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Статті в журналах з теми "Plasmonic potentials"
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Zhuo, Liqiang, Huiru He, Ruimin Huang, Zhi Li, Weibin Qiu, Fengjiang Zhuang, Shaojian Su, Zhili Lin, Beiju Huang, and Qiang Kan. "Flat band of Kagome lattice in graphene plasmonic crystals." Journal of Physics D: Applied Physics 55, no. 6 (November 2, 2021): 065106. http://dx.doi.org/10.1088/1361-6463/ac30fe.
Повний текст джерелаАнотація:
Abstract We propose graphene plasmonic crystals (GPCs) with a Kagome lattice, and investigate the properties of the flat band (FB) in the plasmonic system. By modulating the arrangement of the chemical potentials, a FB is obtained. Furthermore, the authenticity of the FB is confirmed by comparing the band structures and the eigen field distributions obtained from using the tight-binding modeled Hamiltonian with numerical calculations. The proposed Kagome-type GPCs could be of great significance for the study of novel effects in strong interaction systems in the field of plasmonics.
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Tatsuma, Tetsu, and Hiroyasu Nishi. "Plasmonic hole ejection involved in plasmon-induced charge separation." Nanoscale Horizons 5, no. 4 (2020): 597–606. http://dx.doi.org/10.1039/c9nh00649d.
Повний текст джерелаАнотація:
Hot hole ejection from the resonance sites of plasmonic nanoparticles on a semiconductor or an electrode enables oxidation at more positive potentials, output of higher voltage, and site-selective photo-oxidation beyond the diffraction limit.
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Yan, Siqi, Xiaolong Zhu, Jianji Dong, Yunhong Ding, and Sanshui Xiao. "2D materials integrated with metallic nanostructures: fundamentals and optoelectronic applications." Nanophotonics 9, no. 7 (April 17, 2020): 1877–900. http://dx.doi.org/10.1515/nanoph-2020-0074.
Повний текст джерелаАнотація:
AbstractDue to their novel electronic and optical properties, atomically thin layered two-dimensional (2D) materials are becoming promising to realize novel functional optoelectronic devices including photodetectors, modulators, and lasers. However, light–matter interactions in 2D materials are often weak because of the atomic-scale thickness, thus limiting the performances of these devices. Metallic nanostructures supporting surface plasmon polaritons show strong ability to concentrate light within subwavelength region, opening thereby new avenues for strengthening the light–matter interactions and miniaturizing the devices. This review starts to present how to use metallic nanostructures to enhance light–matter interactions in 2D materials, mainly focusing on photoluminescence, Raman scattering, and nonlinearities of 2D materials. In addition, an overview of ultraconfined acoustic-like plasmons in hybrid graphene–metal structures is given, discussing the nonlocal response and quantum mechanical features of the graphene plasmons and metals. Then, the review summarizes the latest development of 2D material–based optoelectronic devices integrated with plasmonic nanostructures. Both off-chip and on-chip devices including modulators and photodetectors are discussed. The potentials of hybrid 2D materials plasmonic optoelectronic devices are finally summarized, giving the future research directions for applications in optical interconnects and optical communications.
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Mildner, Matthias, Andreas Horrer, Monika Fleischer, Claus Zimmermann, and Sebastian Slama. "Plasmonic trapping potentials for cold atoms." Journal of Physics B: Atomic, Molecular and Optical Physics 51, no. 13 (June 12, 2018): 135005. http://dx.doi.org/10.1088/1361-6455/aac5ac.
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Popov, Vyacheslav V. "Plasmonic Devices for Detection of Terahertz Radiation." Siberian Journal of Physics 5, no. 4 (December 1, 2010): 140–46. http://dx.doi.org/10.54362/1818-7919-2010-5-4-140-146.
Повний текст джерелаАнотація:
Physics of plasma oscillations and basic principles of plasmonic detection of terahertz radiation in FET structures with two-dimensional electron channels are discussed. Plasmonic devices are practically attractive because they are extremely fast and electrically tunable through the entire terahertz frequency band by changing electric potentials at metal contacts of the device
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Zhuo, Liqiang, Huiru He, Ruimin Huang, Shaojian Su, Zhili Lin, Weibin Qiu, Beiju Huang, and Qiang Kan. "Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials." Nanomaterials 11, no. 7 (July 12, 2021): 1808. http://dx.doi.org/10.3390/nano11071808.
Повний текст джерелаАнотація:
The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edges at the inverse valley Hall phase interfaces composed of ordinary optical dielectric materials, the dispersion and the frequency range of the edge states cannot be tuned once the geometrical parameters of the materials are determined. In this paper, we propose a chirped valley graphene plasmonic metamaterial waveguide composed of the valley graphene plasmonic metamaterials (VGPMs) with regularly varying chemical potentials while keeping the geometrical parameters constant. Due to the excellent tunability of graphene, the proposed waveguide supports group velocity modulation and zero group velocity of the edge states, where the light field of different frequencies focuses at different specific locations. The proposed structures may find significant applications in the fields of slow light, micro–nano-optics, topological plasmonics, and on-chip light manipulation.
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Di Martino, G., V. A. Turek, C. Tserkezis, A. Lombardi, A. Kuhn, and J. J. Baumberg. "Plasmonic response and SERS modulation in electrochemical applied potentials." Faraday Discussions 205 (2017): 537–45. http://dx.doi.org/10.1039/c7fd00130d.
Повний текст джерелаАнотація:
We study the optical response of individual nm-wide plasmonic nanocavities using a nanoparticle-on-mirror design utilised as an electrode in an electrochemical cell. In this geometry Au nanoparticles are separated from a bulk Au film by an ultrathin molecular spacer, giving intense and stable Raman amplification of 100 molecules. Modulation of the plasmonic spectra and the SERS response is observed with an applied voltage under a variety of electrolytes. Different scenarios are discussed to untangle the various mechanisms that can be involved in the electronic interaction between NPs and electrode surfaces.
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Alù, Andrea, and Nader Engheta. "Plasmonic and metamaterial cloaking: physical mechanisms and potentials." Journal of Optics A: Pure and Applied Optics 10, no. 9 (August 19, 2008): 093002. http://dx.doi.org/10.1088/1464-4258/10/9/093002.
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Liu, Wei, Dragomir N. Neshev, Ilya V. Shadrivov, Andrey E. Miroshnichenko, and Yuri S. Kivshar. "Plasmonic Airy beam manipulation in linear optical potentials." Optics Letters 36, no. 7 (March 25, 2011): 1164. http://dx.doi.org/10.1364/ol.36.001164.
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Huang, Shenyang, Chaoyu Song, Guowei Zhang, and Hugen Yan. "Graphene plasmonics: physics and potential applications." Nanophotonics 6, no. 6 (October 18, 2016): 1191–204. http://dx.doi.org/10.1515/nanoph-2016-0126.
Повний текст джерелаАнотація:
AbstractPlasmon in graphene possesses many unique properties. It originates from the collective motion of massless Dirac fermions, and the carrier density dependence is distinctively different from conventional plasmons. In addition, graphene plasmon is highly tunable and shows strong energy confinement capability. Most intriguingly, as an atom-thin layer, graphene and its plasmon are very sensitive to the immediate environment. Graphene plasmons strongly couple to polar phonons of the substrate, molecular vibrations of the adsorbates, and lattice vibrations of other atomically thin layers. In this review, we present the most important advances in graphene plasmonics field. The topics include terahertz plasmons, mid-infrared plasmons, plasmon-phonon interactions, and potential applications. Graphene plasmonics opens an avenue for reconfigurable metamaterials and metasurfaces; it is an exciting and promising new subject in the nanophotonics and plasmonics research field.
Дисертації з теми "Plasmonic potentials"
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Ruiz, Matias. "Analyse mathématique de résonances plasmoniques pour des nanoparticules et applications." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE054/document.
Повний текст джерелаАнотація:
Cette thèse porte sur l’étude mathématique des interactions entre la lumière et certains types de nanoparticules.À l’échelle du nanomètre, des particules métalliques comme l’or ou l’argent subissent un phénomène de résonance lorsque leurs électrons libres interagissent avec un champ électromagnétique. Cette interaction produit une augmentation du champs électrique proche et lointain, leur permettant d’améliorer la luminosité et la directivité de la lumière, confinant des champs électromagnétiques dans des directions avantageuses. Ce phénomène, appelé "résonances plasmoniques pour des nanoparticules" ouvre une porte sur une large gamme d’applications, des nouvelles techniques d’imagerie médicale à des panneaux solaires efficaces. En utilisant des techniques issues des potentiels de couches et de la théorie de la perturbation,nous proposons une étude de la dispersion d’ondes électromagnétiques par une et plusieurs nanoparticules plasmoniques, dans le cadre quasi-statique, Helmholtz et Maxwell. Nous étudions ensuite certaines applications tel que la génération de chaleur, les métasurfaces et l’imagerie super-résolueThis thesis deals with the mathematical study of the interactions between light and certain types of nanoparticles. At the nanometer scale, metal particles such as gold or silver undergo a resonance phenomenon when their free electrons interact with an electromagnetic field. This interaction results in an enhancement of the near and far electric field, enabling them to improve the brightness and the directivity of the light, confining electromagnetic fields in advantageous directions. This phenomenon, called "plasmonic resonances for nanoparticles", opens a door to a wide range of applications, from new medical imaging techniques to efficient solar panels. Using layer potentials techniques and perturbation theory, we proposea study of the scattering of electromagnetic waves by one and several plasmonic nanoparticles in the quasi-static, Helmholtz and Maxwell framework. We then study some applications such as heat generation, metasurfaces and super-resolution
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Perez, Florent. "Plasmons dans un potentiel unidimensionnelEtude par spectroscopie Raman de fils quantiques gravés." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1998. http://tel.archives-ouvertes.fr/tel-00285443.
Повний текст джерелаАнотація:
Nous avons étudiés des fils quantiques dopés de semi-conducteurs gravés par spectroscopie de diffusion Raman. Nous avons observés les excitations du gaz d'électrons. Celles-ci présentent des règles de sélection différentes de celles établies pour les systèmes bi-dimensionnels. Nous avons montré théoriquement qu'elles proviennent de la modification de la structure du champ électromagnétique local provoquée par la géométrie particulière des fils gravés. Pour cela nous avons dû calculer le champ local et l'introduire dans la section efficace de diffusion Raman pour en déduire les règles de sélection de toutes les excitations. Cela a permis de déterminer sans équivoque la nature des excitations qui sont des plasmons. Aucune excitations à une particule ni fluctuations de densité de spin n'a été observées. Nous avons étudié l'évolution continue des dispersions de ces plasmons lorsque la largeur du fil est réduite de 1 micromètre à 30 nm. Jusqu'à 60 nm, celles-ci sont en très bon accord avec les résultats d'un modèle hydrodynamique. Au dessous de 60 nm, la comparaison avec un modèle RPA s'impose. Le plasmon intra-bande dispersif est observé jusqu'à 45 nm, largeur en dessous de laquelle les spectres Raman sont dominés par des excitations localisées qui nécessitent une analyse ultérieure pour en déterminer clairement leur nature. Nous montrons à l'aide du modèle RPA que nous avons atteint la limite quantique pour un fil de largeur 55 nm. Une gamme étroite de fils dont les largeurs sont comprises entre 55 nm à 45 nm permet donc l'étude de gaz strictement unidimensionnel.Nous avons cherché à déterminer la contribution de la forte illumination dans les conclusions précédentes. Nous avons utilisé pour cela la spectroscopie de magnéto-transmission infra-rouge qui ne modifie pas les conditions d'équilibre du gaz d'électrons. Une largeur critique de 130 nm a été extraite, en dessous de laquelle nous n'avons plus aucun signe de la présence d'électrons libres. La comparaison des mesures Raman et infra-rouge a permis l'établissement et la validation d'un modèle microscopique du potentiel de confinement présent dans les fils. Enfin nous avons fabriqués des échantillons de géométries plus complexes. L'observation et l'analyse par diffusion Raman des plasmons dans ces fils a montré que nous pouvions contrôler la géométrie du potentiel confinant les électrons et a mis en évidence des effets nouveaux tels que le repliement et le confinement de plasmons unidimensionnels.
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Perez, Florent. "Plasmons dans un potentiel unidimensionnel : étude par spectroscopie Raman de fils quantiques gravés." Paris 6, 1998. http://www.theses.fr/1998PA066724.
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Bellouvet, Maxime. "Condensation de Bose-Einstein et simulation d’une méthode de piégeage d’atomes froids dans des potentiels sublongueur d’onde en champ proche d’une surface nanostructurée." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0265/document.
Повний текст джерелаАнотація:
Depuis plusieurs décennies un intérêt est né pour combiner deux systèmes quantiques pour former unsystème hybride quantique (SHQ) aux qualités qu’il serait impossible d’atteindre avec un seul des deuxsous-constituants. Parmi les systèmes quantiques, les atomes froids se distinguent par leur fort découplagede l’environnement, permettant un contrôle précis de leurs propriétés intrinsèques. En outre, les simulateursquantiques réalisés en piégeant des atomes froids dans des réseaux optiques présentent des propriétéscontrôlables (échelle d’énergie, géométrie,...) qui permettent d’étudier de nouveaux régimes intéressants enphysique de la matière condensée. Dans cette quête de phases quantiques exotiques (e.g., antiferromagnétisme),la réduction de l’entropie thermique est un défi crucial. Le prix à payer pour atteindre de si faiblestempérature et entropie est un long temps de thermalisation qui limite la réalisation expérimentale. La réductionde la période du réseau est une solution prometteuse pour augmenter la dynamique du système.Les SHQs avec des atomes froids offrent de riches perspectives mais requiert d’interfacer des systèmes quantiquesdans des états différents (solide/gaz) à des distances très proches, ce qui reste un défi expérimental.Le projet AUFRONS, dans lequel s’inscrit cette thèse, vise à refroidir un gaz d’atomes froids jusqu’aurégime de dégénérescence quantique puis de transporter et piéger ce nuage en champ proche d’une nanostructure.L’idée est d’obtenir un gaz d’atomes froids piégé dans un réseau bidimensionnel aux dimensionssublongueur d’onde, à quelques dizaines de nm de la structure. Un des objectifs est d’étudier les interactionsau sein du réseau mais également le couplage des atomes avec les modes de surface.Le travail réalisé durant cette thèse se décompose en une partie expérimentale et une partie théorique.Dans la première nous présentons le refroidissement d’atomes de 87Rb jusqu’au régime de dégénérescencequantique. La seconde partie est consacrée aux simulations théoriques d’une nouvelle méthode que nousavons implémentée pour piéger et manipuler des atomes froids à moins de 100 nm d’une nanostructure.Cette méthode, qui tire profit de la résonance plasmonique et des forces du vide (effet Casimir-Polder),permet de créer des potentiels sublongueur d’onde aux paramètres contrôlables. Nous détaillons ainsi lescalculs des forces optiques et des forces du vide que nous appliquons au cas d’un atome de 87Rb en champproche d’une nanostructure 1DAn interest for hybrid quantum systems (HSQs) has been growing up for the last decades. This object combines two quantum systems in order to take advantage of both systems’ qualities, not available withonly one. Among these quantum systems, ultracold atoms distinguish themselves by their strong decoupling from environment which enables an excellent control of their intrinsic properties. Optical lattice quantum simulators with tunable properties (energy scale, geometry,...) allows one to investigate new regimes incondensed matter physics. In this quest for exotic quantum phases (e.g., antiferromagnetism), the reduction of thermal entropy is a crucial challenge. The price to pay for such low temperature and entropy is a longthermalization time that will ultimately limit the experimental realization. Miniaturization of lattice spacingis a promising solution to speed up the dynamics. Engineering cold atom hybrids offers promising perspectives but requires us to interface quantum systems in different states of matter at very short distances, which still remains an experimental challenge.This thesis is part of the AUFRONS project, which aims at cooling down an atomic gas until the quantum degeneracy regime then transport and trap this cloud in the near field of a nanostructure. The idea is to trapcold atoms in a two-dimensional subwavelength lattice, at a few tenth of nm away from the surface. One goal is to study atom-atom interactions within the lattice but also atom-surface modes coupling.The work realized during this thesis splits into an experimental part and a theoretical part. In the firstone, we present the cooling of 87Rb atoms until the quantum degeneracy regime. The second part is dedicated to theoretical simulations of a new trapping method we have implemented to trap and manipulate cold atoms below 100 nm from structures. This method takes advantage of plasmonic resonance and vacuum forces (Casimir-Polder effect). It allows one to create subwavelength potentials with controllable parameters.We detail the calculations of optical and vacuum forces to apply them to an atom of 87Rb in the vicinity of a 1D nanostructure
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Pesset, Bénédicte. "Conception, synthèse et vectorisation d'inhibiteurs potentiels de la protéine bactérienne TonB." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAJ089/document.
Повний текст джерелаАнотація:
La multiplication des résistances aux antibiothérapies actuelles et l’utilisation potentielle de bactéries pathogènes dans le cadre d’attentats bioterroristes rendent nécessaire la recherche de nouvelles cibles biologiques et la découverte de nouvelles stratégies antibiotiques. Dans ce contexte, les mécanismes d’assimilation du fer chez les bactéries à Gram négatif sont des cibles particulièrement prometteuses. Le fer est en effet un élément essentiel à la vie, mais peu biodisponible. Les bactéries ont donc développé des mécanismes efficaces pour subvenir à leurs besoins en fer. Ces mécanismes de transport nécessitent un apport d’énergie fourni par une machinerie bactérienne complexe, la machinerie TonB. La protéine TonB, qui joue un rôle central dans le fonctionnement de cette machinerie, est la cible de notre approche. Nous souhaitons séquestrer cette protéine dans le périplasme grâce à des composés peptidiques fonctionnalisés par des hétérocycles de type isoindole ou 1,2,4-triazine. La conception et la synthèse de ces molécules sont présentées dans ce manuscrit, ainsi que leurs perspectives de vectorisation en utilisant une stratégie dite du "cheval de Troie". Notre contribution à la mise au point d’un test d’affinité in vitro est également abordéeThe increasing resistances to the current antibiotherapies, and the potential use of pathogenic bacteria as biological weapons led us to the absolute necessity of discovering new biological targets and new antibiotic strategies. In this context, iron uptake pathways of Gram negative bacteria are promising targets. Indeed, iron is an essential nutrient, but it has a low bioavailability. Bacteria have developed efficient iron uptake pathways in order to proliferate. Iron is transported in the bacterial cell by specific outer membrane transporters and thanks to the energy provided by a complex molecular machinery, called TonB. The TonB protein, which is the keystone of this machinery, is a key target for the development of new antibiotics. We would like to sequester this protein in the periplasm thanks to molecules constituted of a peptidic moiety and a heterocyclic moiety such as isoindole or 1,2,4-triazine. The conception and the synthesis of these compounds are presented in this document, as well as their possibilities to be vectorized using a “Trojan Horse” strategy. Our contribution to the development of an in vitro test of affinity is presented as well
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Such, Sanmartin Gerard. "Assessing human growth hormone variants to determine their potential relevance in anti-doping and clinical analysis." Doctoral thesis, Universitat Pompeu Fabra, 2010. http://hdl.handle.net/10803/7198.
Повний текст джерелаАнотація:
Human growth hormone (GH) participates in human longitudinal growth, lipid and carbohydrate metabolism, and comprises a remarkably number of proteins with similar sequences, generated either genetically or post-translationally, that in some cases show clearly differentiated biological activities. Current methods employed for its quantification are mainly based on a specific immunodetection of the most concentrated GH variants in blood circulation. However, it is not clear neither which variants are recognised in each case, nor which is the real concentration of some of these variants. Probably related, present immunoassays show a disparity of results between them that difficults the comparison of data from different assays, with direct consequences in the clinical field. Within a doping context, the illegal administration of recombinant GH constitutes a complex challenge, given the fact that the pharmaceutical variant and the native 22 kDa GH variant do not show any structural difference that allows a direct detection. However, the administration of the pharmaceutical inhibits the natural production of the hormone, resulting in modifications between the relative concentration of some of these variants. In this case, which variants are detected is of utmost importance, since these constitute the base of this anti-GH doping method. Here, the relevance of some GH variants is addressed, including their generation, characterisation, analysis through specific antibodies and their detection on biological samples.L'hormona de creixement humana (GH) participa en el creixement post-longitudinal i en el metabolisme de lípids i carbohidrats, i comprèn un extraordinari nombre de proteïnes de seqüències similars, generades tant genèticament com posttranslacional, que en alguns casos mostren activitats biològiques clarament diferenciades. Els mètodes actuals emprats per la seva quantificació es basen principalment en una immunodetecció específica de les variants de GH més concentrades en circulació sanguínia. Tanmateix, no resta clar quines variants es reconeixen en cada cas, ni quina és la concentració real d'algunes d'aquestes variants. Possiblement relacionat, els immunoassaigs actualment utilitzats mostren una disparitat de resultats que dificulten la comparació de dades d'assaigs diferents, amb conseqüències directes en el camp clínic. Dins d'un context de dopatge, l'administració il·legal de GH recombinant constitueix un desafiament complex, donat el fet que la variant farmacèutica i la variant de GH nativa de 22 kDa no mostren cap diferència que permeti una detecció directa. No obstant, l'administració del medicament farmacèutic inhibeix la producció natural de la hormona, derivant en canvis entre la concentració relativa d'algunes d'aquestes variants. En aquest cas, és de màxima importància quines variants són detectades, ja que això constitueix la base d'aquest mètode d'antidopatge de GH. Aquí, s'estudia la rellevància d'algunes variants de GH, incloent-hi la seva generació, caracterització, anàlisi via anticossos específics i la seva detecció en mostres biològiques.
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Liu, Wei. "Light manipulation by plasmonic nanostructures." Phd thesis, 2013. http://hdl.handle.net/1885/10308.
Повний текст джерелаАнотація:
This thesis studies various effects based on the excitation of surfaces plasmons in various plasmonic nanostructures. We start the thesis with a general introduction of the field of plasmonics in Chapter 1. In this chapter we discuss both propagating surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs), how they are related to each other through the Bohr condition, the features of subwavelength confinement and near-field enhancement, and wave guidance through coupled LSPs. Then after the discussion of the achievements and challenges in this field (Section 1.3) we will outline the basic structure of the thesis at the end of this chapter (Section 1.4). In Chapter 2 we demonstrate a new mechanism to achieve complete spectral gap without periodicity along propagation direction based on the coupling of backward and forward modes supported by plasmonic nanostructures. We study the backward modes in single cylindrical plasmonic structures (Section 2.2) and focus on the two simplest cases: nanowires and nanocavities. Afterwards, we demonstrate how to achieve spectral gaps in coupled plasmonic nanocavities (Section 2.3). A polarization-dependent spectral gap is achieved firstly in two coupled nanocavities which support forward and backward modes respectively (Section 2.3.1). At the end we demonstrate a complete spectral gap, which is induced by the symmetry of a four-coupled-nanocavity system (Section 2.3.2). In Chapter 3 we study beam shaping in plasmonic potentials. Based on the similarity between Schrodinger equation for matter waves and paraxial wave equation for photons, we introduce the concept of plasmonic potentials and demonstrate how to obtain different kinds of potentials for SPPs in various modulated metal-dielectric-metal (MDM) structures. We investigate firstly the parabolic potentials in quadratically modulated MDM and the beam manipulations in such potentials, including polychromatic nanofocusing in full parabolic potentials (Section 3.2.1), plasmonic analogue of quantum paddle balls in half parabolic potentials (Section 3.2.2), and adiabatic nanofocusing in tapered parabolic potentials (Section 3.2.3). In the following section (Section 3.3) we show the existence of linear plasmonic potentials in wedged MDM and efficient steering of the Airy beams in such potentials (Section 3.3.2) after a brief introduction on Airy beams in free space (Section 3.3.1). In Chapter 4 we study scattering engineering by magneto-dielectric core-shell nanostructures. The introduction part (Section 4.1) gives a brief overview on the scattering of solely electric dipole (ED) or magnetic dipole (MD), and how the coexistence and interference of the ED and the MD can bring extra flexibility for scattering shaping. Afterwards, we discuss the scattering shaping by core-shell nanostructures through the interferences of electric and artificial magnetic dipoles (Section 4.2), including two examples of broadband unidirectional scattering by core-shell nanospheres (Section 4.2.1) and efficient scattering pattern shaping of core-shell nanowires (Section 4.2.2). At the end of this chapter we demonstrate polarization independent Fano resonances in arrays of core-shell nanospheres (Section 4.3.2). At the end of this thesis (Chapter 5) we summarize the results and draw the conclusions. We also discuss the challenges and possible future developments of the field of plasmonics.
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"Optical Methods for Studying Cell Mechanics." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.38730.
Повний текст джерелаАнотація:
abstract: Mechanical properties of cells are important in maintaining physiological functions of biological systems. Quantitative measurement and analysis of mechanical properties can help understand cellular mechanics and its functional relevance and discover physical biomarkers for diseases monitoring and therapeutics.
This dissertation presents a work to develop optical methods for studying cell mechanics which encompasses four applications. Surface plasmon resonance microscopy based optical method has been applied to image intracellular motions and cell mechanical motion. This label-free technique enables ultrafast imaging with extremely high sensitivity in detecting cell deformation. The technique was first applied to study intracellular transportation. Organelle transportation process and displacement steps of motor protein can be tracked using this method. The second application is to study heterogeneous subcellular membrane displacement induced by membrane potential (de)polarization. The application can map the amplitude and direction of cell deformation. The electromechanical coupling of mammalian cells was also observed. The third application is for imaging electrical activity in single cells with sub-millisecond resolution. This technique can fast record actions potentials and also resolve the fast initiation and propagation of electromechanical signals within single neurons. Bright-field optical imaging approach has been applied to the mechanical wave visualization that associated with action potential in the fourth application. Neuron-to-neuron viability of membrane displacement was revealed and heterogeneous subcellular response was observed.
All these works shed light on the possibility of using optical approaches to study millisecond-scale and sub-nanometer-scale mechanical motions. These studies revealed ultrafast and ultra-small mechanical motions at the cellular level, including motor protein-driven motions and electromechanical coupled motions. The observations will help understand cell mechanics and its biological functions. These optical approaches will also become powerful tools for elucidating the interplay between biological and physical functions.Dissertation/Thesis
Doctoral Dissertation Electrical Engineering 2016
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Mowbray, Duncan John. "Hydrodynamic Modelling of the Electronic Response of Carbon Nanotubes." Thesis, 2007. http://hdl.handle.net/10012/2723.
Повний текст джерелаАнотація:
The discovery of carbon nanotubes by Iijima in 1991 has created a torrent of new research activities. Research on carbon nanotubes ranges from studying their fundamental properties, such as their electron band structure and plasma frequencies, to developing new applications,
such as self-assembled nano-circuits and field emission displays. Robust models are now needed to enable a better understanding of the electronic response of carbon nanotubes. We use time-dependent density functional theory to derive a two-fluid two-dimensional (2D)
hydrodynamic model describing the collective response of a multiwalled carbon nanotube with dielectric media embedded inside or surrounding the nanotube.
We study plasmon hybridization of the nanotube system in the UV range, the stopping force for ion channelling, the dynamical image potential for fast ions, channelled diclusters and point dipoles, and the energy loss for ions with oblique trajectories. Comparisons are made of results obtained from the 2D hydrodynamic model with those obtained from an extension of the 3D Kitagawa model to
cylindrical geometries.
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Liao, Chung-Chi, and 廖崇吉. "Properties of coupled surface plasmon polaritons in metal-dielectric-metal structures and their potential application in opto-electronic devices." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/44547676271748911915.
Повний текст джерелаАнотація:
博士國立臺灣科技大學
電子工程系
102
In this thesis, the properties of surface plasmon-polaritons (SPPs) in symmetrical metal-dielectric-metal (MDM) structures were investigated and their applications in opto-electronic devices were realized. The numerically obtained dispersion relations are found to be highly tunable by varying the dielectric thickness and to cross the left of air light line, which indicates the SPPs are radiative in specific condition. The emission properties of an organic layer embedded in a metal-organic-metal (MOM) structure were investigated. Because of the competition by the radiative SPW in MOM structure, the population of excitons that recombine to form non-radiative SPW should be reduced. This may account for why the MOM sample photoluminescence peak intensity is about four times that of the single-metal sample. In addition, due to simultaneous excitation of the organic fluorescence emission and the radiative SPPs in MOM sample and the latter emission wavelength is tunable by varying the middle organic layer thickness, the color-tunable mixed photoluminescence form MOM sample were hence achieved. A surface plasmon resonance (SPR) scheme with prism/metal/dielectric/metal/analyte structure was developed. The surface plasma wave (SPW) dispersion curves within the MDM structure can be controlled by tuning the dielectric layer thickness. Therefore, the properties of the SPWs on the sensing surface of the SPR sensor can be tuned by coupling between them. The proposed tuning procedure was based on the tendency for anticrossing formation to occur between two non-parallel dispersion curves, and the reduction in the angular dip widths of the SPR sensors using the proposed procedure was demonstrated both numerically and experimentally. In addition, two surface plasma resonant modes are simultaneously excited in the SPR sensor. One of them is highly sensitive to the change in the optical constant of analyte, while the other is barely influenced by that change and then can be a reference signal to remove any drift caused by mechanical and physical disturbance. Thus, we may obtain a stable, real signal from the differential output between them.
Книги з теми "Plasmonic potentials"
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Horing, Norman J. Morgenstern. Random Phase Approximation Plasma Phenomenology, Semiclassical and Hydrodynamic Models; Electrodynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0010.
Повний текст джерелаАнотація:
Chapter 10 reviews both homogeneous and inhomogeneous quantum plasma dielectric response phenomenology starting with the RPA polarizability ring diagram in terms of thermal Green’s functions, also energy eigenfunctions. The homogeneous dynamic, non-local inverse dielectric screening functions (K) are exhibited for 3D, 2D, and 1D, encompassing the non-local plasmon spectra and static shielding (e.g. Friedel oscillations and Debye-Thomas-Fermi shielding). The role of a quantizing magnetic field in K is reviewed. Analytically simpler models are described: the semiclassical and classical limits and the hydrodynamic model, including surface plasmons. Exchange and correlation energies are discussed. The van der Waals interaction of two neutral polarizable systems (e.g. physisorption) is described by their individual two-particle Green’s functions: It devolves upon the role of the dynamic, non-local plasma image potential due to screening. The inverse dielectric screening function K also plays a central role in energy loss spectroscopy. Chapter 10 introduces electromagnetic dyadic Green’s functions and the inverse dielectric tensor; also the RPA dynamic, non-local conductivity tensor with application to a planar quantum well. Kramers–Krönig relations are discussed. Determination of electromagnetic response of a compound nanostructure system having several nanostructured parts is discussed, with applications to a quantum well in bulk plasma and also to a superlattice, resulting in coupled plasmon spectra and polaritons.
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Horing, Norman J. Morgenstern. Interacting Electron–Hole–Phonon System. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0011.
Повний текст джерелаАнотація:
Chapter 11 employs variational differential techniques and the Schwinger Action Principle to derive coupled-field Green’s function equations for a multi-component system, modeled as an interacting electron-hole-phonon system. The coupled Fermion Green’s function equations involve five interactions (electron-electron, hole-hole, electron-hole, electron-phonon, and hole-phonon). Starting with quantum Hamilton equations of motion for the various electron/hole creation/annihilation operators and their nonequilibrium average/expectation values, variational differentiation with respect to particle sources leads to a chain of coupled Green’s function equations involving differing species of Green’s functions. For example, the 1-electron Green’s function equation is coupled to the 2-electron Green’s function (as earlier), also to the 1-electron/1-hole Green’s function, and to the Green’s function for 1-electron propagation influenced by a nontrivial phonon field. Similar remarks apply to the 1-hole Green’s function equation, and all others. Higher order Green’s function equations are derived by further variational differentiation with respect to sources, yielding additional couplings. Chapter 11 also introduces the 1-phonon Green’s function, emphasizing the role of electron coupling in phonon propagation, leading to dynamic, nonlocal electron screening of the phonon spectrum and hybridization of the ion and electron plasmons, a Bohm-Staver phonon mode, and the Kohn anomaly. Furthermore, the single-electron Green’s function with only phonon coupling can be rewritten, as usual, coupled to the 2-electron Green’s function with an effective time-dependent electron-electron interaction potential mediated by the 1-phonon Green’s function, leading to the polaron as an electron propagating jointly with its induced lattice polarization. An alternative formulation of the coupled Green’s function equations for the electron-hole-phonon model is applied in the development of a generalized shielded potential approximation, analysing its inverse dielectric screening response function and associated hybridized collective modes. A brief discussion of the (theoretical) origin of the exciton-plasmon interaction follows.
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Horing, Norman J. Morgenstern. Retarded Green’s Functions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0005.
Повний текст джерелаАнотація:
Chapter 5 introduces single-particle retarded Green’s functions, which provide the probability amplitude that a particle created at (x, t) is later annihilated at (x′,t′). Partial Green’s functions, which represent the time development of one (or a few) state(s) that may be understood as localized but are in interaction with a continuum of states, are discussed and applied to chemisorption. Introductions are also made to the Dyson integral equation, T-matrix and the Dirac delta-function potential, with the latter applied to random impurity scattering. The retarded Green’s function in the presence of random impurity scattering is exhibited in the Born and self-consistent Born approximations, with application to Ando’s semi-elliptic density of states for the 2D Landau-quantized electron-impurity system. Important retarded Green’s functions and their methods of derivation are discussed. These include Green’s functions for electrons in magnetic fields in both three dimensions and two dimensions, also a Hamilton equation-of-motion method for the determination of Green’s functions with application to a 2D saddle potential in a time-dependent electric field. Moreover, separable Hamiltonians and their product Green’s functions are discussed with application to a one-dimensional superlattice in axial electric and magnetic fields. Green’s function matching/joining techniques are introduced and applied to spatially varying mass (heterostructures) and non-local electrostatics (surface plasmons).
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Horing, Norman J. Morgenstern. Superfluidity and Superconductivity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0013.
Повний текст джерелаАнотація:
Chapter 13 addresses Bose condensation in superfluids (and superconductors), which involves the field operator ψ having a c-number component (<ψ(x,t)>≠0), challenging number conservation. The nonlinear Gross-Pitaevskii equation is derived for this condensate wave function<ψ>=ψ−ψ˜, facilitating identification of the coherence length and the core region of vortex motion. The noncondensate Green’s function G˜1(1,1′)=−i<(ψ˜(1)ψ˜+(1′))+> and the nonvanishing anomalous correlation function F˜∗(2,1′)=−i<(ψ˜+(2)ψ˜+(1′))+> describe the dynamics and elementary excitations of the non-condensate states and are discussed in conjunction with Landau’s criterion for viscosity. Associated concepts of off-diagonal long-range order and the interpretation of <ψ> as a superfluid order parameter are also introduced. Anderson’s Bose-condensed state, as a phase-coherent wave packet superposition of number states, resolves issues of number conservation. Superconductivity involves bound Cooper pairs of electrons capable of Bose condensation and superfluid behavior. Correspondingly, the two-particle Green’s function has a term involving a product of anomalous bound-Cooper-pair condensate wave functions of the type F(1,2)=−i<(ψ(1)ψ(2))+>≠0, such that G2(1,2;1′,2′)=F(1,2)F+(1′,2′)+G˜2(1,2;1′,2′). Here, G˜2 describes the dynamics/excitations of the non-superfluid-condensate states, while nonvanishing F,F+ represent a phase-coherent wave packet superposition of Cooper-pair number states and off-diagonal long range order. Employing this form of G2 in the G1-equation couples the condensed state with the non-condensate excitations. Taken jointly with the dynamical equation for F(1,2), this leads to the Gorkov equations, encompassing the Bardeen–Cooper–Schrieffer (BCS) energy gap, critical temperature, and Bogoliubov-de Gennes eigenfunction Bogoliubons. Superconductor thermodynamics and critical magnetic field are discussed. For a weak magnetic field, the Gorkov-equations lead to Ginzburg–Landau theory and a nonlinear Schrödinger-like equation for the pair wave function and the associated supercurrent, along with identification of the Cooper pair density. Furthermore, Chapter 13 addresses the apparent lack of gauge invariance of London theory with an elegant variational analysis involving re-gauging the potentials, yielding a manifestly gauge invariant generalization of the London equation. Consistency with the equation of continuity implies the existence of Anderson’s acoustic normal mode, which is supplanted by the plasmon for Coulomb interaction. Type II superconductors and the penetration (and interaction) of quantized magnetic flux lines are also discussed. Finally, Chapter 13 addresses Josephson tunneling between superconductors.
Частини книг з теми "Plasmonic potentials"
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Ross, Daniel J., Nicholas P. W. Pieczonka, and R. F. Aroca. "The Role of Plasmonic Engineering in Potential Surface-Enhanced Fluorescence." In Metal-Enhanced Fluorescence, 67–90. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470642795.ch3.
Повний текст джерела
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Padmalaya, G., E. Manikandan, S. Radha, B. S. Sreeja, and P. Senthil Kumar. "Patterned 2D Thin Films Topological Insulators for Potential Plasmonic Applications." In Advanced Topological Insulators, 361–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2019. http://dx.doi.org/10.1002/9781119407317.ch10.
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Nagasawa, Fumika. "Electronic Excitation of an Isolated Single-Walled Carbon Nanotube by Tuning Electrochemical Potential." In Studies on the Plasmon-Induced Photoexcitation Processes of Molecules on Metal Surfaces, 37–45. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56579-6_4.
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Aamir Iqbal, Muhammad, Maria Malik, Wajeehah Shahid, Waqas Ahmad, Kossi A. A. Min-Dianey, and Phuong V. Pham. "Plasmonic 2D Materials: Overview, Advancements, Future Prospects and Functional Applications." In Nanostructured Materials - Classification, Growth, Simulation, Characterization, and Devices [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101580.
Повний текст джерелаАнотація:
Plasmonics is a technologically advanced term in condensed matter physics that describes surface plasmon resonance where surface plasmons are collective electron oscillations confined at the dielectric-metal interface and these collective excitations exhibit profound plasmonic properties in conjunction with light interaction. Surface plasmons are based on nanomaterials and their structures; therefore, semiconductors, metals, and two-dimensional (2D) nanomaterials exhibit distinct plasmonic effects due to unique confinements. Recent technical breakthroughs in characterization and material manufacturing of two-dimensional ultra-thin materials have piqued the interest of the materials industry because of their extraordinary plasmonic enhanced characteristics. The 2D plasmonic materials have great potential for photonic and optoelectronic device applications owing to their ultra-thin and strong light-emission characteristics, such as; photovoltaics, transparent electrodes, and photodetectors. Also, the light-driven reactions of 2D plasmonic materials are environmentally benign and climate-friendly for future energy generations which makes them extremely appealing for energy applications. This chapter is aimed to cover recent advances in plasmonic 2D materials (graphene, graphene oxides, hexagonal boron nitride, pnictogens, MXenes, metal oxides, and non-metals) as well as their potential for applied applications, and is divided into several sections to elaborate recent theoretical and experimental developments along with potential in photonics and energy storage industries.
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Emam, Ahmed Nabile, Ahmed Sadek Mansour, Emad Girgis, and Mona Bakr Mohamed. "Hybrid Plasmonic Nanostructures." In Pharmaceutical Sciences, 1193–211. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1762-7.ch046.
Повний текст джерелаАнотація:
Plasmonic hybrid nanostructure including Semiconductor-metallic nanoparticles, and graphene-plasmonic nanocomposites have great potential to be used as photocatalyst for hydrogen production and for photodegradation of organic waste. Also, they are potential candidate as active materials in photovoltaic devices. Plasmonic-magnetic nanocomposites could be used in photothermal therapy and biomedical imaging. This chapter will focus on the environmental impact of these materials and their in-vitro and in-vivo toxicity. In addition, the applications of these hybrid nanostructures in energy and environment will be discussed in details.
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Hlali, Aymen, and Hassen Zairi. "Non-Reciprocal Series-Fed Microstrip Patch Antenna Array Based on Graphene-Black Phosphorus for THz Applications Using the Iterative Method." In Handbook of Research on 5G Networks and Advancements in Computing, Electronics, and Electrical Engineering, 165–80. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-6992-4.ch006.
Повний текст джерелаАнотація:
Two-dimensional materials have already demonstrated their potential in electronic applications. In this chapter, the authors propose and investigate a non-reciprocal series-fed microstrip patch antenna array based on graphene-black phosphorus for THz applications. The modeling and simulation of this structure are made with the wave concept iterative process method, in which the 2D materials are incorporated as conductive surface boundaries. Combining the advantages of graphene and BP, the antenna exhibits both strong anisotropic and plasmon responses that are not available in either individual graphene or black phosphorus layer. The authors envision that this strategy of hybridization of graphene and BP may pave the way towards non-reciprocal plasmonic components with enhanced functionalities at THz band with important applications in imaging and communications.
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Kavitha S, K. V. S. S. S. S. Sairam, and Ashish Singh. "Substrate Effects on the Plasmonic Resonance of Graphene Nano-Antenna." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde221098.
Повний текст джерелаАнотація:
In this manuscript, a pentagon shaped plasmonic graphene nano patch antenna is designed and investigated on silicon dioxide, silicon nitride and zinc oxide substrates. The optical characteristics of the graphene such as conductivity and permittivity are analyzed at various values of chemical potential using Kubo conductivity model. The plasmonic resonance of the proposed nano-antenna is analyzed through the graphene chemical potential varied in the span from 0.0 eV to 2.0 eV. It is observed that the proposed pentagon shaped graphene nano patch antenna shows good plasmonic resonance characteristics at 29.8750 THz with the reflection coefficient of -27.4153 dB, 91.5650 THz with -27.5179 dB and 853.7350 THz with -40.3267 dB on silicon dioxide, zinc oxide and silicon nitride substrates respectively. These optimum characteristics are observed at the chemical potential values 2.00 eV and 0.50 eV for the proposed graphene nano patch antenna.
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Papafilippou, Lana, and Marilena Hadjidemetriou. "The Nanoparticle Biomolecule Corona and Potential Biomedical Applications." In World Scientific Reference on Plasmonic Nanomaterials, 73–99. World Scientific, 2022. http://dx.doi.org/10.1142/9789811235245_0003.
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Hoang Nam, Nguyen. "Multifunctional Silver Nanoparticles: Synthesis and Applications." In Silver Micro-Nanoparticles - Properties, Synthesis, Characterization, and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96712.
Повний текст джерелаАнотація:
Multifunctional silver nanoparticles have attracted widely due to their potential applications. Based on the properties of individual silver nanoparticles, such as plasmonic and antibacterial properties, silver nanoparticles can become multifunctional by surface modifications with various surfactants or they can be combined in core-shell and composite structures with the magnetic nanoparticles to form bifunctional nanoparticles. After reviewing the methods of synthesis and applications of silver nanoparticles, the chapter describes the synthesis and the properties of the new types of multifunctional silver nanomaterials based on the plasmonic behaviors of silver nanoparticles and the iron oxide Fe3O4 superparamagnetic nanoparticles. One type is a simple combination of silver nanoparticles and iron oxide nanoparticles in a silica matrix Fe3O4/Ag-4ATP@SiO2. Other types are the core-shell structured nanoparticles, where Fe3O4 nanoparticles play as the core and silver nanoparticles are the outer shell, so-called Fe3O4@SiO2-Ag and Fe3O4-Ag. In the Fe3O4@SiO2-Ag, silver nanoparticles are reduced on the surface of silica-coated magnetic core, while in Fe3O4-Ag, silver nanoparticles are directly reduced on the amino groups functionalized on the surface of magnetic nanoparticles without coating with silica. Both of types of the multifunctional silver nanoparticles show the plasmonic and magnetic properties similar as the individual silver and iron oxide nanoparticles. Finally, some applications of those multifunctional silver nanoparticles will be discussed.
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Malik, Maria, Muhammad Aamir Iqbal, Wajeehah Shahid, Syed Zaheer Ud Din, Mujtaba Ikram, Nadia Anwar, Samiah Shahid, and Faryal Idrees. "Overview of Liquid Crystal Research: Computational Advancements, Challenges, Future Prospects and Applications." In Liquid Crystals [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101417.
Повний текст джерелаАнотація:
Liquid crystal (LC) is a fascinating state of matter that combines order and mobility at multiple hierarchical levels, spanning from nanoscale to the macroscale, or from molecular to the macroscopic, and is composed of molecules and layers as thin as of a few nanometer in size. This unique combination allows such a system to adapt to a wide range of external stimuli, including temperature, magnetic field, electric field, mechanical stress, light, chemical reaction, and electrochemical response, by determining a new lowest energy configuration. Liquid crystalline nanostructures efficiently transmit and amplify information and attributes over macroscopic sizes due to their dynamic nature. The responsiveness and diversity of LCs provide enormous potential and challenges for fundamental scientific insights as well as opening the door to countless applied applications. Recent breakthroughs in nanotechnology have boosted the discipline, both in terms of theoretical simulations and the ability to fabricate nanoscale structures such as sub-wavelength gratings, nanoporous materials, and nanoparticles. Because LC materials are switchable, a new family of active plasmonic and nanophotonic devices is emerging, describing fascinating basic research processes as well as the creation of upgraded devices. This chapter discusses the fundamentals, computational advances, future prospects and challenges, as well as potential applications of LCs.
Тези доповідей конференцій з теми "Plasmonic potentials"
1
Yu, Min-Wen, Satoshi Ishii, Shisheng Li, Ji-Ren Ku, Jhen-Hong Yang, Kuan-Lin Su, Takaaki Taniguchi, Tadaaki Nagao, and Kuo-Ping Chen. "Observation of carrier transports at exciton-plasmon coupling in MoS2 monolayers and 1D plamsmonic nanogrooves." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2021. http://dx.doi.org/10.1364/jsap.2021.10a_n404_6.
Повний текст джерелаАнотація:
Two-dimensional transition metal dichalcogenides (TMDCs) have studied intensively owing to their unique optical and electronic properties [1]. Among TMDCs, monolayer molybdenum disulfide (MoS2) is a direct bandgap semiconductor with strong binding energies which make it as a perfect candidate for light-matter coupling system. In the current work, we fabricated hybrid systems of MoS2 monolayers [2] and 1D plasmonic nanogrooves made of gold (Au) to study exciton-plasmon coupling, particularly the carrier transport at the coupling state (see Fig. 1(a)). The nanogrooves were suited to excite in-plane plasmons, which are different from metallic-nanoparticle-on-mirror configuration.(/p)(p)The exciton-plasmon couplings were confirmed by the reflectance measurements and the dispersion relations were plotted from the reflectance measurements as shown in Fig. 1(b). In Fig. 1(b), the plasmon-exciton coupling of the upper polariton and lower polariton were plotted as a function of detuning. The splitting energy was as large as 65 meV, which is one of the largest among the values reported so far at room temperature. The exciton-plasmon coupling has also been confirmed by the Kelvin probe force microscope (KPFM) which recorded the surface potentials. As shown in Fig. 1(c), while there was no surface potential change for the MoS2 on planar Au film, a surface potential shift of 13.5 meV was observed for the MoS2 on nanogroove upon laser irradiation at 532 nm. This is a direct evidence that surface potential shift was induced at the exciton-plasmon coupling. Our results indicated that the 1D plasmonic nanogrooves are appropriate structures to study exciton-plasmon coupling with large splitting energy at room temperature.
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Wei Liu, Dragomir N. Neshev, Ilya V. Shadrivov, Andrey E. Miroshnichenko, and Yuri S. Kivshar. "Plasmonic Airy beam manipulation by linear optical potentials." In 12th European Quantum Electronics Conference CLEO EUROPE/EQEC. IEEE, 2011. http://dx.doi.org/10.1109/cleoe.2011.5943598.
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Wei, Jianjun, Hongjun Song, Sameer Singhal, Matthew Kofke, Madu Mendis, and David Waldeck. "An In-Plane Nanofluidic Nanoplasmonics-Based Platform for Biodetection." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75206.
Повний текст джерелаАнотація:
This paper reports a new nanofluidic plasmonics-based sensing platform which can be readily integrated with microfluidics devices, and potentially enable an in-parallel transmission surface plasmon resonance (SPR), lab-on-chip sensing technology. The technology overcomes the current SPR size limitations through a combination of nanofluidics and nanoplasmonics in a rationally designed in-plane nanoslit array capable of concurrent plasmonic sensing and confined-flow for analyte delivery. This work is leveraged on our previous work of using nanoslit metal films for SPR sensing [1, 2], and the in-plane nanofluidic nanoplasmonic platform is different from recently reported nanohole-based nanofluidic plasmonics sensors [3, 4]. The work presented here includes an integrated device with nanofluidic nanoplasmonic arrays interfacing with microfluidic channels, and preliminary findings, from both theoretical and experimental fronts, of the device for bio-sensing.
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Cho, Sangyeon, Yi Yang, Marin Soljačić, and Seok Hyun Yun. "Efficient plasmonic lasing from submicron-sized visible perovskite particle on gold substrate." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4a.85.
Повний текст джерелаАнотація:
Utilizing surface plasmon polaritons (SPPs) is one of the most promising ways to miniaturize lasers into subwavelength-scale. Despite its potential, it has been challenging to make a plasmonic laser having a sub-micrometer scale in all three dimensions due to large cavity loss. Here, we demonstrate single-particle lasing around 540 nm with full-submicron, cesium lead bromide perovskite (CsPbBr3) crystals atop polymer-coated gold substrates at room temperature. With a large number (~100) of devices, we systematically study the lasing action of plasmonic test and photonic control groups. The achieved smallest plasmonic laser was 0.56 μm × 0.58 μm ×0.32 μm in size, ten-fold smaller than that of our smallest photonic laser. Key elements to efficient plasmonic lasing are identified as enhanced optical gain by the Purcell effect, long carrier diffusivity, a large spontaneous emission factor, and a high group index. Our results shed light on the three-dimensional miniaturization of plasmonic lasers.
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Dayal, Govind, Ikki Morichika, and Satoshi Ashihara. "Vibrational strong coupling between molecular vibration and subwavelength plasmonic cavity supporting gap plasmon mode." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2019. http://dx.doi.org/10.1364/jsap.2019.18a_e208_2.
Повний текст джерелаАнотація:
We report on strong coupling between molecular vibrational resonances of polymethyl methacrylate (PMMA) molecules and gap plasmon resonance of an ultrathin plasmonic cavity in the midinfrared range. The strong coupling is achieved when the molecular vibrational mode and plasmonic cavity exchange energy faster than their relaxation rates and it is maximum when two relaxation rates are equal [1]. In this work, we designed, fabricated and characterized a composite medium consisting of a thin PMMA layer sandwiched between the nanoantenna array and a continuous metallic thin film to achieve vibration strong coupling. The spectral position and the relaxation rate of gap plasmonic resonance are tuned through the molecular resonance of the PMMA molecules (at 1730 cm−1) to go from weak to strong coupling regime. Strong coupling between vibrational modes and gap plasmon mode leads to the formation of new hybrid light-matter states called polaritonic states (@ 1690 cm−1 & 1810 cm−1), separated by the vacuum Rabi splitting (120 cm−1). Thin film coupled nanoantennas with sub-wavelength gaps have shown great potential in nanophotonic applications because they offer the ultimate electric field confinement in the gap. Our work is complementary to earlier work using microcavities and provides a new approach to achieve strong coupling with a nanoscale plasmonic cavity (λ/25) and the possibility to modulate the strong coupling regime by changing the gap thickness of the cavity and the lattice period of the nanoantenna array.
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Kim, Donghyun. "Investigation of Multiscale Biomolecular Dynamics with Plasmonic Nanoapertures." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2019. http://dx.doi.org/10.1364/jsap.2019.18a_e208_1.
Повний текст джерелаАнотація:
Optical molecular imaging and sensing techniques based on light localization are explored. The creation of locally amplified electromagnetic near-fields on surface plasmon-enhanced metallic nanoarray structures has been investigated in many studies because of the potential for extreme light confinement to improve molecular detection sensitivity and resolving power for imaging processes that would be typically impossible to observe under the diffraction limit. By colocalization of light-matter distribution using plasmonic nanoaperture arrays, it was shown that improvement of detection sensitivity by several orders of magnitude would be plausible. For imaging, although many emerging microscopy approaches have been highly successful to produce super-resolved images beyond imagination, we explore alternative techniques based on plasmonic nanoarrays by which achievable resolution may be customized to fit specific imaging needs.
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Zheng, Yue Bing, Bala Krishna Juluri, and Tony Jun Huang. "Fabrication and Applications of Long-Range Ordered Au Nanodisk Arrays." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67593.
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Large-scale nanostructure arrays with spatial coherence are useful for many applications. Conventional nanofabrication techniques such as electron beam lithography and focused ion beam lithography are expensive and time-consuming. In this paper, long-range ordered Au nanodisk arrays were fabricated on glass substrates using nanosphere lithography (NSL) combined with reactive ion etching (RIE) techniques. The morphology and size distribution of the Au nanodisks were examined with scanning electron microscopy (SEM) and atomic force microscopy (AFM). The sensitivity of the localized surface plasmon resonance (LSPR) of the Au nanodisk arrays to change in the surroundings’ refractive index was evaluated by integrating the Au nanodisk arrays into microfluidic channels. The measured sensitivity was supported by discrete dipole approximation (DDA) calculations. Further, we designed and fabricated an all-optical plasmonic switch based on the Au nanodisk arrays and photoresponsive liquid crystals (LCs). The high-quality optical properties and high-degree spatial uniformity of the nanodisk arrays, together with simple, low-cost fabrication and easy integration with microfluidic system, suggest tremendous potential in using these nanostructures in many other applications, including biosensing and imaging, surface-enhanced Raman spectroscopy (SERS), and plasmonic tweezers.
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Yanagisawa, M., M. Kunimoto, and T. Homma. "Chemical Analysis of Ultra-Thin DLC Films and Lubricant/DLC Interface Using Plasmonic Sensors." In ASME 2014 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/isps2014-6908.
Повний текст джерелаАнотація:
The technical potential of a new plasmonic sensor, which can acquire surface-enhanced Raman spectra with high sensitivity by controlling surface plasmons is demonstrated for the chemical analysis of diamond-like carbon (DLC) films, lubricant films, and the DLC/lubricant interface on magnetic disks of sub-nanometer scale. The Raman spectra of thin DLC films and lubricated DLC carbon can be acquired with a high S/N ratio. Raman spectra of lubricated DLC carbon can also be acquired with the high S/N ratio. The wavenumber shift and intensity change of the Raman peaks of the phenyl and hydroxyl groups in the mixed lubricants (ADOH and Z-tetraol) show that the chemical interaction with the DLC surfaces of the phenyl group in the lubricant molecule decreases with increasing nitrogen content, whereas that of the hydroxyl group with the nitrogenated carbon increases. Raman spectra of nitrogenated DLC films are also acquired, the peaks show good agreement with density functional theory calculations. The calculated bonding energy indicates that the hydroxyl groups interact with the nitrogenated carbon.
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Du, Zhidong, Chen Chen, and Liang Pan. "Plasmonic Nanofocusing in Deep and Extreme Sub-Wavelength Scale for Scalable Nanolithography." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2680.
Повний текст джерелаАнотація:
Maskless nanolithography is an agile and cost effective approach if their throughputs can be scaled for mass production purposes. Using plasmonic nanolithography approach, direct pattern writing was successfully demonstrated with 22 nm half-pitch at high speed. Plasmonic nanolithography uses an array of plasmonic lenses to directly pattern features on a rotating substrate. Taking the advantage of air bearing surface techniques, the system can expose the wafer pixel by pixel with a speed of ∼10 m/s, much faster than any conventional scanning based lithography system. It is a low-cost, high-throughput maskless approach for the next generation lithography and also for the emerging nanotechnology applications, such as nanoscale metrology and imaging. A critical part of the PNL is to use plasmonic lens to deliver highly concentrated optical power at nanoscale. We have demonstrated such nanoscale process and achieved 22 nm resolution. Here, we report our recent efforts of designing new plasmonic nanofocusing structures that is capable of achieving optical confinement below 20 nm which can potentially support direct patterning at sub-10nm resolution.
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Wong, Jun Kai, Robert Taylor, Sungchul Baek, Yasitha Hewakuruppu, Xuchuan Jiang, and Chuyang Chen. "Temperature Measurements of a Gold Nanosphere Solution in Response to Light-Induced Hyperthermia." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66424.
Повний текст джерелаАнотація:
Gold nanospheres (GNSs), biocompatible nanoparticles that can be designed to absorb visible and near-infrared light, have shown great potential in induced thermal treatment of cancer cells via Plasmonic Photothermal Therapy (PPTT) [3]. In this study, light induced heating of a water-based dispersion of 20 nm diameter GNSs was investigated at their plasmon resonance wavelength (λ = 520 nm). Temperature changes of the solution at the point of light irradiation were measured experimentally. A heat transfer model was used to verify the experimental data. The effect of two key parameters, light intensity and particle concentration, on the solution’s temperature was investigated. The experimental results showed a significant temperature rise of the GNS solution compared to de-ionized water. The temperature rise of GNS solution was linearly proportional to the concentration of GNS (from 0.25–1.0 C, C = 1×1013 particles per ml) and the light intensity (from 0.25 to 0.5 W cm−2). The experimental data matches the modeling results adequately. Overall, it can be concluded that the hyperthermic ablation of cancer cells via GNS can be achieved by controlled by the light intensity and GNS concentration. A novel component of this study is that a high power lamp source was used instead of a high power laser. This means that only low cost components were used in the current experimental set-up. Moreover, by using suitable filters and white light from the high power lamp source, it is possible to obtain light in many wavelength bands for the study of other nanoparticles with different plasmon wavelength ranges. The current results represtent just one example in this versatile experimental set-up developed. It should be noted, however, the plasmon resonance wavelength used in this study is not within the therapeutic window (750–1300 nm) [13]. Therefore, the GNSs used in this experiment are only applicable to the surface induced thermal treatment of cancer cells, for instance, in the skin.