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Dissertations / Theses on the topic 'Light angular momentum'

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1

Cameron, Robert P. "On the angular momentum of light." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5849/.

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The idea is now well established that light possesses angular momentum and that this comes in two distinct forms, namely spin and orbital angular momentum which are associated with circular polarisation and helical phase fronts respectively. In this thesis, we explain that this is, in fact, a mere glimpse of a much larger picture: light possesses an infinite number of distinct angular momenta, the conservation of which in the strict absence of charge reflects the myriad rotational symmetries then inherent to Maxwell's equations. We recognise, moreover, that many of these angular momenta can be
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2

Vannier, dos santos borges Carolina. "Bell inequalities with Orbital Angular Momentum of Light." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00767216.

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We shall present a theoretical description of paraxial beams, showing the propagation modes that arise from the solution of the paraxial equation in free space. We then discuss the angular momentum carried by light beams, with its decomposition in spin and orbital angular momentum and its quantization. We present the polarization and transverse modes of a beam as potential degrees of freedom to encode information. We define the Spin-Orbit modes and explain the experimental methods to produce such modes. We then apply the Spin-Orbit modes to perform a BB84 quantum key distribution protocol with
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3

Vannier, Dos Santos Borges Carolina. "Bell inequalities with Orbital Angular Momentum of Light." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112225/document.

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Dans une première partie introductive, nous rappelons la description théorique de la propagation de faisceaux optiques en terme des modes solutions de l'équation de propagation dans l'approximation paraxialle. Dans ce cadre, nous présentons les notions de moment cinétique transporté par les faisceaux lumineux, et de sa décomposition en moment cinétique intrinsèque (ou spin) et en moment angulaire.La seconde partie est consacrée au codage de l'information dans les degrés de libertés de polarisation et de modes transverses des faisceaux optiques. Les modes spin-orbites sont définis et un disposi
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4

Gotte, Jorge Bernhard. "Integral and fractional orbital angular momentum of light." Thesis, University of Strathclyde, 2006. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26372.

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Orbital angular momentum of light is a new field of research which is concerned with the mechanical and optical effects of light with a helical phase structure. In this thesis we ask fundamental questions on the properties of light carrying orbital angular momentum. We discuss the uncertainty relation for angle and angular momentum on the example of orbital angular momentum of light. The lower bound in the angular uncertainty relation is state dependent, which requires a distinction between states satisfying the equality in the uncertainty relation and states giving a minimum in the uncertaint
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5

Neo, Richard. "Measuring the Orbital Angular Momentum of Light for Astronomy." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17718.

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While the story of optical orbital angular momentum (OAM) dates back to the development of Maxwell's equations, the study of photon OAM by the physics community begins in earnest in the 1990s, led in part by a paper by Allen et al. describing the independent control of spin and orbital angular momentum in paraxial modes of light. The recognition of the orbital angular momentum of light in astronomy is a much more recent affair. This thesis explores the role of the OAM of light in astronomy and attempts to make the case for the measurement of photon OAM as a new tool in astronomy. Two contrib
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6

Chang, Yuan-Pin. "Novel probes of angular momentum polarization." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:d3880edf-436a-415e-8a74-6b1c0fd26e65.

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New dynamical applications of quantum beat spectroscopy (QBS) to molecular dynamics are employed to probe the angular momentum polarization effects in photodissociation and molecular collisions. The magnitude and the dynamical behaviour of angular momentum alignment and orientation, two types of polarization, can be measured via QBS technique on a shot-by-shot basis. The first part of this thesis describes the experimental studies of collisional angular momentum depolarization for the electronically excited state radicals in the presence of the collider partners. Depolarization accompanies bot
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7

McLaren, Melanie. "Tailoring quantum entanglement of orbital angular momentum." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95868.

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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: High-dimensional quantum entanglement offers an increase in information capacity per photon; a highly desirable property for quantum information processes such as quantum communication, computation and teleportation. As the orbital angular momentum (OAM) modes of light span an infinite-dimensional Hilbert space, they have become frontrunners in achieving entanglement in higher dimensions. In light of this, we investigate the potential of OAM entanglement of photons by controlling the parameters in both the generation and m
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8

Gelbord, Todd Richard. "On the geometry and topology of the angular momentum of light." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/gelbord/GelbordT0510.pdf.

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The classical field theory approach to the angular momentum of light, specifically how it represents the spin angular momentum of light, has been a matter of controversy for some time. This thesis analyses the aforementioned approach from the point of view of the Exterior Calculus and de Rham Cohomology. It is found purely mathematically that the spin angular momentum of a circularly polarized plane wave of light must be identically zero. It is concluded that the classical formulation of the angular momentum of a plane wave of light is, on some level, incomplete.
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9

Padmabandu, Gamaralalage Gunasiri 1956. "Angular momentum of light and its mechanical effects on a birefringent medium." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276914.

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The torque exerted by a beam of polarized light on a half-wave plate which alters its state of polarization is calculated for several laser wavelengths and intensities using electromagnetic theory. The second-order torque that arises through the nonlinear interaction is formulated and the numerical values are calculated for the 42m crystal class. The experiment used to detect the existence of the torque is reviewed and a demonstration experiment is suggested.
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10

An, Fangzhao A. "Experimental Realization of Slowly Rotating Modes of Light." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/hmc_theses/53.

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Beams of light can carry spin and orbital angular momentum. Spin angular momentum describes how the direction of the electric field rotates about the propagation axis, while orbital angular momentum describes the rotation of the field amplitude pattern. These concepts are well understood for monochromatic beams, but previous theoretical studies have constructed polychromatic superpositions where the connection between angular momentum and rotation of the electric field becomes much less clear. These states are superpositions of two states of light carrying opposite signs of angular momentum an
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11

Chu, Jiaqi. "Orbital angular momentum encoding/decoding of 2D images for scalable multiview colour displays." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274903.

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Three-dimensional (3D) displays project 3D images that give 3D perceptions and mimic real-world objects. Among the rich varieties of 3D displays, multiview displays take advantage of light’s various degrees of freedom and provide some of the 3D perceptions by projecting 2D subsampling of a 3D object. More 2D subsampling is required to project images with smoother parallax and more realistic sensation. As an additional degree of freedom with theoretically unlimited state space, orbital angular momentum (OAM) modes may be an alternative to the conventional multiview approaches and potentially pr
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12

Magallanes, González Hernando. "Mechanical effects of light in presence of optical spin-orbit interaction." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0437.

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Des interactions entre la matière et la lumière sont à l'origine de phénomènes opto-mécaniques. L'une des caractéristiques distinctives de l'interaction lumière-matière est l'interaction spin-orbite de la lumière. Cette dernière s'étudie au sein d'un domaine de recherche émergent consacré à l'étude des effets opto-mécaniques en présence de l'interaction entre la polarisation et des degrés de liberté spatiaux de la lumière. En particulier, ce travail vise à observer directement la manifestation (i) des forces latérales et (ii) des couples optiques gauches qui sont des effets opto-mécaniques con
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13

Sponselli, Anna. "Study of the propagation and detection of the orbital angular momentum of light for astrophysical applications." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423356.

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The aim of this work is to study the propagation of orbital angular momentum (OAM) of light for astrophysical applications and a method for OAM detection with optical telescopes. The thesis deals with the study of the orbital angular momentum (OAM) as a new observable for astronomers, which could give additional information with respect to those already inferred from the analysis of the intensity, frequency and polarization of light. Indeed, the main purpose of this work is to highlight that light can have a much more complex structure, and therefore can transport much more information. In p
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14

Brunet, Charles. "Design and modeling of optical fibers for spatial division multiplexing using the orbital angular momentum of light." Doctoral thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/26996.

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Les besoins toujours croissants en terme de transfert de données numériques poussent au développement de nouvelles technologies pour accroître la capacité des réseaux, notamment en ce qui concerne les réseaux de fibre optique. Parmi ces nouvelles technologies, le multiplexage spatial permet de multiplier la capacité des liens optiques actuels. Nous nous intéressons particulièrement à une forme de multiplexage spatial utilisant le moment cinétique orbital de la lumière comme base orthogonale pour séparer un certain nombre de canaux. Nous présentons d’abord les notions d’électromagnétisme et de
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15

Rubinsztein-Dunlop, Halina, Andrew Forbes, M. V. Berry, et al. "Roadmap on structured light (Parts 4 and 5)." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/622525.

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16

Montgomery, Patrick D. "MAGNETO-OPTICAL PROPERTIES OF THIN PERMALLOY FILMS: A STUDY OF THE MAGNETO-OPTICAL GENERATION OF LIGHT CARRYING ANGULAR MOMENTUM." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/126.

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Magneto-optical materials such as permalloy can be used to create artificial spin- ice (ASI) lattices with antiferromagnetic ordering. Magneto-optical materials used to create diffraction lattices are known to exhibit magnetic scattering at the half- order Bragg peak while in the ground state. The significant drawbacks of studying the magneto-optical generation of OAM using x-rays are cost, time, and access to proper equipment. In this work, it is shown that the possibility of studying OAM and magneto-optical materials in the spectrum of visible light at or around 2 eV is viable. Using spectro
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17

STELLA, UGO. "Light manipulation in multilayered photonic structures." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842499.

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18

Bernardo, Bertúlio de Lima. "Uma visão contemporânea de alguns conceitos da teoria quântica." Universidade Federal da Paraí­ba, 2013. http://tede.biblioteca.ufpb.br:8080/handle/tede/5736.

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Made available in DSpace on 2015-05-14T12:14:08Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1944924 bytes, checksum: e08f0978e6406af124c9fe4875d2aa1e (MD5) Previous issue date: 2013-06-06<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this thesis we discuss some fundamental aspects of the quantum theory from a contemporaneous point of view, where we could develop three works. In the first we analyze theoretically an atomic double-slit interferometer. It has been shown that if the energy eigenstates of the atom are correlated with its particle and wave behav
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19

Naidoo, Darryl. "High brightness lasers." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97044.

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20

Sit, Alicia. "Quantum Communication: Through the Elements: Earth, Air, Water." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39648.

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This thesis encompasses a body of experimental work on the use of structured light in quantum cryptographic protocols. In particular, we investigate the ability to perform quantum key distribution through various quantum channels (fibre, free-space, underwater) in laboratory and realistic conditions. We first demonstrate that a special type of optical fibre (vortex fibre) capable of coherently transmitting vector vortex modes is a viable quantum channel. Next, we describe the first demonstration of high-dimensional quantum cryptography using structured photons in an urban setting. In particula
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21

Hakobyan, Vagharshak. "Mise en forme de la lumière par interaction spin-orbite optique." Electronic Thesis or Diss., Bordeaux, 2024. https://theses.hal.science/tel-04828796.

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L'interaction spin-orbite pour la lumière permet le couplage entre les degrés de liberté associés à l'état de polarisation de la lumière et ceux associés à l'espace. Ce couplage est particulièrement important dans les milieux qui sont à la fois inhomogènes et anisotropes. Dans ce travail, nous exploitons la mise en forme des propriétés de biréfringence artificielle ou naturelles de matériaux optiques tels que la silice, le nitrure de silicium, le silicium ou les cristaux liquides pour façonner différentes propriétés d'un faisceau lumineux. En particulier, nous démontrons la réalisation d'éléme
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22

Lefier, Yannick. "Etudes du couplage spin-orbite en nano-photonique. applications à l'excitation unidirectionnelle de modes plasmoniques guidés et à la génération d'opto-aimants nanométriques contrôlables par l'état de polarisation de la lumière." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2065/document.

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Cette thèse porte sur la manipulation du moment angulaire de la lumière à l'échelle sub-micronique. Le moment angulaire total de la lumière est composé d'une partie de spin, relié au degré de liberté de polarisation circulaire de la lumière, et d'une partie orbitale, relié au degré de libertés spatiaux de la lumière que sont sa direction de propagation (locale et globale) et sa distribution spatiale d'intensité. Le couplage spin-orbite existant entre ces deux contributions permet alors de manipuler les degrés de libertés spatiaux de la lumière par un simple contrôle de son état de polarisation
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23

AMARAL, Anderson Monteiro. "Transverse optical phenomena with Gaussian beams and optical vortices." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18646.

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Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2017-04-26T16:56:47Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_Anderson_Amaral.pdf: 6016426 bytes, checksum: d9633b708d004572ce2495387f757089 (MD5)<br>Made available in DSpace on 2017-04-26T16:56:47Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_Anderson_Amaral.pdf: 6016426 bytes, checksum: d9633b708d004572ce2495387f757089 (MD5) Previous issue date: 2016-02-29<br>CNPQ<br>In this thesis are presented various result
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24

Narváez, Castañeda Emmanuel. "Elliptical Vortex Beams Through Turbulent Atmosphere." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1608232137775185.

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25

Hakobyan, Davit. "Spin-orbit optomechanics of space-variant birefringent media." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0081/document.

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Ce travail consiste en l'étude de phénomènes optomécaniques en d'interaction spin-orbite de la lumière, en utilisant des milieux inhomogènes et anisotropes comme systèmes modèles, différents types de systèmes matériels étant considérés en pratique. En particulier,nous avons utilisé des défauts de cristaux liquides nématiques pour lesquels nous avons identifié expérimentalement d'un couple optique de nature spin-orbite conduisant à des modifications de champ d'orientation moléculaire du cristal liquide. Aussi, grâce à l'utilisation de verres nanostructurés artificiellement permettant un contrôl
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26

Boulier, Thomas. "Controlled vortex lattices and non-classical light with microcavity polaritons." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066524.

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Les polaritons sont des quasi-particules bosoniques venant du couplage fort entre des photons de cavité et des excitons confinés dans une hétérostructure semiconductrice. De par leur temps de vie très court et leur très fortes interactions, les polaritons sont un système idéal pour étudier des problèmes fondamentaux d’hydrodynamique quantique hors équilibre ainsi que des aspects plus appliqués d’optique quantique, comme l’implémentation de transistors opto-electroniques ultra-rapides ou la génération d’états non-classiques de la lumière.Ces deux thèmes sont traités dans cette thèse. Dans la pr
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27

Li, Shilong. "Probing and modeling of optical resonances in rolled-up structures." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159996.

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Optical microcavities (OMs) are receiving increasing attention owing to their potential applications ranging from cavity quantum electrodynamics, optical detection to photonic devices. Recently, rolled-up structures have been demonstrated as OMs which have gained considerable attention owing to their excellent customizability. To fully exploit this customizability, asymmetric and topological rolled-up OMs are proposed and investigated in addition to conventional rolled-up OMs in this thesis. By doing so, novel phenomena and applications are demonstrated in OMs. The fabrication of conventional
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28

Henry, Kevin Claude. "Soft Surface Roll Mechanics Parameters for Light Vehicle Rollover Accident Reconstruction." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1436.

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Light vehicle rollover accidents on soft surfaces can be modeled assuming constant drag with linear motion equations and other engineering principles. The concept of using segment average results to evaluate roll mechanics parameters throughout a roll sequence, and specifically, segment duration to evaluate vehicle trajectory between ground impacts is developed. The trajectory model is presented, explained and compared to values obtained by analyzing digital video of rollover crash tests. Detailed film analysis procedures are developed to obtain data from rollover crash tests that are not othe
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29

Dudley, Angela. "Superpositions of light fields carrying orbital angular momentum." Thesis, 2012. http://hdl.handle.net/10413/10153.

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The work presented in this thesis is centred on the generation of superimposed optical fields which each carry orbital angular momentum (OAM) and the development of OAM measurement techniques. Optical fields which carry OAM have found applications ranging from optical tweezing to quantum cryptography. Due to the fact that they offer a potentially infinite-dimensional state space, much interest has been generated in the measurement of OAM in optical fields, in order for higher-dimensional quantum information processing to be realised. In this study we generate superpositions of higher-order Bes
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30

BRACCINI, MATTEO. "Optical control of the orbital angular momentum of light: techniques and devices." Doctoral thesis, 2012. http://hdl.handle.net/11573/917728.

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A theoretical and experimental study of optical vortices and phase singularities has been performed, focusing on generation and control techniques. New devices capable of generating optical vortices have been proposed and manipulation and tuning of the orbital angular momentum of a light beam via linear and nolinear optical processes has been studied and experimentally demonstrated.
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31

Bahl, Monika. "Segregation of orbital angular momentum states of light by helmholtz hodge decompostion." Thesis, 2016. http://localhost:8080/iit/handle/2074/7134.

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32

Cardano, Filippo. "Engineering spin and orbital angular momentum interactions in a light beam: quantum and classical applications." Tesi di dottorato, 2015. http://www.fedoa.unina.it/10238/1/Cardano_Tesi_di_Dottorato.pdf.

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The angular momentum of light is a useful resource for many applications. In specific physical architectures it can be considered as the sum of two independent terms, the spin and the orbital components, in analogy to particle systems. The spin angular momentum is related to the polarization of the optical beam, that is the direction of the oscillating electric field, whereas the orbital angular momentum is associated with the spatial distribution of the field. Being independent, spin and orbital angular momenta have been discovered and explored in separate contexts for many years, while only
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33

Chia-HuiShen and 沈佳輝. "Generation of light beams with orbital angular momentum by electron cyclotron motion excited surface plasmon emission." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/98xf4z.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>107<br>When the electron beam passes through the grating structure, the surface plasma is radiated, and changing the period of the grating changes the radiation angle. Using this mechanism, we designed periodic gratings to be arranged along a circle, with an electron beam with electron cyclotron motion passing under the structure to radiate an orbital angular momentum beam. By fixing the electron beam energy to change the number of gratings and the number of fixed gratings to change the energy of the electron beam, orbital angular momentum beams with different topo
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34

Yan, Lu. "Stimulated emission depletion microscopy with optical fibers." Thesis, 2017. https://hdl.handle.net/2144/20853.

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Imaging at the nanoscale and/or at remote locations holds great promise for studies in fields as disparate as the life sciences and materials sciences. One such microscopy technique, stimulated emission depletion (STED) microscopy, is one of several fluorescence based imaging techniques that offers resolution beyond the diffraction-limit. All current implementations of STED microscopy, however, involve the use of free-space beam shaping devices to achieve the Gaussian- and donut-shaped Orbital Angular Momentum (OAM) carrying beams at the desired colors –-- a challenging prospect from the stand
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35

Li, Shilong. "Probing and modeling of optical resonances in rolled-up structures." Doctoral thesis, 2014. https://monarch.qucosa.de/id/qucosa%3A20190.

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Optical microcavities (OMs) are receiving increasing attention owing to their potential applications ranging from cavity quantum electrodynamics, optical detection to photonic devices. Recently, rolled-up structures have been demonstrated as OMs which have gained considerable attention owing to their excellent customizability. To fully exploit this customizability, asymmetric and topological rolled-up OMs are proposed and investigated in addition to conventional rolled-up OMs in this thesis. By doing so, novel phenomena and applications are demonstrated in OMs. The fabrication of conventional
APA, Harvard, Vancouver, ISO, and other styles
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