Literatura científica selecionada sobre o tema "Nanoantenne plasmonique"
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Teses / dissertações sobre o assunto "Nanoantenne plasmonique"
Esparza, Villa Juan Uriel. "Fabrication et caractérisation d'antennes patch plasmoniques". Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS088.
Texto completo da fonteIn this thesis, we exploit light-matter interaction between a single semiconductor CdSe/CdS nanocrystal and a plasmonic patch antenna. This work can be divided in two main parts. We have first characterized the photoluminescence dynamics and spectroscopic signatures of single nanocrystals at different excitation powers. High quality CdSe/CdS nanocrystals are single-photon sources at room temperature. Nevertheless, multiexcitonic emission occurs when two or more excitons are recombining radiatively. We have developed an analytical model which describes the number of photons emitted by a nanocrystal as a function of the mean number of excitons created in one excitation pulse. With this model, we can calculate the quantum efficiency of the bi-exciton recombination. The second part is devoted to the development and optimization of an optical lithography protocol for patch antennas. We have stablished a protocol that allows us to couple a thin Au nano-disk above a single nanocrystal in a deterministic way. We have first fabricated passive nanoantennas in order to study reflectivity spectroscopic properties in the plasmonic structure. Later on, we have fabricated several active patch nanoantennas coupled with single CdSe/CdS nanocrystals. We have demonstrated the acceleration of spontaneous emission thanks to the coupling with the plasmons nanodisk. For some antennas, we have evidenced a super-poissonian emission signature when a post-processing temporal filter is applied. Finally, we have evidenced the emission of light partially coherent of one antenna in the proximity of the metallic square edge
Dileseigres, Angeline. "Diarylethenes used as molecular switches for the connection of gold nanoparticles". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS014.
Texto completo da fonteDiarylethene molecules used as molecular switches are envisioned as components of molecular electronic devices. These photochromic molecules exhibit high thermal stability, resistance to fatigue, and switching efficiency. Nevertheless, the switching of most diarylethenes (DAEs) is asymmetric: their photocycloreversion reaction possessing a much lower quantum yield than that of their photocyclization reaction. A strategy to solve that asymmetric switching issue was tested, it consisted in connecting the diarylethene molecules to gold nanoparticles (AuNPs). Indeed, gold nanoparticles exhibit both a localized surface plasmon resonance (LSPR), very useful for the monitoring of the adsorption of the DAEs at the surface of the AuNPs, and a plasmonic nanoantenna effect. This nanoantenna effect, generating a large enhancement of the electromagnetic field in the close vicinity of the nanoparticle, was expected to increase the efficiency of the photocycloreversion reaction (its quantum yield), leading to a more symmetric switching. The switching of the dithienylethene (DTE) molecules was first characterized for the molecules alone in solution. Then, the functionalization of 28 nm gold nanoparticles deposited on ITO by the DTE molecules was monitored in situ by UV-visible spectroscopy. Switching measurement on the samples ITO/AuNPs/DTE were performed by UV-visible spectroscopy combined with an irradiation set-up. It resulted that for the diarylethene molecules chosen for this study connected to 28 nm AuNPs, although the switching capacity was preserved upon grafting on the AuNPs, the quenching was largely dominant. As a consequence, a slowing of the photo-induced reactions was caused and not an acceleration. Gold nanoparticles were also studied at the unique nanoparticle scale by AFM and hypermicroscopy (dark field microscopy coupled to UV-visible spectroscopy). On the one hand, the functionalization of individual 51 nm gold nanoparticles was monitored by hypermicroscopy. Switching measurements were then conducted on the diarylethenes molecules beard by single AuNPs, revealing that this switching was comparable to the one previously measured on a more global scale. On the other hand, asymmetric plasmonic dimers made of a 51 nm AuNP and a 28 nm AuNP were prepared and characterized
Bigourdan, Florian. "Nanoantennes plasmoniques". Thesis, Palaiseau, Institut d'optique théorique et appliquée, 2014. http://www.theses.fr/2014IOTA0020/document.
Texto completo da fonteThe work of this thesis has been devoted to a few applications of antenna concepts for the manipulation of light. In the optical range, surface modes called surface plasmon polaritons take place in the vicinity of metallic antennas, enabling a strong light/matter interaction within highly confined volumes. In order to take advantage of this property, three applications of plasmonic antennas will be investigated. First, in the case of single-photon sources, both theoretical and experimental studies of single-emitters performance when coupled to a planar metallic antenna will be presented. A strategy to enhance its performance will be studied theoretically. Then, in the case of electrical generation of light by inelastic electron tunneling, we will analyse the modification of radiation properties close to a metallic nano-rod. This analysis paves the way towards the design of integrated, compact electrical sources of surface plasmons. Finally, in the case of detecting a weak quantity of molecules, the interaction between an infrared light beam and a sub-nanometric layer of resonant molecules deposited on a nanostructured metallic mirror will be studied
Cui, Lingfei. "Antennes photoniques pour amplifier les interactions entre la lumière et la matière chirale". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS392.
Texto completo da fonteThe detection of molecules based on fluorescence or Raman scattering has been widely studied and is currently used in industry and laboratories. However, many organic molecules of interest are chiral, and their chemical and biological properties depend on their enantiomer as well as on the chirality of their secondary structure. The quantity and chirality of biomolecules are classically determined by measuring the differential absorption between the two opposite circular polarizations (chiroptic method). However, this method is limited by the low differential absorption of chiral molecules, which is of the order of 10-3 in the UV part of the spectrum. Plasmonic resonators have the ability to resonantly interact with light and are characterized by a moderate quality factor and a low effective volume. This resonant interaction allows (i) to increase the coupling between molecules and light and (ii) to control the polarization properties of light. So far, the latest advances concern the implementation of nanostructured chiral surfaces with gammadion-type resonators or stacked twisted resonators that interact preferentially with a given helicity of light. However, the mechanism behind the differential response of biomolecules coupled to chiral resonators to circularly polarized light is still unclear, preventing the optimization of such detection. Moreover, in the research published so far, two different chiral sensors are needed to interact with right- and left-handed circularly polarized light, which requires complex calibration procedures. During the course of my PhD, I have studied the use of anisotropic achiral nanostructures to interact with chiral molecules. Indeed, they have the significant advantage over chiral nanostructures of changing the sign of the circular dichroism by controlling the incident polarization or the direction of propagation. Indeed, the symmetries of the electromagnetic field in close proximity to the resonators can be manipulated at will by changing illumination conditions hence providing a unique tool for studying the origin of the electromagnetic coupling between chiral biomolecule and nanoresonators. Consequently, in my PhD project I propose to use plasmonic nanoresonators to increase the light - “chiral matter” interactions in order to detect and study chiral molecules. I will use the concept of achiral plasmonic nanostructures (nanoslits) to develop innovative nanoresonators that will be used, once functionalized, to detect chiral biomolecules with enantiomer sensitivity. Indeed, achiral resonators can generate both signs of chiral fields as opposed to chiral resonators which would make their use very flexible. This work implies characterizing, describing and understanding the origins of chiral fields and how to make them homogeneous. Through the study of nanoslits, I demonstrate numerically and theoretically how to design a nanosource of pure superchiral light, free of any background and for which the sign of the chirality is tunable on-demand in wavelength and polarization. In the perspective, I will present experimental methods that could monitor the CD via fluorescence emission (FDCD for Fluorescence Detected Circular Dichroism) in the case of light harvesting molecules for molecules that need to be excited in the UV, autofluorescence may be used in conjunction with aluminum resonators. Without loss of generality, these considerations lead to the decision of investigating plasmonic resonators with resonance at 680 nm which correspond to the chiral absorption band of LHCII. The idea of blocking the excitation beam to collect only the emission of the chiral molecules leaded to the idea of investigating the resonances of openings in an opaque layer of gold
Al-Aridhee, Tahseen. "Numerical study of optical properties of single and periodic nanostructures : from nanoantennas to enhanced transmission metamaterials". Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2004/document.
Texto completo da fonteThe release of the rst report by Faraday in 1857 set the foundation of the production of metal nanoparticlesand their unexpected optical properties (coloring). More recently, controlling and guiding light via plasmonicresonance in nanostructures enable a lot of applications affecting everyday life that involves light. Plasmonresonance of metallic structures is a key phenomenon that allows unique optical properties through the interactionof light with the free electrons of the metal. The excitation of Localized Surface Plasmon Resonance(LSPR) leads to turn-on large local enhancements of electromagnetic energy as within antennas or to routelight as waveguide to desired region with high transmission through the excitation of Propagating SurfacePlasmon (PSP). During this thesis, we have developed an existing algorithm in order to calculate the opticalresponse of NPs of any shape. We have especially determined the localized energy enhancement factor interm of optical response of nano-antenna. This anisotropic (polarization dependent) NPs type can feature, atplasmon resonance, scattering efciency factor higher than 25. Moreover, an important systematic study hasbeen performed in order to optimize design of such NPs.Concerning the PSP that are involved in the enhanced transmission through Annular Aperture Arrays (AAAs),we systematically study the properties of the excitation of the peculiar Transverse ElectroMagnetic (TEM) guidedmode inside such nano-apertures. A complete numerical study is performed to correctly design the structurebefore it is experimentally characterized. For reasons associated to fabrication constraints and efciency,a slanted AAA made in perfectly conducting metal is proposed and studied. We numerically and analyticallydemonstrate some intrinsic properties of the structure showing a transmission coefcient of at least 50%ofan un-polarized incident beam independently of the illumination configuration (polarization, angle, and planeof incidence). At the TEM peak transmission, the laminar flow of the energy through the structure can exhibitgiant deviation over very small distances ( ). The results presented in this thesis could be considered as animportant contribution to the understanding of the enhanced transmission phenomenon based on the excitationof guided modes
Rolly, Brice. "Subwavelength photonic resonators for enhancing light-matter interactions". Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4366.
Texto completo da fonteOptical antennas are structures able to convert, in both ways, electromagnetic energy between a light beam and a source (or absorber) placed in the structure. The use of sub-wavelength resonators enables one to realize this function in an efficient way, on relatively broad bandwidths, and to have a compact design. A good understanding of the optical properties of such resonators, taken individually, and of their couplings, is thus necessary in order to propose efficient optical antenna designs. In this manuscript, using a multipole decomposition of the fields and a T-matrix method, we obtain rigorous analytical solutions for spherical, homogeneous resonators, from which we deduce simplified, intuitive models that are still very close to the exact resolution of the Maxwell equations.Among other results, those models enabled us to propose a nanoantenna design that is at once compact, radiative and efficient, by using a hybrid metallo-dielectric structure. Some collaborations with experimental groups enabled us to validate, on the one hand, the optical characteristics of hybrid chromophores that are self-assembled using a DNA template (S. Bidault, Paris), and on the other hand, the possibility of using multiple combined electric and magnetic resonances (supported by dielectric spheres of moderate refractive index, n=2.45) in order to reflect, or more importantly collect, radiation coming from an electric dipole emitter placed nearby (the experiment was realized in the microwave regime by R. Abdeddaim and J-M. Geffrin)
Habert, Benjamin. "Contrôle de la fluorescence par des nanoantennes plasmoniques". Phd thesis, Palaiseau, Institut d'optique théorique et appliquée, 2014. http://pastel.archives-ouvertes.fr/pastel-01023199.
Texto completo da fonteDuperron, Matthieu. "Conception et caractérisation de nanoantennes plasmoniques pour la photodétection infrarouge refroidie". Thesis, Troyes, 2013. http://www.theses.fr/2013TROY0030/document.
Texto completo da fonteThe market for cooled infrared imaging technologies is growing fast due to a range of applications covering military, commercial and space. Current research for innovative systems focuses on high operating temperature and multispectral detectors.To achieve these aims, optical resonators can be used to concentrate electromagnetic fields in thin absorbing media. This thesis investigates the possibility of using plasmonic resonators for HgCdTe photodetection.Temporal coupled-mode theory is used to optimise analytically the absorption in a plasmonic resonator incorporating an absorbing semiconductor subject to the critical coupling condition. A design of a thin plasmonic HgCdTe diode is then described. This includes a hybrid plasmonic mode arising from the coupling between a surface plasmon and a cavity gap-plasmon mode
Torres, Garcia Juan de. "Nanophotonic control of Förster resonance energy transfer". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4354.
Texto completo da fonteThe technique of Förster resonance energy transfer (FRET) determines the separation between two molecules at the nanometer scale, where molecular interactions can take place. The phenomenon requires a donor fluorophore transferring its energy in a non-radiative way, through a near-field dipole-dipole interaction, to an acceptor. Nanophotonics achieves accurate control over these interactions by modifying the local density of optical states (LDOS) of a single quantum emitter. We have clearly demonstrated enhanced energy transfer within single FRET pairs confined in single nanoapertures made of gold and also aluminum or in more complex structures like the antenna-in-box design. In particular, we have revealed the strong influence of the mutual dipole orientation on the FRET enhancement using nanostructures. Also, by means of silver nanowires, we have demonstrated a long-range plasmon-mediated fluorescence energy transfer between two nanoparticles separated by micrometer distance. Our results are clearing a new path to improve the energy transfer process widely used in life sciences and biotechnology. Optical nanostructures open up many potential applications for biosensors, light sources or photovoltaics
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.
Texto completo da fonteThe 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