Дисертації з теми "Plasmoncs"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Plasmoncs".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Tan, Shiaw Juen. "Linear and nonlinear propagation of localised plasmon in metallic nanostructures." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/52635/1/Shiaw_Tan_Thesis.pdf.
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 джерелаKvapil, Michal. "Lokalizované povrchové plazmony: principy a aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229109.
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 джерелаRamirez, Francisco. "Surface Plasmon Hybridization in Novel Plasmonic Phenomena." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/917.
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
Ning, Ding. "Analytical and Numerical Models of Multilayered Photonic Devices." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1207712683.
Повний текст джерелаLupetti, Mattia. "Plasmonic generation of attosecond pulses and attosecond imaging of surface plasmons." Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-183678.
Повний текст джерелаAttosekundenpulse sind ultrakurze extrem-ultraviolette (XUV) Pulse, die durch einen nicht-linearen, von einer nah-infraroten (NIR) Laserquelle stimulierten Anregungsprozess erzeugt werden. Attosekundenpulse können verwendet werden, um die Elektronendynamik eines ultraschnellen Prozesses durch die ``Attosecond Streaking'' Technik zu messen, mit einer Auflösung auf der Attosekundenskala. In dieser Dissertation wird gezeigt, dass sowohl die Erzeugung von Attosekundenpulsen als auch die Messung ultraschneller Prozesse mittels Attosekundenpulse auf Fälle erweitert werden können, bei denen die Anregungs- und Streakingsfelder von Oberflächenplasmonen generiert werden, welche bei nahinfraroten Wellenlängen auf Nanostrukturen angeregt werden. Oberflächenplasmonen sind optische Moden, die aus einer kollektiven Schwingung der Elektronen an der Oberfläche in Resonanz mit einer externen Quelle entstehen. Im ersten Abschnitt dieser Dissertation wird das Konzept der High Harmonic Generation (HHG) in plasmonisch erhöhten Feldern durch numerische Simulationen analysiert. Ein NIR Puls wird mit einem Oberflächenplasmon, das sich in einem konischen, mit Edelgas gefüllten, Hohlleiter ausbreitet, gekoppelt. Die Intensität des plasmonischen Feldes steigt mit der Verringerung des Durchmessers des Hohlleiters, sodass die Felderhöhung an seiner Spitze groß genug wird, um hohe harmonische Strahlung zu generieren. Es wird nachgewiesen, dass die Herstellung von isolierten Attosekundenpulsen mit außergewöhnlichen Zeit- und Raumstrukturen möglich ist. Trotzdem ist deren Intensität um mehrere Größenordnungen niedriger als die, die in Experimenten mit fokussierten Laserpulsen erreicht werden kann. Im zweiten Abschnitt wird eine experimentelle Technik für die Abbildung plasmonischer Oberflächenanregungen vorgeschlagen, wobei Attosekundenpulse verwendet werden, um das Feld an der Oberfläche mittels ``Momentum Streaking'' der photoionisierten Elektronen zu messen. Dieses Konzept ist eine Erweiterung der ``Attosecond Streak Camera'', welches ich ``Attosecond Photoscopy'' nenne. Es ermöglicht die Abbildung eines Plasmons in Zeit und Raum während des Anregungsprozesses. Anhand von numerischen Simulationen wird es gezeigt, dass die wesentlichen Parameter des plasmonischen Resonanzaufbaus mit subfemtosekunden-Präzision bestimmt werden können. Zuletzt wird die Methode für die numerische Lösung der Maxwell-Gleichungen diskutiert, mit Fokus auf das Problem der absorbierenden Randbedingungen. Neue Einsichten in die mathematische Formulierung der Randbedingungen der Maxwell-Gleichungen werden vorgestellt.
Durach, Maxim. "Giant Plasmonic Energy and Momentum Transfer on the Nanoscale." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/phy_astr_diss/42.
Повний текст джерелаAbid, Ines. "Plasmonique hybride : propriétés optiques de nanostructures Au-TMD, couplage plasmon-exciton." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30333/document.
Повний текст джерелаTransition 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
Huber, Jana. "Plasmonic resonances in metallic nanoarrays." Thesis, Uppsala universitet, Materialfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-262269.
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 джерелаKatzmann, Julia. "Untersuchungen zur effizienten Herstellung von Substraten für die oberflächenverstärkte Infrarotspektroskopie." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-193518.
Повний текст джерелаMetallic nanorods with lengths in the micrometer regime act as antennas for infrared light: As incident light excites a collective oscillation of the conduction electrons (a so-called plasmon), the electric field is concentrated at the rod ends. In case two antenna arms are separated by a small gap (dimer antenna), a particularly high field concentration occurs. Thereby the antennas are capable of enhancing light-matter-interaction -- for example the absorption of infrared light by molecules. This phenomenon, termed as surface enhanced infrared absorption (SEIRA), is very useful to enhance absorption signals in infrared spectroscopy. This thesis attends to the efficient fabrication of metallic nanorods for SEIRA. The first topic in focus is the manipulation of dimer antennas fabricated by electron beam lithography (EBL), featuring a gap of resolution-limited size. By applying a photochemical reduction of metal salt complexes in solution, the dimer arms are subsequently enlarged. Thereby the gap size is reduced and reaches values clearly below the resolution limit of EBL. It is shown that the IR optical properties of dimer antennas dramatically change during photochemical metal deposition. This is due to plasmonic coupling. Additionally, the absorption of infrared light by molecules located in the gap increases with decreasing gap size. The second topic in focus is the cheap fabrication of a large number of IR antennas in a parallel process. Here, porous templates of anodized aluminum oxide (AAO) are used as a negative for the metal rods to be fabricated. Firstly, it is shown that the pores of the template can be filled by photochemical reduction of gold salt complexes. For a targeted adjustment of the rod lengths and the generation of a nanoscale gap, secondly, the electrochemical filling of acsu AAO is investigated. The IR antennas prepared by this method are extracted from the template, transferred to a substrate, and individually characterized in terms of their structure and IR optical properties. Advantages and drawbacks of the fabrication methods investigated in this work as well as their applicability to the fabrication of IR antennas for SEIRA are being discussed
Constant, Thomas J. "Optical excitation of surface plasmon polaritons on novel bigratings." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/9001.
Повний текст джерелаPrabhu, G. Radhakrishna. "Studies On Surface Plasmon Resonance And Related Experimental Methods Using Fixed Plasmon Angle." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/205.
Повний текст джерелаBřínek, Lukáš. "Application of Plasmon Polaritons in Nanophotonics." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234583.
Повний текст джерелаBřínek, Lukáš. "Plazmonické rezonanční antény." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228250.
Повний текст джерелаSeidel, Jan. "Propagation, Scattering and Amplification of Surface Plasmons in Thin Silver Films." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1117625135371-32372.
Повний текст джерелаWang, Tao. "Excitation électrique de plasmons de surface avec un microscope à effet tunnel." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00868784.
Повний текст джерелаTetz, Kevin. "Plasmonics in the near-infrared spatial, spectral, and temporal studies of surface plasmon polaritons /." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3233747.
Повний текст джерелаTitle from first page of PDF file (viewed December 4, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 131-139).
See, Erich M. "Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/85400.
Повний текст джерелаPh. D.
Ajib, Rabih. "Propagation of light in Plasmonic multilayers." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC040/document.
Повний текст джерелаThe field of plasmonics aims at manipulating light using deeply subwavelength nanostructures. Such structures present a peculiar optical response because of the free electron plasma they contain. Actually, when light propagates in the vicinity of metals, usually under the form of a guided mode, it presents a low group velocity. Such modes, like plasmons and gap-plasmons, are said to be slow. In this work we present a general physical analysis of this phenomenon by studying how the energy propagates in metals in a direction that is opposite to the propagation direction of the mode. We show that the group velocity and the energy velocity are the same, and finally introduce the concept of plasmonic drag. Finally, we study how slow guided modes make structures as simple as prism couplers sensitive to the repulsion between electrons inside the plasma
Rodrigues, Marcos Renan Flores. "Estudo e caracterização de nanopartículas de Fe3O4, Fe2O3, Fe3O4/ Aunanop E Fe2O3/Aunanop." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/184573.
Повний текст джерелаFe3O4 and Fe2O3 nanoparticles were synthesized by coprecipitation route carried out under N2 atmosphere, maintaining the pH between 9 and 14 at room temperature and using FeCl2 and FeCl3 as precursors. After synthesis the iron oxide nanoparticles were thermally treated at 250, 500 and 800 oC. To obtain a hybrid system, gold nanoparticles were synthesized on the thermally treated oxide nanoparticles. The samples were analyzed by UV-Vis, X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (MET-AR), spectroscopy in the region of Infrared (FTIR), vibrating sample magnitude (VSM) and Mossbauer, and applied to produce H2 through hydrazine decomposition. The results show the synthesis of Fe3O4 nanoparticles with average diameter of about 7 nm. When heated to 250 oC the average size increased to about 11 nm and a small change in the optical and structural behavior was observed, while the superparamegnetic behaviour was maintained. When heated to 500 °C, the average particle size increase to ca 51nm, significant changes in the optical, morphological and structural properties are observed, in addition to a transition from superparamegnetic to paramagnetic behaviour. When heated to 800 oC the effects on the properties are even more significant; the nanoparticles increase to ca. 200 nm, the absorption spectrum in UV-Vis changes significantly and the particles present paramagnetic behaviour. The results suggest that when heated to 250 and 500 oC a mixture of -Fe2O3 e -Fe2O3 is obtained, after heating at 800 oC only -Fe2O3 is observed. The gold nanoparticles synthesized on the iron oxides present average size of 6.0 nm, and did not affect the magnetic properties of the oxides. The iron oxides/gold nanoparticle samples were efficiently applied to produce hydrogen, promoting the decomposition of hydrazin. The selectivity to hydrogen reached up to 33%.
Rahbany, Nancy. "Towards integrated optics at the nanoscale : plasmon-emitter coupling using plasmonic structures." Thesis, Troyes, 2016. http://www.theses.fr/2016TROY0003/document.
Повний текст джерелаThere is a growing interest nowadays in the study of strong light-matter interaction at the nanoscale, specifically between plasmons and emitters. Researchers in the fields of plasmonics, nanooptics and nanophotonics are constantly exploring new ways to control and enhance surface plasmon launching, propagation, and localization. Moreover, emitters placed in the vicinity of metallic nanoantennas exhibit a fluorescence rate enhancement due to the increase in the electromagnetic field confinement. However, numerous applications such as optical electronics, nanofabrication and sensing devices require a very high optical resolution which is limited by the diffraction limit. Targeting this problem, we introduce a novel plasmonic structure consisting of nanoantennas integrated in the center of ring diffraction gratings. Propagating surface plasmon polaritons (SPPs) are generated by the ring grating and couple with localized surface plasmons (LSPs) at the nanoantennas exciting emitters placed in the gap. We provide a thorough characterization of the optical properties of the simple ring grating structure, the double bowtie nanoantenna, and the integrated ring grating/nanoantenna structure, and study the coupling with an ensemble of molecules as well as single SiV centers in diamond. The combination of the sub-wavelength confinement of LSPs and the high energy of SPPs in our structure leads to precise nanofocusing at the nanoscale, which can be implemented to study plasmon-emitter coupling in the weak and strong coupling regimes
Lamowski, Simon [Verfasser]. "Theory of Plasmonic Nanostructures : Plasmon-Polaritons and Light-Induced Transport / Simon Lamowski." Konstanz : KOPS Universität Konstanz, 2020. http://d-nb.info/1233203231/34.
Повний текст джерелаMetzger, Bernd [Verfasser], and Harald [Akademischer Betreuer] Giessen. "Ultrafast nonlinear plasmonics : from dipole nanoantennas to hybrid complex plasmonic structures / Bernd Metzger. Betreuer: Harald Giessen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1062951379/34.
Повний текст джерелаYin, Xinghui [Verfasser], and Harald [Akademischer Betreuer] Giessen. "Functional complex plasmonics : understanding and realizing chiral and active plasmonic systems / Xinghui Yin ; Betreuer: Harald Giessen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1141176394/34.
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.
Gorunmez, Zohre. "Finite-Difference Time-Domain (FDTD) Modeling of Nanoscale Plasmonic Substrates for Surface-Enhanced Raman Spectroscopy (SERS)." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563296001850111.
Повний текст джерелаBurnett, Mathew T. "Microspectroscopy of localised plasmons." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516954.
Повний текст джерелаHalabuková, Hana. "Fourierova infračervená spektroskopie na nanostrukturách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402644.
Повний текст джерелаGordon, Joshua Ari. "Coated Nano-particles for Optical Metamaterials and Nano-photonic Applications." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195907.
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
Renger, Jan. "Excitation, Interaction, and Scattering of Localized and Propagating Surface Polaritons." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1153478195966-65404.
Повний текст джерелаDie Wechselwirkung von elektromagnetischer Strahlung mit subwellenlängenkleinen Teilchen bzw. Oberflächenstrukturen ermöglicht nicht nur eine Miniaturisierung optischer Geräte, sondern erlaubt sehr interessante Anwendungen, beispielsweise in der Sensorik und Nahfeldoptik. In der vorliegenden Arbeit werden die zu Grunde liegenden Effekte im Rahmen der klassischen Elektrodynamik mit Hilfe der semianalytischen Methode der multiplen Multipole (MMP) analysiert, und die Ergebnisse werden mit Experimenten verglichen. Im ersten Teil werden Oberflächenplasmonenresonanzen (engl. surface plasmon resonance - SPR) einzelner und wechselwirkender Metallteilchen untersucht. Die dabei auftretende resonante kollektive Schwingung der freien Elektronen des Partikels bewirkt eine deutliche Erhöhung und Lokalisierung des elektromagnetischen Feldes in seiner Umgebung. Die spektrale Position und die Stärke der SPR eines Nanoteilchens, die von dessen geometrischer Form, Permittivität und Umgebung abhängen, können nur im Grenzfall sehr kleiner Teilchen elektrostatisch beschrieben werden, wohingegen der verwendete semianalytische MMP-Ansatz weitaus flexibler ist und insbesondere auch auf größere Partikel, Teilchen mit komplizierterer Form bzw. Ensembles von Partikeln anwendbar ist. Die betrachteten einzelnen kleinen (< Wellenlänge) Goldkügelchen und Silberellipsoide besitzen eine stark ausgeprägte SPR im sichtbaren optischen Bereich. Diese ist auf eine dipolartige Polarisierung des Teilchens zurückzuführen. Höhere Moden der Polarisation können entweder als Folge von Retardierungseffekten an größeren (mit der Wellenlänge vergleichbaren) Teilchen oder bei der Verwendung inhomogener (z.B. evaneszenter) Wellen angeregt werden. Partikel, die sich in der Nähe eines Substrates befinden, unterliegen der Nahfeldwechselwirkung zwischen den (lichtinduzierten) Oberflächenladungen auf der Oberfläche des Teilchens und des Substrats. Dies führt zu einer Verschiebung der SPR zu niedrigeren Frequenzen und einer Erhöhung des lokalen elektrischen Feldes. Letzteres bildet die Grundlage z.B. der spitzenverstärkten Raman-Spektroskopie und der optischen Nahfeldmikroskopie mit Streulichtdetektion. Dasselbe Prinzip bewirkt ein stark überhöhtes elektrisches Feld zwischen miteinander wechselwirkenden Nanopartikeln, welches z.B. die Sensitivität der oberflächenverstärkten Raman-Mikroskopie um mehrere Größenordnungen steigern kann. Im Gegensatz zur SPR einzelner Nanopartikel kann die Resonanz der Lichtstreuung im Fall eines Partikels in der Nähe eines Substrats aus der durch die Nahfeldwechselwirkung induzierten Anregung elektromagnetischer Oberflächenzustände entstehen. Diese wirken ihrerseits auf das Nanopartikel zurück, wobei eine resonante Lichtstreuung beobachtbar ist. Dieser, am Beispiel einer metallischen Nahfeldsonde über einem Siliziumcarbid-Substrat analysierte, Effekt ermöglicht bei einer ganzen Klasse von polaren Kristallen interessante Anwendungen in der Mikroskopie und Sensorik basierend auf der hohen Dichte von Oberflächenphononpolaritonen dieser Kristalle im mittleren infraroten Spektralbereich und deren nahfeldinduzierten Anregung. Im zweiten Teil der Arbeit werden kollektive Anregungen von Elektronen an Metalloberflächen untersucht. Die dabei auftretenden plasmonischen Oberflächenwellen (engl. surface plasmon polaritons - SPPs) weisen einen exponentiellen Abfall der Intensität senkrecht zur Grenzfläche auf. Diese starke Lokalisierung der Energie an der Oberfläche bildet die Grundlage vieler Anwendungen, z.B. im Bereich der hochempfindlichen Detektion (bio)chemischer Verbindungen oder für eine zweidimensionale Optik (engl. plasmonics). Das Aufheben der Translationsinvarianz längs der Oberfläche ermöglicht die direkte Anregung von SPPs durch ebene Wellen. Die Abhängigkeit dieser Kopplung von der Geometrie wird am Beispiel eines Nanograbens untersucht. Dabei werden neben den SPPs ebenfalls eine oder mehrere Moden im Graben angeregt. Folglich ermöglicht die geeignete Wahl der Grabengeometrie die Optimierung der Umwandlung von ebenen Wellen in SPPs. Im - in der Praxis weit verbreiteten - Fall asymmetrisch eingebetteter metallischer Dünnschichtwellenleiter existieren zwei Moden. In Abhängigkeit von der Grabenbreite kann die eine oder die andere Mode bevorzugt angeregt werden. Die Analyse der Wechselwirkung von SPPs mit Oberflächenstrukturen, z.B. Kanten, Stufen, Barrieren und Gräben, zeigt die Möglichkeit der Steuerung der Reflexions-, Transmissions- und Abstrahleigenschaften durch die gezielte Wahl der Geometrie der "Oberflächendefekte" auf der Nanoskala und deckt die zu Grunde liegenden Mechanismen und die daraus resultierenden Anforderungen bei der Herstellung neuer plasmonischer Komponenten auf. Exemplarisch wird das Prinzip der SPP-Anregung an einzelnen und mehreren Gräben in dünnen metallischen Filmen sowie der subwellenlängen Feldlokalisierung an sich verjüngenden metallischen Dünnschichtwellenleitern unter Verwendung der optischen Nahfeldmikroskopie experimentell gezeigt
Hou, Xue. "Nano-objets photo-activés pour le ciblage cellulaire et l’hyperthermie." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC011/document.
Повний текст джерелаPlasmonic nanoparticles possessinteresting properties thanks to the localizedsurface plasmon resonance. In addition totheir high photothermal conversion efficiency,the heat release confinement can bemodulated by the type of light source used(pulsed or continuous laser). These propertiesmake the plasmonic nanoparticles a potentialsolution for cancer therapy by hyperthermia.In order to develop such a biomedicalapplication, it is necessary to optimize theabsorption of light energy and the targeting ofnanoparticles on the tumor considered.In this thesis, the influence of the photogeneratedhot electrons on the absorption ofultrashort laser pulses by nanoparticles is firststudied. Then, a work carried out withchemists, biologists and physicians for theapplication of gold nanoparticles irradiated byultrashort laser pulses to cancer therapy isdescribed. Finally, we present a preliminarystudy on the photoluminescence of plasmonicnanoparticles, the origin of which is stillcontroversial, by applying a model accountingfor the non-thermal nature of the hot electrondistribution
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 джерелаBartholomew, Richard John. "Dynamic plasmonic metasurfaces in the visible spectrum." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274755.
Повний текст джерелаStone, Edmund K. "Semiconductor surface plasmons : a route to terahertz waveguides and sensors." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3582.
Повний текст джерелаLi, Zhi. "Controlled nanotherapies using magneto-plasmonic nanodomes." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667779.
Повний текст джерелаWith the aim of improving the concentration of the therapeutic agents inside tumours and maximizing their therapeutic effects, this Thesis focused on developing novel versatile magneto-plasmonic nanodomes (i.e. dielectric nanoparticles with plasmonic and ferromagnetic semi-shells) externally actuated and controlled by light and magnetic fields for efficient nanotherapy activation, amplification and control. The innovative combination of bottom-up and top-down fabrication processes have enabled us: i) merging nanomaterials that could be hardly combined by chemical synthesis, ii) fine tuning the magnetic and optical properties, iii) achieving simple functionalization and direct dispersion in water solutions, and iv) keeping low cost and scalability. Firstly, we developed Fe/Au nanodomes with fluorescent cores for magnetically amplified photothermal therapies and multimodal imaging. The variation of the Fe and Au layers thickness enabled attaining colloidally stable single domain or vortex ferromagnetic nanoparticles with widely tunable optical properties. Thick Fe layers provided strongly supressed scattering and high optical absorption in the near infrared, which were key to demonstrate high photothermal conversion efficiencies (ca. 65%). The capacity to magnetically concentrate the nanodomes at the illuminated region enhanced even further the local heating efficiency. The Fe/Au semi-shell and the fluorescent polymer core provided intense contrasts in T2 nuclear magnetic resonance, X-ray absorption, and fluorescence. The in vitro results showed low cytotoxicity and magnetically enhanced photothermal effects for cancer cell eradication, which highlighted the biomedical potential. To gain control on the photothermal effects, in the second part we developed a novel simultaneous nano-heating/thermometry concept, based on the efficient magnetic rotation of highly anisotropic magneto-plasmonic nanodomes. By analyzing the nanodomes rotation as a function of the magnetic frequency, we quantified and monitored the viscosity reduction in the fluid surrounding the optically heated nanodomes, as novel nanothermometry concept. This nanothermometers showed a low detection limit of 0.05ºC, independence on their concentration, and much simpler and cost-effective detection setup than luminescent nanothermometers. The capacity to integrate heating and thermometry in a single nanostructure and using the same laser for heating and detecting were relevant advantages that could be demonstrated even in highly concentrated cell dispersions. The final goal of the Thesis was maximizing the biomedical potential of the nanodomes for cancer nanotherapies by developing fully biodegradable drug loaded PLGA@Fe/SiO2 magnetoplasmonic nanocapsules to achieve: i) improved biodegradability, ii) reinforced magnetic actuation, iii) high photothermal conversion efficiency in both near-infrared biological windows (63-67%), iv) higher T2 contrast in nuclear magnetic resonance, and v) integrated nanothermometry and biosensing. The unloaded nanocapsules showed very low toxicity in vitro in long-term cell cultures, and in vivo in mice. The high T2 contrast was exploited to monitor the in vivo biodistribution of the nanocapsules after intravenous injection, which showed accumulation in the liver 1h after the injection, and almost total recovery after 96h. These preliminary results are encouraging for their application in multi-active local therapies. In conclusion, we have shown how a hybrid nanofabrication strategy could exploited to develop nanostructures with strong ferromagnetic and plasmonic properties enabling external control and non-invasive visualization. The in vitro and preliminary in vivo results encourage further technological development of this novel nanotechnology for clinical applications.
Cleary, Justin. "Surface Plasmon Hosts for Infrared Waveguides and Biosensors, and Plasmons in Gold-Black Nano-Structured Films." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3562.
Повний текст джерелаPh.D.
Department of Physics
Sciences
Physics PhD
López, Muñoz Gerardo Arturo. "Simple and low cost nanostructured plasmonic biosensor for sensitive and multiplexed biodetection." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/665242.
Повний текст джерелаThe increasing demand for analytical platforms that are reliable and, at the same time, easy to use and compact, that require low sample consumption and provide high sensitivity and real-time response, have provided considerable innovation in the design of the biosensors. Among all of them, those based on surface plasmon resonance phenomena (SPR) have been the subject of great scientific interest in recent decades because they provide high sensitivity and simplicity in the detection schemes. With the advance in nanofabrication techniques, the development of optical sensors based on plasmonic nanostructures has represented an excellent way to integrate them into Lab-on-a-chip devices with a small size, with the ability to solve some of the current challenges related to the analysis times, the volume of sample required and the feasibility of detecting several analytes at the same time multiplexed. With the purpose of offering simple and inexpensive biosensing tools, this Doctoral Thesis presents the development of nanoplasmonic biosensors integrated in Lab-on-a-Chip (LOC) platforms for the multiplexed biosensing of different analytes in real time. The developed sensor is based on the use of commercial Blu-Ray discs as a substrate containing nano-slits to generate the plasmon resonance phenomena by coating them with different metallic layers on a nanometric scale. The developed nanobiosensors are a very promising alternative that could replace conventional analysis techniques, simplifying processes and overcoming the main current challenges related to sensitivity, cost and time required for clinical diagnosis.
Debroux, Romain L. "Polarization Conversion Mediated Surface Plasmon Polaritons in Extraordinary Optical Transmission through a Nanohole Arrays." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83408.
Повний текст джерелаMaster of Science
He, Zhixing. "Self-assembly of anisotropic nanostructures and interferometric spectroscopy." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97402.
Повний текст джерелаDoctor of Philosophy
Nanotechnology is the study and application of phenomena at the nanoscale, which is between 1 and 100 nm. Due to quantum effects, nanomaterials exhibit many interesting properties that cannot be found in bulk materials and are highly influenced by the shape of the nanostructures. One of the most promising strategies for forming complex nanostructures is to use smaller nanoparticles as building blocks. Therefore, significant efforts have been spent on the studies of the fabrication and modeling of the assembly of nanostructures. As a good starting point for analyzing the mechanism of self-assembly, we focus on the most basic structure, one-dimensional (1D) nanowires and chains. First, we demonstrate a simple method to fabricate one-dimensional magnetic chains from spherical magnetic nanoparticles in a rotating magnetic field. The growth mechanism of the nanochains is investigated, indicating the theory developed for chains formed with larger beads is not applicable at the nanoscale, and additional factors, such as the effect of temperature, need to be considered. Second, we introduce a fast, sensitive optical technique for characterizing anisotropic nanostructures. Because of their unique optical properties, gold nanorods are used to demonstrate the capabilities of the optical system. Not only static properties (orientation, aspect ratio), but also dynamics properties (rotational motion), of single gold nanorods are characterized quantitatively. Finally, this optical technique is extended to preliminary work on characterizing magnetic chain assembly. The processes of magnetic cluster binding and dissociation in a magnetic field are monitored and analyzed.
Chamtouri, Maha. "Etude exhaustive de la sensibilité des Biopuces plasmoniques structurées intégrant un réseau rectangulaire 1D : effet de la transition des plasmons localisés vers les plasmons propagatifs." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112060/document.
Повний текст джерелаSurface plasmons resonance imaging with continuous thin metallic films have become a central tool for the study of biomolecular interactions. However, in order to extend the field of applications of surface plasmons resonance systems to the trace detection of biomolecules having low molecular weight, a change in the plasmonic sensing methodology is needed. In this study, we investigate theoretically and experimentally the sensing potential of 2D nano- and micro- ribbon grating structuration on the surface of Kretschmann-based surface plasmon resonance biosensors when they are used for detection of biomolecular binding events. Numerical simulations were carried out by employing a fast and novel model based on the hybridization of two classical methods, the Fourier Modal Method and the Finite Element Method. Our calculations confirm the importance of light manipulation by means of structuration of the plasmonic thin film surfaces on the nano- and micro- scales. Not only does it highlight the geometric parameters that allow the sensitivity enhancement, and associated figures of merit, compared with the response of the conventional surface plasmon resonance biosensor based on a flat surface, but it also describes the transition from the regime where the propagating surface plasmon mode dominates to the regime where the localized surface plasmon mode dominates. An exhaustive mapping of the biosensing potential of the nano- and micro- structured biosensors surface is presented, varying the structural parameters related to the ribbon grating dimensions. New figures of merit are introduced to evaluate the performance of the structured biosensors. The structuration also leads to the creation of regions on biosensor chips that are characterized by strongly enhanced electromagnetic fields. New opportunities for further improving the bio-sensitivity are offered if localization of biomolecules can be carried out in these regions of high electromagnetic fields enhancement and confined
Reed, Jennifer. "Light-Matter Interactions of Plasmonic Nanostructures." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6009.
Повний текст джерелаPh.D.
Doctorate
Chemistry
Sciences
Chemistry
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.
Повний текст джерелаSchira, Romain. "Réponse optique d’agrégats d’argent : excitations plasmoniques et effets de l’environnement." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1162/document.
Повний текст джерелаOptical responses of noble metal clusters are characterized by a strong absorption in the UV-Visible range called localized surface plasmon. For clusters of several nanometers, the plasmon phenomenon can be interpreted by semi-classical or classical model, as the Mie theory, but those models can not describe the optical response of small-size clusters. The time dependent density functional theory (TDDFT) is a quantum method that allow to understand the plasmon phenomenon by reproducing the optical response of small silver cluster, made of a few tens or hundreds atoms. In this context, we performed TDDFT calculation using Range-Separated Hybrid (RSH) functionals over cluster containing between 8 and 147 silver atoms. The obtained spectra are in excellent agreement with the experimental ones and the calculated optical response allows to recover the shell model prediction. We present some tools that allow to identify and characterize plasmonic excitations within the TDDFT framework. The effect of the surrounding medium over the optical response of clusters are studied, in particular we will present a methodology that allow to reproduce spectra measured over clusters trapped in rare gas matrix. The effects of the oxidation and the effects induced by a silica matrix over the optical response of clusters are also studied
Biesso, Arianna. "Plasmonic field effects on the spectroscopic and photobiological function of the photosynthetic system of bacteriorhodopsin." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28162.
Повний текст джерелаCommittee Chair: Mostafa A. El-Sayed; Committee Member: Adegboyega K. Oyelere; Committee Member: Bridgette Barry; Committee Member: Joseph W. Perry; Committee Member: Mark R. Prausnitz.
Vogel, 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 джерела