recombination, short circuits or exciton quenching due to the contact with the metal. A solution is then to coat these MNPs with a dielectric (thin shell or layer) to protect them. The objective of this thesis is to study the influence of metaldielectric coreshell nanostructures on the optical and photoelectric performances of organic solar cells, by using numerical modeling and experiments. First, a predictive numerical analysis by FDTD modeling allowed us to optimize the influence of architectural and optogeometric parameters on optical properties of plasmonic organic solar cells. Silver or gold core nanospheres (NSs) coated with a thin silica shell were synthesized and characterized. Finally, the integration of chemically synthesized Ag@SiO 2 NSs (wet process) or Ag/SiO 2 NPs deposited by evaporation (dry process) in inverted organic solar cells has increased the photocurrent by 12% or 18%, respectively, compared to the reference cell(without NSs)
Grégoire, Alexandre. „Étude de l’exaltation de fluorescence dans des assemblages linéaires de nanoparticules plasmoniques“. Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/40333.
Der volle Inhalt der QuelleChehadi, Zeinab. „Nanostructures hybrides Au/Semi-conducteur : investigation des effets plasmoniques en catalyse sous lumière visible“. Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0016/document.
Der volle Inhalt der QuelleThe excitation of Localized Surface Plasmon Resonance (LSPR) of Gold NanoParticles (GNPs) can give many physical effects such as near-field enhancement, heat generation and hot electron injection, which have been investigated in many chemical transformations. In that context, the plasmonic photocatalysis based on electron transfer from GNP to a semi-conductor has been proposed. However, few studies are focused on the influence of LSPR features and the respective contribution of its local effects (thermal and electronic) on the photocatalytic activity. These issues are addressed herein through 3 catalytic reactions. First, the efficient and selective oxidation of glycerol in the presence of supported GNPs is demonstrated under laser irradiation and without any external source of heat, thanks to the local heat generation and hot electron transfer. The respective contributions of these effects is further investigated in plasmonic photocatalysis by following the degradation of Bisphenol-A. Our results show that GNP plays a major role through hot electron transfer but also as a nano-source of heat that accelerates the reaction and leads to a fast and total elimination of this endocrine disruptor. Finally, an optical set-up is developed for studying the plasmonic photocatalysis at the nanoscale. For this, a hybrid system of GNPs coupled to a TiO2 nanofilm is realized by laser nanostructuring. Our investigations show that photocatalytic activity is correlated to the LSPR (size and shape of GNPs, hot spots). These results open the way for exploiting valuable and industrial reactions under solar light
Héron, Sébastien. „Nanostructures pour l'exaltation d'effets non linéaires“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX082/document.
Der volle Inhalt der QuelleInfrared sources based on second order effects are interesting tools for atmospheric pollutants spectrometry thanks to their wide tunability. Such effects nevertheless demand strong incident powers or massive non linear crystals to be efficient. A new way to reduce their size consists in realizing frequency conversion with the help of plasmonic nanostructures containing dielectric inclusions showing a non zero second order susceptibility. Light is greatly harvested and concentrated at resonance leading to the creation of a great quantity of non linear polarization, so as to further enhance non linear optics effects.This work begins with a study of nanoresonators through developing a simulation tool for one dimensional nanostructured multilayered structures. Three architectures are retained : slit nanoresonators, optical Helmholtz nanoresonators and waveguides based on guided mode resonances. In every case, the conception focuses on the finding of bi- and even of tri-resonant geometries to achieve mode matching for second harmonic of difference frequency generation.Clean room fabrication is then detailed step by step following the important works that have permitted the fabrication of samples showing a very good quality
Paparone, Julien. „Contrôle de l’émission dans des nanostructures plasmoniques : nanoantennes multimères et plasmons long-range“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1178/document.
Der volle Inhalt der QuelleThe object of this thesis is the coupling between luminescent nanocristals and metallic nanostructures. These structures show numerous interest in a large variety of applications thanks to the apparition of electromagnetic surface wave known as plasmons whose properties are tailored with the geometry of these structures. In this thesis, two types of geometry will be adressed : the long-range plasmons, and plasmonic nanoantennas. In a first time, the study focuses on a geometry in which two propagative surface plasmons are coupled through a thin metal film; creating a new type of plasmons with extended propagation lenghts. By coupling the emission of nanocristals in such a geometry, the energy repartition in the different desexcitation channels available has been adressed. The viccinity of the metal has also proved to increase the spontaneous decay rate up to 1.7. The non trivial contribution of conventional waveguide modes has also been demonstrated. In a second time, the potential of using metallic nanoparticles in a pillar geometry as nanoantennas to enhance and redirect the spontaneous emission has been investigated. The structure is composed of a metallic dimer creating a hotspot on top of which another metallic nanoparticles has been placed. FDTD simulations has shown that this kind of geometry can lead to few loss (<10%), a strong enhancement of the emission rate (>x80), a redirection of the emission and paves the way to wavelenght multiplexing possibilities. Besides, these structures present the advantage to be compatible with modern thin film elaboration techniques. Preliminary realisations have then been introduced
Petreto, Alexandra. „Fonctionnalisation optimisée de différentes surfaces par des paires de FRET pour des applications de biodétection en plasmonique et en microfluidique“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS048/document.
Der volle Inhalt der QuellePatient care quality relies on the availability of efficient diagnostics tools. Development of biosensors based on Förster resonance energy transfer (FRET) allows for the detection of specific biomarkers with high precision and sensitivity. FRET is a distance dependent energy transfer process that is frequently used in biosensing applications, in which biological recognition, functions or structures are within the 1 to 20 nm length scale. This PhD thesis presents the establishment of fabrication and functionalization processes for the optical FRET detection of molecules of biological interest, toward an application in clinical diagnostics and DNA sequencing.This work presents a FRET study on functionalized aluminum surfaces, which is the first step towards the development of a sequencing platform using plasmonics enhanced FRET. Quantitative FRET detection on silanized aluminum surfaces was extensively investigated and the results of different characterization methods (contact angle, FTIR spectroscopy, fluorescence imaging) are discussed in details.This manuscript also describes the development of a functionalized microfluidic device for the realization of a multiplexed FRET immunoassay. With the aim of designing a functionalized integrated device for FRET detection in microfluidic conditions, I developed a strategy for the realization of a microfluidic optical multiplexed FRET biosensor. Preliminary FRET results between two labeled antibodies in a microfluidic channel demonstrate the feasibility of such a biosensing platform
Coste, Antoine. „Nanocristaux semi-conducteurs : couplage avec des structures plasmoniques à 4 K et effets collectifs“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV066/document.
Der volle Inhalt der QuelleColloidal semiconductor nanocrystals are fluorescent semiconductors with a nanometric size. Bright at room temperature and chemically synthesized, nanocrystals are interesting candidates for differents applications as lighting, biological labeling or photovoltaic.My experimental work, is part of the development of these emitters by two differents approaches : coupling with plasmonic structures at 4,K and formation of collective emission.First, we studied the coupling between single nanocrystals and a flat gold film in order to decrease the optical losses. To begin we studied the influence of the temperature. With some photoluminescence measurements and some simulations, we show significant decrease of the enhancement of the photoluminescence decay rate at 4,K. This reduction is linked to the decrease of optical losses. Then, we studied the influence of crystallinity of gold. We show again an important reduction of enhancement of the photoluminescence decay rate with crystalline gold compared to amorphous layer.Second, we investigated the optical properties of compact nanocrystal clusters encapsulated in a silica shell. At room temperature, we observed an enhancement of the photoluminescence decay rate through Förster resonance energy transfer (FRET). At 4K, we measured an important variation of the emission dynamic with emergence of two times scales. At short time scale, emission is accelerated and governed by the exciton recombination. At long time scale, the decay is governed by power law showing the emergence of long-lived states
Halagacka, Lukas. „Theoretical and experimental study of novel integrated magnetoplasmonic nanostructures“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112279/document.
Der volle Inhalt der QuelleThis work studies the enhancement of the transverse magneto-optical Kerr effect by exploiting extraordinary resonances occurring in 1D periodic grating. The 1D periodic gold grating structure was designed, described, numerically simulated, and fabricated. A rigorous Coupled Wave Algorithm (RCWA) developed for parallel computing is used for the theoretical study of resonant modes in magnetoplasmonic gratings and for analysis of optical and magneto-optical data measured by Mueller matrix ellipsometry. The impact of coupling between Fabry-Perot modes inside grating air-gaps and surface plasmon mode at the interface between gold and MO garnet layer is studied via spectra of specular reflectivity and for the various angles of incidence. In a first step, the optical functions of the (CaMgZr)-doped gallium-gadolinium garnet (sGGG) substrate and the Bi-substituted gadolinium iron garnet (Bi:GIG) are obtained in the spectral range from 0.73 eV to 6.42 eV (wavelength range 193 nm – 1.7 μm). Subsequently, the spectra of the magneto-optical tensor components are obtained by applying an external in-plane magnetic field in longitudinal and transverse geometry. The obtained functions are then used for numerical simulations demonstrating that by hybridization of surface and cavity resonances in this 1D plasmonic grating, the transverse Kerr effect can be further enhanced, extinguished or even switched in sign and that without inverting or modifying the film's magnetization. To confirm theoretical results a set of samples, gratings with a different width of an air-gap, was fabricated using electron beam lithography and liftoff technique. To be able to reproduce Mueller matrix data from the samples, the models describing realistic structures were further developed and optimized. Experimental measurements of real structures confirm transverse MO effect enhancement using magnetoplasmonic effects and prove applicability of numerical models
Vedraine, Sylvain. „Intégration de nanostructures plasmoniques au sein de dispositifs photovoltaïques organiques : étude numérique et expérimentale“. Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00799088.
Der volle Inhalt der QuelleRogez, Benoit. „Excitation électrique locale de nanostructures plasmoniques par la pointe d'un microscope à effet tunnel“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112383/document.
Der volle Inhalt der QuelleWe use a scanning tunnelling microscope (STM) to excite propagating and/or localised surface plasmons on a thin metallic film (50 nm thick) made of gold or silver deposited on a glass substrate. The leakage radiation of these STM-excited propagating surface plasmons, and the light emitted by localized plasmons into the glass substrate are collected by an inverted optical microscope equipped with an oil immersion objective. Using this setup, it is possible to image both the spatial and angular distribution of the light emitted into the glass substrate on a cooled-CCD. Sending this light to a spectrometer, it is also possible to obtain the wavelength distribution of these STM-excited plasmons. In this manuscript, we discuss the different operation modes of an STM in air. We show that the thin water layers adsorbed on both the STM tip and sample, along with the STM feedback loop, may give rise to an oscillatory mode of operation. Moreover, this mode turns out to be the most efficient one for plasmon excitation with a STM in air. We then show that, when the STM tip is used to locally excite plasmons on a gold nanowire deposited on a gold film, propagating surface plasmons may be preferentially launched along the nanowire axis. Precise understanding of this directivity allows us to demonstrate that, when deposited on a gold film, gold nanowires do not behave as Fabry-Perot resonators, but may be described quite accurately with a one dimensional antenna array model. With this model, it is thereby possible to explain the complex spatial and spectral characteristics of the STM-excited plasmons on the gold film after the addition of the nanowire. Next, we focus on the coupling between fluorescent organic nanofibres (excitonic nanostructures) and propagating surface plasmons on a metallic film (either gold or silver). We show that when the nanofibres are deposited on the metallic film, (i) their fluorescence can excite propagating surface plasmon, (ii) the nanofibre can act as a plasmonic waveguide, and (iii) it is possible to inject surface plasmons propagating onto the metallic film into the guided plasmonic modes of the nanofibre. Moreover, by studying Fourier space images, we confirmed that the vertical dipole localised under the STM tip and the STM-excited propagating surface plasmons are coherent. We finally study the coupling between individual semiconducting nanocrystals (quantum dots) and a graphene monolayer deposited on a glass substrate. We show that, when deposited on graphene, the fluorescence lifetime of the quantum dots is about 10 times shorter than for the quantum dots deposited on bare glass. This leads to a weaker fluorescence signal and reduced blinking behaviour with longer time spent into a bright state. These results improve our understanding of the STM excitation of surface plasmons. They also provide information on the coupling between plasmonic nanostructures and between plasmonic and excitonic entities. in particular, these results are a promising step toward the conception and the realisation of complex electrically driven hybrid plasmonic/excitonic nanodevices
Mathew, Sandy. „Exaltation de la réponse optique nonlinéaire du second ordre dans des nanostructures plasmoniques hybrides“. Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALY097.
Der volle Inhalt der QuelleAn ideal all photonic integrated circuit (IC) requires components that perform amplification, signal processing, logic gate operations and several equivalent functions of an electronic IC packed in to a space of few millimeters. To achieve such a feat, use of different materials adapted to different functions is inevitable. Among them, nonlinear optical materials are crucial as a potential source of single or twin-photons. However, when reducing size of a nonlinear material to nanoscale, enhancing the excitation and emission through resonant interactions becomes a prerequisite to balance the drop in nonlinear efficiency due to volume reduction. In this study, by combining nanofabrication of plasmonic and nonlinear (hybrid) structures, a versatile experimental setup and quantitative numerical simulation of both second harmonic generation (SHG) and spontaneous parametric down conversion (SPDC) second order processes, a comprehensive understanding of these nonlinear interactions and their efficiency in our systems is possible. One of the primary objectives of this work, therefore, consists in studying the origin of SHG from gold nanostructures in order to identify the dominant nonlinear source. It allows to shed some light on and discriminate between incompatible conclusions presented in the literature. Our investigation suggests that, of the three main nonlinear sources invoked in the literature, namely, parallel and normal surface source and non-local bulk source, non-local bulk and parallel surface source dominates the response while normal surface was found to be negligible contrary to most literature. A second objective of this thesis work was to achieve experimentally observable SPDC photon pair emission rate using hybrid structures which has not been possible to date. While optimising the plasmonic nanoantennas theoretically improves the photon pair rate due to resonant interaction, combining it with a material of better nonlinearity such as gallium phosphide (GaP) increases the rate to an order of magnitude higher than before. The nanowire form of GaP and the structural variations of this material, as a result, leads us to develop an experimental protocol of hybrid structure fabrication based on their distinctive SHG responses. Thus, it opens up novel possibilities for integrated nanoscale photon pair sources
Bouchon, Patrick. „Ingénierie d'indice optique à base de nanostructures métalliques“. Phd thesis, Palaiseau, Ecole polytechnique, 2011. https://pastel.hal.science/docs/00/64/20/68/PDF/Memoire_PBouchon_17112011.pdf.
Der volle Inhalt der QuellePlasmonic nanostructures are supporting plasmonic resonances which allow to confine the electromagnetic field and to govern the light behavior at a subwavelength scale. This thesis first deals with absorbing plasmonic structures. I have simulated, fabricated and characterized vertical metal / insulator / metal resonators (high aspect ratio grooves) which exhibit a total absorption in the infrared range. Besides, I have study the strong coupling regime in these resonators which led to very high quality factor. I show that it is also possible to couple several resonators to achieve photon sorting or widening of the absorption band. Furthermore, plasmonic devices are getting more and more complex, and their fast design can be achieved through a reduction of the computation time. I developed a modal method based on B-splines which allows, thanks to sparse matrices, to hasten the computations. Such methods can be used with a metaheuristic algorithm for the design of optical functions, e. G. A wide band absorber or a bandpass filte
Leroux, Yann. „Electrochimie sur surfaces nanostructurées et nanoélectrochimie : dces dispositifs plasmoniques actifs aux contacts atomiques“. Paris 7, 2007. http://www.theses.fr/2007PA077234.
Der volle Inhalt der QuelleIn this work we were interested in demonstrating some of the potentialities of electrochemistry on nanostructured surfaces in the field of plasmonics and in the realization of atomic contacts. The first chapter of this manuscript describes the creation of active plasmonic devices. It underlines how the redox properties of conducting polymers can modulate and/or commutate localized surface plasmon resonances of gold nanoparticles (network or colloidal solution). In the second part, an engraving System assisted by Atomic Force Microscopy (AFM) was developed. This technique allows the production of varied structures, on sub-micrometric and nanometric scales, for applications in the field of plasmonics and for nanoscale electrochemistry. The last part shows how electrochemistry can be used to obtain atomic contacts. The phenomenon of quantum conductance was studied on contacts obtained with copper nanowires and its variations with molecular adsorption were demonstrated. To protect the contact and to make it more stable, the use of cyclodextrins in the electrolytic growth medium appears to lead to its encapsulation and protects it against molecules interacting strongly with copper
Bouchon, Patrick. „Ingénierie d'indice optique à base de nanostructures métalliques“. Phd thesis, Ecole Polytechnique X, 2011. http://pastel.archives-ouvertes.fr/pastel-00642068.
Der volle Inhalt der QuelleNiberon, Yann. „Hyperspectral Plasmonic Biosensor for Dengue Virus Detection“. Electronic Thesis or Diss., Troyes, 2021. http://www.theses.fr/2021TROY0041.
Der volle Inhalt der QuelleSurface plasmon resonance (SPR) is a technic use to detect specific chemical binding and their evolution through time with high sensitivity and specificity. The objective of this project is to propose a compact hyperspectral SPR bio-sensor to detect Dengue virus. Based on a static system with reflection over parabolic surfaces and using white light source, in the Kretschmann configuration it was possible to realise simultaneously an angular and spectral interrogation to generate a hyperspectral image that gives us in real time a mapping of the reflectance along two axes. The real time aspect allows to study the evolution the resonance condition from the variation of the refractive index of a solution tested through time in a certain range of incident angle in the visible spectrum. A kinetic study of chemical bindings was realized with the Dengue virus Type 2 (DENV-2) with its Immunoglobulin G antibody (IgG1). During the calibration of this technic, it was reached a sensitivity to detect a refractive index shift within an order of 10-5 RUI (refractive index unit). The advantage of this SPR bio-sensor design compare to conventional system is the three-dimensional aspect (angular, spectral and temporal) to determine the resonance condition without the need to fix one of the three parameters: incident angle, wavelength and time
Eloi, Fabien. „Étude de la luminescence de nanocristaux semi-conducteurs couplés avec des structures plasmoniques à températures ambiante et cryogénique“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV117/document.
Der volle Inhalt der QuelleColloidal semiconductor nanocrystals are fluorescent nano-objects exhibiting discrete energy levels which justify their second appellation: quantum dots (QDs). Due to their high efficiency and ease of use, they find potential applications in a wide range of fields. Their usefulness for biological labeling, optoelectronic components in flat screens, light harvesting or quantum optics has been demonstrated by many studies. In this thesis, we use gold gratings in order to modify the emission properties of CdSe/CdS core-shell nanocrystals. After a brief presentation of their electronic and fluorescence properties, we explain how those properties can be modified by the control of the electromagnetic environment with particular care to the case of surface plasmons. We then show through experiment and simulations that those plasmons enable better collection efficiency, faster photo-luminescence decay rates, and polarized emission without being particularly restricting towards QD positioning. Changes in the emission statistics are also observed, notably total suppression of the blinking in the fluorescence intensity. Further experiments at low temperature have been realized in order to assess the importance of the gold ohmic losses. We investigated the case of a flat gold film as well as linear and circular gratings. A new post-selection method is also introduced and used to study the variations of the bi-excitonic quantum yield for nanocrystals embedded in a gold nano-resonator as a function of the ionization state of the emitter
Sarkar, Mitradeep. „Hybrid surface plasmon modes in metallic nanostructures : Theory, numerical analysis and application to bio-sensing“. Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS251/document.
Der volle Inhalt der QuelleThe surface plasmons on metallic surfaces are excited by the collective oscillations of free electrons. They satisfy certain resonance conditions and their dispersion can be considered as modes of the system. The plasmons at uniform metal-dielectric interfaces manifest as evanescent electromagnetic (EM) fields confined to a few hundreds of nanometers from the metallic surface and propagate along the interface. This mode is called the Propagating surface plasmon (PSP) and is a fundamental plasmonic mode. The other fundamental modes, which are non-propagative, results from collective oscillations of free electrons on curved surfaces of metallic nano-particles. They are called localized surface plasmon (LSP) modes. We have shown that the polarizability of complex geometries with an underlying substrate can be calculated analytically and the results obtained closely approximate the resonance conditions for such geometries.In this work, various other plasmonic modes originating from the two fundamental modes were studied in details and described by their corresponding analytical formulation. In a binary metallic arrays on glass substrate, plasmonic modes are excited by diffraction orders, called the Wood-Rayleigh modes (WRM). In metallic strips the PSP is confined by the finite edges of the strips and propagate along the length of the strips, called the confined propagating plasmons (CPP).For arrays of metallic nano-particles on a metallic film, the Bragg modes (BM) are excited by diffraction of the PSP. In such structures the LSP of the nano-particles and the PSP of the film can undergo a harmonic coupling to give rise to the hybrid lattice plasmon (HLP). The characteristics of the HLP mode for an array of metallic nano-cylinders on a metallic film is presented in details.The effect of the surrounding medium on the plasmonic modes is used in surface plasmon resonance (SPR) detectors which probe the shift in resonance condition of the modes. Such shift is dependent on the intrinsic dispersion of the modes. The aim of this work is to optimize the SPR detectors for affinity biosensing where probe and analyte molecules are bound to the metallic surface. We have shown that by selective functionalization of the metallic biochip surface, an enhancement of the performance of such detection can be achieved in terms of the amount of analyte used. Also the near field enhancement plays a major role in surface enhanced Raman scattering (SERS). We have shown that the presence of certain modes in the system can enhance the recorded SERS intensity.Rigorous numerical methods, adapted to the particular geometry under study, were developed to compute the near and far field characteristics of different structures. The experimental excitation of the modes and their application in SPR detection was demonstrated using a setup based on a spectral scanning modality operating in the Kretschmann configuration. The various structures were fabricated on a biochip using e-beam lithography at IEF, University Paris Sud and the reflectivity dispersion from the biochip was recorded. Such experimental results were shown to be in close agreement with the theoretical results. SERS experiments were carried out in collaboration with CSPBAT at University Paris 13 and the results were seen to fit closely the theoretically predicted trends.Such detailed description of plasmonic modes can offer a complete understanding of the surface plasmon resonance phenomenon in metallic structures and be optimized as per required for various applications. The theories presented in this work can be used to effectively describe the EM properties of different geometries and experimental configurations. From a comprehensive representation of plasmonic modes, different aspects of the photon-plasmon interactions can thus be elucidated
Abisset, Antoine. „Etude des corrélations entre les propriétés morphologiques, structurales et plasmoniques au cours de la croissance de nanoparticules d'or sur TiO2(110)“. Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY018/document.
Der volle Inhalt der QuelleThis thesis concerns the study of supported gold nanoparticles (NP) onTiO2(110) as a model system. The aim is improving the comprehension ofthe correlation between morphological and structural properties andlocal surface plasmon resonances (LSPR) of the NP.In situ measurements during NP growth were performed by grazingincidence X-ray diffraction (GIXD), grazing incidence small angle X-raydiffusion (GISAXS) and surface differential reflectance spectroscopy(SDRS). NP were deposited by molecular beam epitaxy in ultra-high vacuum.Simultaneous study of LSPR phenomena by SDRS and GISAXS allowed thedescription of resonance frequency evolution with the NP mean diameterincrease from 2 to 6 nm.Typically, position of the plasmon peak in both p and s measuredpolarizations is found to blue-shift when NP size decreases, butdetailed behavior is influenced by TiO2(110) surface state.At the same NP dimension, in one case plasmon pics position is the samefor both s and p polarization, whereas in the second studied sample theyare different, but only in the small size range (diameter<5nm). Thisphenomenon was analyzed thanks to the decomposition of plasmonexcitation into parallel (A//, contributing to both s and p signal) andperpendicular (Az, contributing only to p polarization) modes withrespect to the surface.When A// dominates (same peak positions for s and p polarizations at thesame NP mean diameter) the observed blue-shift with size decrease isvery close to that reported in literature for embedded Au NP. Thissuggests that the underlying quantum size effect, due to s-electronsspill-out and diminishing of d-electrons screening for surface atoms, isan intrinsic property of the NP. Interaction with the substrate inducesa global red-shift compared to NP in vacuum.In the other case (s /= p for sizes smaller than 5 nm), Az contributionin noticeable. Substrate influence on this mode is different, its effectincreases as size decreases, countering the intrinsic size effect.Blue-shift with size decrease is slowed down in p polarization comparedto the s one. These results were linked to GIXD measurements performedafter NP growth. They show epitaxial differences between the two studiedcases. In the former (p=s), a fair amount of NP is oriented such thatgold [110] direction is aligned with the TiO2(110) surface bridgingoxygen arrays. In the second case (p/=s), NP show a strong orientationaldisorder, possibly due to the presence of a large amount of steps on theTiO2(110) surface
Mrabti, Abdelali. „Propriétés opto-mécaniques dans des matériaux nanostructurés : couplage plasmons-phonons“. Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10201.
Der volle Inhalt der QuelleThis thesis is focused on the elastoplasmonic coupling in periodic nanostructured systems. This interaction plasmon/phonon has been studied first for a metal nanowire inserted into a cavity of a two-dimensional crystal, consisting in a periodic array of holes in a dielectric matrix. The second investigated system is a crystal with sustaining local resonances. The crystal is formed by a square array of gold nanocylindres deposited on a non-absorbing dielectric membrane. The interest of such a system is that it can support phonon modes localized in the nanocylindre enabling thus an efficient coupling with plasmon modes. The third system is a crystal constituted by a metal nanoparticles array coupled to a metal film via an ultra thin dielectric spacer (silica). The motivation behind such a study is twofold: first, plasmon modes are sensitive to small local deformations due to their strong confinement; second such a system supports many localized phonons that can provide a local amplification of vibrations. It is then a dual cavity for phonon and plasmon modes. For the three systems studied in this thesis, we have shown that mechanical vibrations can modulate during an acoustic period the wavelength of the plasmon resonance modes supported by the structure
Aoudjit, Thinhinane. „Etude des propriétés optiques de nanostructures chirales par imagerie photochimique“. Electronic Thesis or Diss., Troyes, 2022. http://www.theses.fr/2022TROY0008.
Der volle Inhalt der QuelleChiral nanostructures interact differently with right and left circularly polarized light. Moreover, they exhibit enhanced electric and magnetic near-fields leading to the so-called superchirality. This effect can be used for the detection of chiral biological objects with high enantio-sensitivity. Indeed, the optical chirality C is correlated with the rate of excitation of the chiral molecule, so that increasing the optical chirality at the location of the molecule can significantly improve its detection. We present here a subwavelength imaging approach that is based on the interaction between the highly exalted near-field of chiral nanoparticles and an azobenzene molecule (DR1, disperse red 1) grafted to a polymeric chain (i.e. PMMA). Under illumination, the azobenzene molecules (DR1) undergo photo-isomerization cycles, which induce a displacement of matter inducing measurable topographical modifications that can be tracked using atomic force microscopy. Therefore, we obtain in the polymer a map of the near-field of the chiral nanostructures. We recently demonstrated that chiral effects and field dissymmetry in plasmonic nanostructures can be imaged with this technique. Here, we apply photochemical imaging to chiral metallic nanostructures, such as chiral coupled nanorods. We show that the near-field chiral response can be imprinted in the photopolymer
Dheur, Marie-Christine. „Expériences de plasmonique quantique : dualité onde corpuscule du plasmon de surface et intrication entre un photon et un plasmon de surface“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO004/document.
Der volle Inhalt der QuelleWe present two quantum plasmonics experiments, namely quantum optics on surface plasmons. In the first experiment, we show the wave-particle duality of a single surface plasmon along the same lines as the single-photon interferences experiment of Philippe Grangier, Gérard Roger and Alain Aspect (2). In the second experiment, we bring out between a photon and a surface plasmon. We generate paires of polarization entangled photons and separate the pair photons spatially. A former photon is send to a semi-plasmonic Mach-Zehnder interferometer whose first beam splitter is a polarization beam splitter whose output are converted to plasmons and on a plasmonic beamsplitter