Дисертації з теми "Plasmoids"
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Berger, T., J. Konheiser, A. V. Anikeev, V. V. Prikhodko, P. A. Bagryansky, E. Yu Kolesnikov, E. I. Soldatkina, Yu A. Tsidulko, K. Noack, and A. A. Lizunov. "Study of high temperature and high density plasmoids in axially symmetrical magnetic fields." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-27870.
Повний текст джерелаBerger, T., J. Konheiser, A. V. Anikeev, V. V. Prikhodko, P. A. Bagryansky, E. Yu Kolesnikov, E. I. Soldatkina, Yu A. Tsidulko, K. Noack, and A. A. Lizunov. "Study of high temperature and high density plasmoids in axially symmetrical magnetic fields." Forschungszentrum Dresden-Rossendorf, 2009. https://hzdr.qucosa.de/id/qucosa%3A21614.
Повний текст джерелаGranier, Camille. "Nouveaux développements sur la théorie des instabilités des feuilles de courant dans les plasmas non-collisionels." Electronic Thesis or Diss., Université Côte d'Azur, 2022. http://www.theses.fr/2022COAZ4109.
Повний текст джерелаMagnetic reconnection is a change of topology of the magnetic field, responsible for explosive release of magnetic energy in astrophysical plasmas, as in the case of magnetospheric substorms and coronal mass ejections, as well as in laboratory plasmas, which is the case of sawtooth crashes in tokamaks. In collisionless plasmas as, for instance, the magnetosphere and the solar wind, electron inertia becomes particularly relevant to drive reconnection at regions of intense localized current, denoted as current sheets. In these non-collisional environments, the temperature can often be anisotropic and effects at the electron scale on the reconnection process can become non-negligible.In this thesis, the stability of two-dimensional current sheets, with respect to reconnecting perturbations, in collisionless plasmas with a strong guide field is analysed on the basis of gyrofluid models assuming cold ions. These models can take into account an equilibrium temperature anisotropy,and a finite βe, a parameter corresponding to the ratio between equilibrium electron kinetic pressure and magnetic pressure.We derive and analyze a dispersion relation for the growth rate of collisionless tearing modes accounting for equilibrium electron temperature anisotropy. The analytical predictions are tested against numerical simulations, showing a very good quantitative agreement.In the isotropic case, accounting for finite βe effects, we observe a stabilization of the tearing growth rate when electron finite Larmor radius effects become relevant. In the nonlinear phase, stall phases and faster than exponential phases are observed, similarly to what occurs in the presence of ion finite Larmor radius effects.We also investigate the marginal stability conditions of secondary current sheets, for the development of plasmoids, in collisionless plasmas. In the isotropic βe → 0 regime, we analyze the geometry that characterizes the reconnecting current sheet, and identify the conditions for which it is plasmoid unstable. Our study shows that plasmoids can be obtained, in this context, from current sheets with an aspect ratio much smaller than in the collisional regime. Furthermore, we investigate the plasmoid formation comparing gyrofluid and gyrokinetic simulations.This made it possible to show that the effect of finite βe, promotes the plasmoid instability. Finally, we study the impact of the closure applied on the moments, performed during the derivation of the gyrofluid model, on the distribution and conversion of energy during reconnection
La riconnessione magnetica è un cambiamento nella topologia delcampo magnetico, responsabile del rilascio esplosivo di energia magnetica nei plasmiastrofisici, come nelle tempeste magnetosferiche e nelle espulsioni di massa coronale,nonché nei plasmi di laboratorio, come nel caso delle oscillazioni a dente di sega neitokamak. Nei plasmi non-collisionali come, ad esempio, la magnetosfera e il vento solare,l’inerzia elettronica diventa particolarmente efficace nel causare la riconnessionein regioni di corrente intensa e localizzata, detti strati di corrente. In tali plasmi noncollisionali,la temperatura può essere spesso anisotropa e gli effetti su scala elettronicasul processo di riconnessione possono diventare non trascurabili.In questa tesi, viene analizzata la stabilità di strati di corrente bidimensionali inplasmi non-collisionali con un forte campo guida, sulla base di modelli girofluidi cheassumono ioni freddi. Questi modelli possono tenere conto di un’anisotropia di temperaturadi equilibrio e di un βe finito. Quest’ultimo è un parametro corrispondente alrapporto tra la pressione cinetica elettronica di equilibrio e la pressione magnetica.Deriviamo e analizziamo una relazione di dispersione per il tasso di crescita dei moditearing non-collisionali tenendo conto dell’anisotropia della temperatura di equilibriodegli elettroni. Le previsioni analitiche sono verificate mediante simulazioni numeriche,che mostrano un ottimo accordo quantitativo. Nel caso isotropico, tenendoconto degli effetti di βe finito, si osserva una stabilizzazione del tasso di crescita delmodo tearing quando diventano rilevanti gli effetti del raggio finito di Larmor deglielettroni. Nella fase non lineare si osservano fasi di decelerazione e fasi di accelerazione,simili a quanto avviene in presenza di effetti del raggio di Larmor finito ionico.Studiamo anche le condizioni di stabilità marginale degli strati di corrente secondaria,per lo sviluppo di plasmoidi, in plasmi senza collisioni. Nel regime isotropicocon βe → 0, analizziamo la geometria che caratterizza lo strato di corrente e identifichiamole condizioni in cui esso diventa instabile a causa di un’instabilità che generaplasmoidi. Il nostro studio mostra che i plasmoidi possono essere ottenuti, in questocontesto, da strati di corrente aventi un rapporto d’aspetto molto più piccolo rispettoal regime collisionale. Inoltre, studiamo la formazione di plasmoidi confrontando simulazionigirofluidi e girocinetiche. Ciò ha permesso di dimostrare che l’effetto di βe promuove l’instabilità che genera plasmoidi. Infine, si studia l’impatto della chiusuraapplicata ai momenti, eseguita durante la derivazione del modello girofluido, sulla distribuzionee conversione dell’energia durante la riconnessione
Hörbe, Mario Robert [Verfasser], Julia [Gutachter] Tjus, and Garret [Gutachter] Cotter. "High-energy particle emission from plasmoids in jets of active galactic nuclei / Mario Robert Hörbe ; Gutachter: Julia Tjus, Garret Cotter ; Fakultät für Physik und Astronomie." Bochum : Ruhr-Universität Bochum, 2020. http://d-nb.info/1233484176/34.
Повний текст джерелаLin, Ling. "Optical Manipulation Using Planar/Patterned Metallo-dielectric Multilayer Structures." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/1249.
Повний текст джерелаKurth, Martin L. "Plasmonic nanofocusing and guiding structures for nano-optical sensor technology." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/118670/1/Martin_Kurth_Thesis.pdf.
Повний текст джерелаConstant, Thomas J. "Optical excitation of surface plasmon polaritons on novel bigratings." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/9001.
Повний текст джерелаLoiselet, Ophelliam. "Synthèse et caractérisation d’agrégats bimétalliques pour la magnéto-plasmonique." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1033/document.
Повний текст джерелаFor 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
Nagaraj, Nagaraj. "Effects of Dissipation on Propagation of Surface Electromagnetic and Acoustic Waves." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc115126/.
Повний текст джерелаHettiarachchige, Chamanei Sandamali P. "The interaction of quantum dots with plasmons supported by metal waveguides." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/92278/1/Chamanei%20Sandamali_Hettiarachchige_Thesis.pdf.
Повний текст джерелаElKabbash, Mohamed. "ACTIVE PLASMONICS AND METAMATERIALS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1512659080056302.
Повний текст джерелаVogel, Michael Werner. "Theoretical and numerical investigation of plasmon nanofocusing in metallic tapered rods and grooves." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/29241/1/Michael_Vogel_Citation.pdf.
Повний текст джерелаVogel, Michael Werner. "Theoretical and numerical investigation of plasmon nanofocusing in metallic tapered rods and grooves." Queensland University of Technology, 2009. http://eprints.qut.edu.au/29241/.
Повний текст джерелаDubrovina, Natalia. "Metamaterials for photonic applications." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112088/document.
Повний текст джерелаThe subject of the PhD thesis deals with metamaterials for photonic applications. The main objective is to investigate the potential of metallic metamaterials for building optical functions at NIR optical frequencies. A significant part of the work is focused on the engineering of the metamaterials effective index associated with localized plasmon resonances. Two configurations of particular importance for fabrication technology are considered:• Free space light propagation, with the incident electromagnetic wave interacting with single metafilms at either normal or oblique incidence. • Guided wave configuration, with single metamaterial layer placed on top of dielectric waveguide.For the free space configuration, the validity of the effective medium approach was investigated both numerically and experimentally with the example of metamaterials composed of either gold cut wires or split ring resonators and continuous wires on silicon substrate. On the basis of these examples it was shown that the metafilm behavior is indeed analogous to that of a homogeneous layer. The thickness of this layer is that of the deposited metal. The validity of this conclusion was verified with respect to a number of criteria consistent with the Maxwell-Garnett approximation. It was shown in particular that near the resonance frequency the effective index of the metafilm layer can reach very high values neff=10 that cannot be attained with natural materials.The effective medium approach developed for a single metamaterial layer in free space configuration was further extended to a guided wave configuration. The objective is to achieve an efficient control over the flow of light in the waveguide using effective index variations induced by metamatarial resonances. The possibility of achieving a significant effective index variation with a silicon slab waveguide covered by 200X50X50nm cut wires was investigated by numerical modeling and confirmed by experimental results. The magnitude of local index variation in the vicinity of the resonance frequency deduced from experimental data is as high as ±1.5. The possibility for controlling the local effective index at the nanoscale can be used in transformation optics applications. The hybrid metamaterial guided wave configuration may become a promising alternative to the bulk multi-layers metamaterial structures in the near infrared domain
Sönnichsen, Carsten. "Plasmons in metal nanostructures." [S.l.] : [s.n.], 2001. http://edoc.ub.uni-muenchen.de/archive/00002367.
Повний текст джерелаSönnichsen, Carsten. "Plasmons in metal nanostructures." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-23678.
Повний текст джерелаKadic, Muamer. "Metamaterials for surface plasmons." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30026.
Повний текст джерелаThe work which has been presented in this thesis includes differentappealing subjects of optics such as metamaterials, transformationaloptics, photonic crystals, negative refraction and thermo-plasmonicinteractions. In this manuscript we have developed several metamaterialsfor Surface Plasmon Polaritons based on the transformational optics.Firstly we have demonstrated theoretically, numerically andexperimentally some SPP cloaking devices. Secondly, we havedemonstrated SPP negative refraction using the concept of space foldingthen with some dielectric metamaterial, flat and anisotropic SPP lenses.Additionaly we have demonstrated that subwavelength checkerboardstructured thick gold films have demonstrated an extra-ordinarytransmission over the visble range of frequencies.Finally, we have investigated a general multiphysics problem to mix opticsand thermally induced effects. We have been able to show that playingwith the amplitude of an electromagnetic wave or a pulse, we can inducea gradient of temperature and control heat of a plasmonic device
Burnett, Mathew T. "Microspectroscopy of localised plasmons." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516954.
Повний текст джерелаTurek, Vladimir. "Plasmonics at liquid-liquid interfaces." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/38445.
Повний текст джерелаKaube, Benjamin. "Plasmonics : from electrons to devices." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/58997.
Повний текст джерелаPeng, Cheng S. M. Massachusetts Institute of Technology. "Towards infrared plasmonics in graphene." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101585.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 59-64).
Graphene plasmons have recently been proposed as an alternative to noble-metal plasmons in the field of photonics, due to its extremely tight light confinement, relatively long-lived collective oscillation, and high tunability via electrostatic gating. Successful support and tuning of graphene plasmonic modes rely on controllable doping of graphene to high carrier densities in nanometer-scale structures. In this thesis, an experimental approach to generating nanoscale spatial carrier density modulation of graphene using electrolyte gates and crosslinked-PMMA screen is proposed and investigated. The increased optical absorption in the infrared region due to plasmon resonances induced by the proposed scheme is numerically studied. We then present the fabrication technique of the proposed scheme for various nanostructure geometries. Finally, we provide an outlook of future studies of graphene plasmonics, including plasmon excitation with solid-state cavity quantum electrodynamics (QED).
by Cheng Peng.
S.M.
Khlopin, Dmitry. "Aluminum plasmonics for optical applications." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0034.
Повний текст джерелаPlasmonics is based on the intense and confined electromagnetic fields appearing near metallic nanostructures illuminated at frequencies near their surface plasmon resonances. Among the different metals, aluminum sustains a broad range of plasmonic resonances from deep UV to near IR. Due to high losses in the visible, aluminum plasmonic structures require an improvement to compete with noble metals. First, we present a strategy to increase the resonance quality based on diffractive coupling in periodic arrays. This approach, studied with simulations and experimental methods, provides a change of quality factor of resonance up to 7 times in comparison with an isolated particle. Then, we couple aluminum nanostructures with a wide band gap semiconductor to enhance its emission. Periodic arrays of Al nanoparticles were fabricated onto a ZnO epitaxial layer. Results show an enhancement of emission of 1.5 times in comparison with pristine ZnO. To increase the effect and get a more efficient surface coverage, we then used a fractal geometry inspired from radiowave technology. FDTD simulations were performed to design an effective geometry and the structures were fabricated with an adapted electron beam lithography process. Finally, we propose a concept of chiral fractals. Using the complex geometry of fractals, it is possible to push optical chirality of plasmonic structures toward the UV part of the spectrum. Samples were fabricated and the existence of circular dichroism in fractal structures was proven
Ansell, Daniel. "Graphene for enhanced metal plasmonics." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/graphene-for-enhanced-metal-plasmonics(7bb0ffb1-f46f-498e-bb88-9626021f6f58).html.
Повний текст джерелаLuo, Yu. "Transformation optics applied to plasmonics." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/10521.
Повний текст джерелаLIN, LYUYE. "Plasmonics in Metal Insulator Cavities." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1071822.
Повний текст джерелаÉdes, Zoltán. "Fotoluminiscence zesílená plazmonovými polaritony." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230270.
Повний текст джерелаDELANNEE, CECILE. "Contribution a l'etude des plasmoides de la couronne solaire." Paris 6, 1997. http://www.theses.fr/1997PA066296.
Повний текст джерелаJory, Michael John. "Optical sensing with surface plasmons." Thesis, University of Exeter, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240308.
Повний текст джерелаAger, C. D. "Plasmons in microstructured semiconductor 2DEGs." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385904.
Повний текст джерелаJain, Prashant K. "Plasmons in assembled metal nanostructures." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28207.
Повний текст джерелаCommittee Chair: El-Sayed, Mostafa A.; Committee Member: Lyon, L. Andrew; Committee Member: Sherrill, C. David; Committee Member: Wang, Zhong Lin; Committee Member: Whetten, Robert L.
Héron, Sébastien. "Nanostructures pour l'exaltation d'effets non linéaires." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX082/document.
Повний текст джерелаInfrared 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
Lei, Dang-Yuan. "Superfocusing, biosensing and modulation in plasmonics." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9046.
Повний текст джерелаIyer, Srinivasan. "Effects of surface plasmons in subwavelength metallic structures." Doctoral thesis, KTH, Optik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103613.
Повний текст джерелаQC 20121017
Hugall, James T. "On the nature of SERS from plasmonic nanostructures." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/267496.
Повний текст джерелаOtomalo, Tadele. "Ultrafast optical response of complex plasmonic nanoparticles." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC102.
Повний текст джерелаThe remarkable properties associated with the localized plasmon resonance (LSPR) in noble metal nanoparticles (NPs) make plasmonics an important topic with multiple applications. When NPs are illuminated by ultrashort laser pulses they undergo a rapid dynamics of energy exchanges which leads to the ultrafast variation of their optical properties, associated with other effects such as broadband photoluminescence, hyperlocalized heat release, electron photoemission, production of reactive oxygen species and nano-cavitation. The design of complex hybrid nanostructures can enable us to tailor the plasmonic properties as to optimize the applications. We have studied some hybrid nanostructures by broadband pump-probe absorption spectroscopy and a dedicated modeling: AuNP-decorated silica fibers and core-shell Au-Ag NPs. Their stationary and transient optical responses are analyzed depending on the NP morphology.In the developments evoked above the enhanced near field around plasmonic NPs plays a key role. However, the study of the ultrafast transient modulation of the near field is limited by the inability of the conventional numerical tools to catch the small variations of the NP permittivity. Here, a complex-conjugate pole-residue pair based FDTD method is successfully implemented to simulate the time-dependence of the plasmonic near-field topography. Beyond, the LSPR mode can be resonantly coupled with a photonic mode in a hybrid microcavity for conceiving optically-controlled photonic functionalities. The coupling of a 2D array of parallel gold nanorods with the defect mode of a 1D photonic crystal cavity is investigated theoretically. The optical anisotropy enables us to play with several degrees of freedom like field polarization. The ultrafast modulation of the optical response that is predicted in such hybrid nanostructures opens the possibility of their future optimization for designing time-resolved sensors
Scales, Christine. "Magneto-plasmons in optical slab waveguides." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26765.
Повний текст джерелаMarques, Antonio Neudson Lima. "Teoria diagramÃtica para plasmons em semicondutores." Universidade Federal do CearÃ, 2004. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4066.
Повний текст джерелаCoordenaÃÃo de AperfeiÃoamento de NÃvel Superior
O cÃlculo da luminescÃncia em um semicondutor de gap direto à feito por dois mÃtodos e, sÃo realizadas comparaÃÃes dos resultados teÃricos obtidos. No primeiro caso, o mÃtodo das funÃÃes de Green à utilizado e a interaÃÃo coulombiana entre o sistema elÃtron-buraco que compÃe o plasma, à tratada atravÃs da AproximaÃÃo de Fases AleatÃrias. Como resultado importante obtemos a funÃÃoo dielÃtrica, com a qual podemos associar a resposta Ãptica do sistema Ãs excitaÃÃes externas. No segundo caso, usamos a teoria diagramÃtica para obter a relaÃÃo de dispersÃo para o semicondutor de gap direto.
Lereu, Aude L. "Couplages assistés par plasmons de surface." Dijon, 2005. http://www.theses.fr/2005DIJOS053.
Повний текст джерелаKociak, Mathieu. "Supraconductivite et plasmons dans les nanotubes." Phd thesis, Paris 11, 2001. http://www.theses.fr/2001PA112101.
Повний текст джерелаMoazzezi, Mojtaba. "Quantum Coherence Effects Coupled via Plasmons." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404550/.
Повний текст джерелаBhatta, Hari Lal. "UV Magnetic Plasmons in Cobalt Nanoparticles." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505221/.
Повний текст джерелаVernon, Kristy C. "Strongly localised plasmons in metallic nanostructures." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/19318/2/Kristy_Vernon_Citation.pdf.
Повний текст джерелаVernon, Kristy C. "Strongly localised plasmons in metallic nanostructures." Queensland University of Technology, 2008. http://eprints.qut.edu.au/19318/.
Повний текст джерелаRolly, Brice. "Subwavelength photonic resonators for enhancing light-matter interactions." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4366.
Повний текст джерелаOptical 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)
Ameling, Ralf [Verfasser], and Harald [Akademischer Betreuer] Giessen. "Microcavity plasmonics / Ralf Ameling. Betreuer: Harald Giessen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2011. http://d-nb.info/1014785200/34.
Повний текст джерелаHamza, Taha Mohamed. "Doped ZnO nanostructures for Mid Infrared plasmonics." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC051/document.
Повний текст джерелаThe scope of this thesis is about developing SEIRA (surface enhanced IR absorption) platform to probe low volumes of environmental gases that possess molecular signature from 3.3 μm to 5.1 μm leveraging the high field amplification of localised surface plasmon resonance (LSPR). To realise SEIRA, we demonstrated tuning MIR LSPR in Al or Ga doped ZnO nanocrystals (NCs) as well as in GZO or core-shell (ZnO/GZO) nanowires (NWs). Regarding tuning MIR LSPR in NCs, we demonstrated tunable MIR LSPR in Ga and Al doped ZnO NCs from 3 to 5 μm varying the Al or Ga content from 3 to 9 at.%. The incorporation of dopant was homogeneous up to 6%. At 9% dopant concentration, the incorporation was inhomogeneous, revealing the solubility limit has been reached. However, the NCs exhibited low activation of impurities. The activation was as low as 8%. The LSPR were characterised by large broadening as well. In order to enhance the dopant activation, we synthesized the NCs in O-poor conditions as well as passivated the NCs fabricated in O-rich condictions (by isolating and embedding them in matrices such as Al2O3 and SiO2 matrices). Both strategies improved the dopant activation from 8% up to 20%. Moreover, for assemblies of NCs dispersed in matrices, the broadening (FWHM) of the LSPR was reduced by half (from 2200 cm-1 in as-deposited NCs to 1100 cm-1 in embedded NCs). Correspondingly, the effect of the self-assembly of the nanocrystals on their LSPR was modeled by FDTD simulation and provided hindsight into the mechanisms responsible for the heterogeneous broadening of the LSPR. Finally, we have studied Ga-doped ZnO (GZO) and core-shell (ZnO/GZO) NW synthesized by MOCVD. The first important conclusion is that Ga plays a major surfactant role during the MOCVD growth of GZO. Instead of leading to hexagonal NWs, the introduction of Ga during the synthesis led to faceted “Christmas-tree” like architectures. The same observation held for core-shell ZnO-GZO nanowires; in the latter case, the GZO shell resulted in a dewetting branched architecture. Regarding their optical properties, photo-acoustic FTIR measurements revealed an absorption feature related to the Ga content, likely to be assigned to a plasmonic effect. This resonance could be tuned from 1600 to 1900 cm
Steuwe, Christian. "Nonlinear photonics in biomedical imaging and plasmonics." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708016.
Повний текст джерелаCantono, Giada. "Relativistic Plasmonics for Ultra-Short Radiation Sources." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS353/document.
Повний текст джерелаPlasmonics studies how the electromagnetic radiation couples with the collective oscillations of the electrons within a medium. Surface plasmons (SPs), in particular, have a well-established role in the development of forefront photonic devices, as they allow for strong enhancement of the local EM field over sub-micrometric dimensions. Promoting the SP excitation to the high-field regime, where the electrons quiver at relativistic velocities, would open stimulating perspectives for the both the manipulation of ultra-intense laser light and the development of energetic, short radiation sources. Indeed, the excitation of resonant plasma modes is a possible strategy to efficiently deliver the energy of a high-power laser to a solid target, this being among the current challenges in the physics of highly-intense laser-matter interaction. Gathering these topics, this thesis demonstrates the opportunity of resonant surface plasmon excitation at ultra-high laser intensities by studying how such waves accelerate bunches of relativistic electrons along the target surface and how they enhance the generation of high-order harmonics of the laser frequency. Both these processes have been investigated with numerous experiments and extensive numerical simulations. Adopting a standard configuration from classical plasmonics, SPs are excited on solid, wavelength-scale grating targets. In their presence, both electron and harmonic emissions exhibit remarkable features that support the conception of practical applications. Putting aside some major technical and conceptual issues discouraging the applicability of plasmonic effects in the high-field regime, these results are expected to mark new promises to the exploration of Relativistic Plasmonics
TORRE, IACOPO. "Hydrodynamics and plasmonics in two-dimensional materials." Doctoral thesis, Scuola Normale Superiore, 2018. http://hdl.handle.net/11384/85904.
Повний текст джерелаBeránek, Jiří. "Povrchové plazmonové rezonance na koloidních nanočásticích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230613.
Повний текст джерела