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1	Near-field spectroscopy of semiconductor device structures and plasmonic crystals Malyarchuk, Viktor 31 August 2004 (has links) Wir erforschen r?umlich Modenprofile in Wellenleitern mit Submikrometerabmessungen. Daf?r wird die optische Nahfeldmikroskopie in Kombination mit durchstimmbaren Laseranregungsquellen eingesetzt. Wir zeigen, wie das Nano-Photolumineszenzsignal von den Facetten von Quantentroglasern benutzt werden kann, um in diesem Bereich Oberfl?chenrekombination und Diffusionsl?ngeunabh?ngig voneinander zu bestimmen. Damit werden wichtige Informationen ?ber Haftstellen und deren Konzentration an Bauelementeoberfl?chen gewonnen. Eigenmoden in quasi-2-dimensionalen plasmonischen Kristallen sowie ihre Bandstruktur werden direkt gemessen und abgebildet. Messungen der Relaxation der Oberfl?chenplasmonanregung in der Raum- und Zeitdom?ne erlauben die Aufkl?rungder mikroskopischen Natur der Oberfl?chenplasmonemission. / Methods of the near-field spectroscopy combined with tunable laser excitation was used in order to perform investigation of the modeprofiles of submicron-sized waveguides in semiconductor device lasers. It was shown that the nano-photoluminescence signal at facets of a quantum well laser can be used to obtain surface recombination velocity and diffusion length independently and provide important information about concentration of trap-like defect states. Eigenmodes of the quasi-two-dimensional plasmonic crystals as well as their dispersion relations were directly mapped. The temporal and spatial domain measurement of the damping time of the surface plasmon excitation allow to reveal microscopic origins of surface plasmon radiation in such suchstructures. Halbleiterlaser Nahfeldmikroskopie plasmonische Kristalle Plasmon-Nano-Optik semiconductor lasers near-field microscopy plasmonic crystals plasmonnano-optics 530 Physik 29 Physik, Astronomie ddc:530
2	Plasmonic devices for surface optics and refractive index sensing Stein, Benedikt 03 July 2012 (has links) (PDF) In this thesis devices for controlling the flow of surface plasmon polaritons are described. Dielectric and metallic nanostructures were designed for this purpose, and characterized by leakage radiation microscopy in real and in reciprocal spaces. Manipulation of surface plasmons by dielectric lenses and gradient index elements is presented, and negative refraction, steering and self-collimation of surface plasmons in one- and two-dimensional plasmonic crystals is demonstrated. The achieved degree of control was applied for routing of nanoparticles by optical forces, as well as for two methods of enhancing the figures of merit of plasmonic refractive index sensors, based on the one hand on Fano resonances natural to leakage radiation microscopy, and on the other hand on anisotropie plasmonic bandstructures. Nano-optics Surface plasmons Leakage radiation microscopy Metamaterials Plasmonic crystals Superprism effect Negative refraction Self-collimation Optical micromanipulation Refractive index sensing Fano resonances
3	Plasmonic devices for surface optics and refractive index sensing / Composants plasmoniques pour l'optique de surface et la mesure de faibles variations d'indice Stein, Benedikt 03 July 2012 (has links) Ce manuscrit s'inscrit dans le contexte du contrôle de la propagation des plasmons de surface. A cet effet, des nanostructures diélectriques et métalliques ont été conçues et caractérisées par microscopie à champ de fuite dans les espaces réels et réciproques. La manipulation des plasmons de surface à l'aide de lentilles diélectriques et d' éléments à gradient d'indice est présentée, et la réfraction négative, la direction et l'auto-collimation des plasmons de surface dans des cristaux plasmoniques à une ou deux dimensions sont démontrées. Ces résultats ont été utilisés pour le guidage de nanoparticules à l'aide de forces optiques, ainsi que pour deux méthodes permettant de renforcer le facteur de mérite de sondes plasmoniques de variation d'indice de réfraction, basées l' une sur les résonances de Fano naturelles de la microscopie à champ de fuite, et pour la seconde sur les structures des bandes plasmoniques anisotropes. / In this thesis devices for controlling the flow of surface plasmon polaritons are described. Dielectric and metallic nanostructures were designed for this purpose, and characterized by leakage radiation microscopy in real and in reciprocal spaces. Manipulation of surface plasmons by dielectric lenses and gradient index elements is presented, and negative refraction, steering and self-collimation of surface plasmons in one- and two-dimensional plasmonic crystals is demonstrated. The achieved degree of control was applied for routing of nanoparticles by optical forces, as well as for two methods of enhancing the figures of merit of plasmonic refractive index sensors, based on the one hand on Fano resonances natural to leakage radiation microscopy, and on the other hand on anisotropie plasmonic bandstructures. Nano-optique Plasmons de surface Microscopie à champ de fuite Métamatériaux Cristaux plasmoniques Effet superprisme Réfraction négative Auto-collimation Micromanipulation optique Détection de variation d'indice Résonance de Fano Nano-optics Surface plasmons Leakage radiation microscopy Metamaterials Plasmonic crystals Superprism effect Negative refraction Self-collimation Optical micromanipulation Refractive index sensing Fano resonances 539.1

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