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Dissertations / Theses on the topic 'Optical crystals'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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1

Thomas, P. A. "Optical activity in crystals." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379979.

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2

Hu, Zhen. "Modeling photonic crystal devices by Dirichlet-to-Neumann maps /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ma-b30082559f.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Mathematics in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves [85]-91)

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3

Neff, Curtis Wayne. "Optical Properties of Superlattice Photonic Crystals." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/14108.

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Photonic band gap materials, commonly referred to as photonic crystals (PCs), have been a topic of great interest for almost two decades due to their promise of unprecedented control over the propagation and generation of light. We report investigations of the optical properties of a new PC structure based upon a triangular lattice in which adjacent [i, j] rows of holes possess different properties, creating a superlattice (SL) periodicity. Symmetry arguments predicted and quot;band folding and quot; and band splitting behaviors, both of which are direct consequences of the new basis that con

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4

Burnham, Kikue Sugiyama. "Phototriggers for a liquid crystal-based optical switch." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/27900.

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5

Dzibrou, Dzmitry. "Complex Oxide Photonic Crystals." Licentiate thesis, KTH, Microelectronics and Applied Physics, MAP, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11068.

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<p>Microphotonics has been offering a body of ideas to prospective applicationsin optics. Among those, the concept of photonic integrated circuits (PIC’s) has recently spurred a substantial excitement into the scientific community. Relisation of the PIC’s becomes feasible as the size shrinkage of the optical elements is accomplished. The elements based on photonic crystals (PCs) represent promising candidacy for manufacture of PIC’s. This thesis is devoted to tailoring of optical properties and advanced modelling of two types of photonic crystals: (Bi<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>/Sm

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6

Euser, Tijmen Godfried. "Ultrafast optical switching of photonic crystals." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/57858.

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7

Lloyd, Ashley Duncan. "Optical bistability in nematic liquid crystals." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/960.

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8

Schmidt, Julian [Verfasser], and Tobias [Akademischer Betreuer] Schätz. "Optical trapping of ion Coulomb crystals." Freiburg : Universität, 2018. http://d-nb.info/1166559432/34.

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9

Djalalian, Assl Amir. "Tailoring Properties of Magneto-Optical Crystals." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199258.

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Magneto-Optic Photonic Crystals (MOPC) used in low dimension lasers whereby acting as Faraday rotators capable of 45o rotation where insertion loos is compensated by photoluminescence effect are of significant interest. In low dimension sensors MOPCs act as optical filters to selectively detect only lights at certain wavelengths. Combined with the photoluminescence effect, sensors may be designed capable of detecting signals with extremely low intensity, thus high quantum efficiency. In this work, MOPC with various Erbium dopant concentration, acting as photoluminescence centre, were modelled

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10

Hussein, Ghazanfar. "Optical signal processing using photorefractive crystals." Thesis, University of Southampton, 1992. https://eprints.soton.ac.uk/396383/.

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I describe in this thesis various techniques of optical signal processing using photorefractive BSO and BaTiO3 crystals. Operations of contrast manipulation, motion detection and parallel optical logic operations are demonstrated. Dynamic instabilities have also been investigated in photorefractive BaTiO3, in the mutually pumped geometry. Contrast manipulation of optical images has been performed via degenerate four wave mixing in BSO and BaTiO3 crystals. In BSO the technique adopted has the apparent drawback of intensity reduction, due to low reflectivities achieved, while using BaTiO3, selec

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11

Reznikov, Dmytro. "Effect of surface alignment layer on electro-optical properties of ferroelectric liquid crystal displays." [Kent, Ohio] : Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1227562895.

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Thesis (Ph.D.)--Kent State University, 2008.<br>Title from PDF t.p. (viewed Jan 5, 2010). Advisor: Philip J. Bos. Keywords: liquid crystal, smectic, display, ferroelectric. Includes bibliographical references (p. 190-194).

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12

Gleeson, H. F. "Optical and electro-optical properties of chiral mesophases." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383374.

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13

Tope, Bryan Keith. "Controlling optical beams in nematic liquid crystals." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/29634.

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A major area of research recently has been the study of nonlinear waves in liquid crystals. The availability of commercial liquid crystals and the formation of solitons at mWpower levels has meant that experimental research and the need to understand how the solitons are formed and interact has been boosted. The first part of the thesis looks at how two laser beams in a nematic liquid crystal interact. Specifically research has centred on the problem of directing a signal beam to a target area by varying the input angle of the control beam. Different approximate models are developed to describ

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14

Parish, Amanda Jane. "High Birefringence Liquid Crystals for Optical Communications." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3199.

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High birefringence ([delta]n>0.4) nematic liquid crystals are particularly attractive for infrared applications because they enable a thinner cell gap to be used for achieving fast response time and improved diffraction efficiency. In this thesis, the mesomorphic and electro-optic properties of several new fluorinated isothiocyanate (NCS) terphenyl and phenyl tolane single compounds and mixtures are reported. The single compounds demonstrated [delta]n~0.35-0.52 in the visible spectral region at room temperature and exhibit relatively low viscosity. It was found that lateral fluorine substituti

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15

Hallam, Benjamin Thomas. "Grating alignment of liquid crystals." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312444.

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16

Mutter, Lukas. "Nonlinear optical organic crystals for photonic applications." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17482.

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17

Weinberg-Wolf, Jennifer McNeil Laurie Elizabeth. "Optical characterization of organic semiconducting single crystals." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,173.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.<br>Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics & Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.

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18

Puang-ngern, Srisuda. "Nonlinear optical effects in nematic liquid crystals." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76477.

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Theoretical studies of nonlinear optical effects in nematic liquid crystals including degenerate four-wave mixing are presented. The optically induced Freedericksz transition which is essential for these effects is also described. Experimental investigations are performed using a homeotropically aligned MBBA thin film. Good agreement is obtained between the theoretical predictions and the experiments. Some potential applications of phase conjugation obtained by the backward degenerate four wave-mixing process in the field of adaptive optics and image processing are demonstrated.<br>Ph. D.

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19

Liu, Hui. "Optical Characterization of Lyotropic Chromonic Liquid Crystals." Kent State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=kent1153943609.

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20

Sathaye, Kedar. "Structuring of Liquid Crystals for Optical Technologies." Télécom Bretagne, 2012. http://www.telecom-bretagne.eu/publications/publication.php?idpublication=12147.

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L'objectif de cette thèse est de fabriquer différents dispositifs optiques basés sur la structuration des cristaux liquides. Nous avons tout d'abord présenté différentes méthodes pour aligner les molécules de cristaux liquides et détaillé celles que nous avons utilisées au cours de ce travail. L'alignement et certaines propriétés physiques des cristaux liquides ont permis de fabriquer des dispositifs optiques. Ces dispositifs se divisent généralement en trois catégories : les filtres optiques, les modulateurs spatiaux et les guides d'ondes optiques. Ils sont présents dans divers secteurs et pa

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21

Wei, Dong. "Nonlinear optical studies of chiral liquid crystals." Nice, 2012. http://www.theses.fr/2012NICE4073.

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Lorsqu’ils sont dopés avec une petite quantité de colorant du type azo-benzene, les cristaux liquides nématiques montrent des grandes linéarités optiques. Dans notre système, les colorants sont hébergés dans une structure nématique chirale, où la distribution hélicoïdale des molécules du cristal liquide inhibe la réorientation optique, tout en laissant aux colorants la possibilité de subir des changements de leur conformation moléculaire sous irradiation laser. Pendant les processus de mélange d’ondes, la photo-isomérisation des colorants, avec le changement de la forme trans à la forme cis, f

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22

Arzt, Steffi. "Measurements of optical activity and absolute optical chirality in birefringent crystals." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282424.

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23

Blair, John L. "Optical properties of the square superlattice photonic crystal structure and optical invisibility cloaking." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37112.

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The refraction properties of photonic crystal lattices offers methods to control the beam steering of light through use of non-linear dispersion contours. In this thesis new photonic crystal structures, such as the square and triangular superlattices, that provide novel refractive properties are analyzed. The property difference between rows in these structures is the hole radius Δr. The difference in hole sizes leads to observation of the superlattice effect, that is, a change in the refractive index Δn between opposite rows of holes. The index difference becomes a function of the size of

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24

Kim, Sang Hwa. "Fast Switching Polymer Stabilized Liquid Crystal Devices: Morphological and Electro-Optical Properties." [Kent, Ohio] : Kent State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1101220722.

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25

Wu, Yeheng. "Photonic Crystals with Active Organic Materials." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1269618198.

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Thesis(Ph.D.)--Case Western Reserve University, 2010<br>Title from PDF (viewed on 2010-04-12) Department of Physics Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

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26

Joshi, Vinay Joshi. "ELECTRO-OPTICAL AND FLEXOELECTRO-OPTICAL PROPERTIES ENHANCED BY BIMESOGEN-DOPED CHIRAL NEMATIC LIQUID CRYSTALS." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1543053053654711.

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27

Mirzaei, Javad. "Optical and Electro-optical Properties of Nematic Liquid Crystals with Nanoparticle Additives." The Royal Society of Chemistry, 2011. http://hdl.handle.net/1993/30280.

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Liquid crystals (LCs) are an interesting class of materials that are attracting significant attention due to their ever-growing applications in a wide variety of fields such as liquid crystal display (LCD) technology, materials science and bioscience. In recent years, along with the developments of materials at the nanoscale, doping LCs with nanoparticles (NPs) has emerged as a very promising approach for improving LC properties. Nanoparticle additives can introduce novel effects on optical and electro-optical properties of nematic liquid crystals (N-LCs), such as altered molecular alignment,

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28

Lobov, Gleb. "Electro-optical properties of one-dimensional organic crystals." Doctoral thesis, KTH, Optik och Fotonik, OFO, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220529.

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The recent development of photonics and applications puts new challenges for systems using emission, transmission and modulation of light. For these reasons, novel optical materials attract a special interest for their enabling properties for novel technologies. In this work, we performed the research on fundamental properties and the possibility of implementation of electro-optical response of Poly-3-hexylthiophene-2,5-diyl (P3HT) nanofibers, which belong to the class of organic semiconductor crystalline materials. Our research demonstrated that an external electric field allows controlling t

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29

Chen, Lu Guang, and s3064076@student rmit edu au. "Thermo-Optical Properties of Polymer Dispersed Liquid Crystals." RMIT University. Applied Science, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080206.114823.

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Polymer dispersed liquid crystal (PDLC) films, consisting of micro-sized domains of a liquid crystal dispersing in a polymer matrix, serve as the basis of a variety of high-efficiency electro-optical effects. The thermo-optical properties of the PDLCs were investigated in this thesis. The thermal properties and the morphologies of four low molar mass mesogens were studied by DSC and polarized optical microscope (POM). There were significant super cooling/heating effects on the first order phase transitions but not on the mesophase transitions. The structural effects on the transition tempera

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30

Dahlem, Marcus. "Optical studies of super-collimation in photonic crystals." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34677.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.<br>Includes bibliographical references (p. [121]-125).<br>Recent developments in material science and engineering have made possible the fabrication of photonic crystals for optical wavelengths. These periodic structures of alternating high-to-low index of refraction materials allow the observation of peculiar effects, in particular, the propagation of optical beams without spatial spreading. This effect, called super-collimation (also known as self-collimation), allows diffraction

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31

Shakya, Bijayandra. "Magneto-Optical Properties of One-Dimensional Photonic Crystals." Youngstown State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1329155177.

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32

Addis, James. "Optical properties of bent-core nematic liquid crystals." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/optical-properties-of-bentcore-nematic-liquid-crystals(de6d40c5-a11f-4ae3-ab61-dbc55671d8b4).html.

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Much of the interest in bent-core compounds in the last few years has centred aroundtheir potential to form nematic liquid crystal phases, which may be both biaxial andpolar. These properties offer possibilities for nematic ferroelectric switching andnonlinear optics applications. In this work, two optical properties, the refractive indices and the second ordernonlinear optical response, were investigated in the high temperature (> 170 °C)nematic phase of a series of bent-core oxadiazole compounds, of varying chain typeand length. An experimental technique, based on the acquisition and analysi

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33

Wang, Xinghua. "Liquid Crystal Diffractive Optical Elements: Applications and Limitations." [Kent, Ohio] : Kent State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1122499777.

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Thesis (Ph.D.)--Kent State University, 2005.<br>Title from PDF t.p. (viewed Sept. 14, 2006). Advisor: Philip J. Bos. Keywords: liquid crystal; diffractive optical element; optical phased array; spatial light modulator; high resolution wavefront control; aberration correction. Includes bibliographical references (p. 206-213).

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34

Sun, Yuh-Guin. "Nonreciprocal optical scattering of liquid crystal domains /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487335992903612.

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35

JAMESON, RALPH STEPHEN. "TEMPERATURE DEPENDENCE OF NONLINEAR REFRACTION, AND NOVEL BISTABLE OPTICAL DEVICES IN INDIUM-ANTIMONIDE." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183885.

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This dissertation presents the results of experimental research on the nonlinear refraction in InSb and the experimental demonstration of two nonlinear etalon devices using InSb as the active material. The first portion of the dissertation considers the Dynamic Burstein-Moss Shift model for nonlinearities in narrow-gap semiconductors. The physics and the equations are reviewed, and limitations in describing intensity dependent refraction in a semiconductor are considered. These limitations arise from the nonlinear dependence of charge carrier density upon irradiance. The second portion of the

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36

Debnath, Kapil. "Photonic crystal cavity based architecture for optical interconnects." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3870.

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Today's information and communication industry is confronted with a serious bottleneck due to the prohibitive energy consumption and limited transmission bandwidth of electrical interconnects. Silicon photonics offers an alternative by transferring data optically and thereby eliminating the restriction of electrical interconnects over distance and bandwidth. Due to the inherent advantage of using the same material as that used for the electronic circuitry, silicon photonics also promises high volume and low cost production plus the possibility of integration with electronics. In this thesis, I

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37

McGrath, Jonathan G. "Synthesis and Characterization of Core/Shell Hydrogel Nanoparticles and Their Application to Colloidal Crystal Optical Materials." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14537.

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This dissertation describes the use of spherical micro- and nanoparticles as building blocks for the fabrication of colloidal crystals. The polymer component used in all of the projects that are described herein is poly-N-isopropylacrylamide (pNIPAm). The polymeric identity of particles composed of this soft, hydrogel material, which is also thermoresponsive, contributes to particle self-assembly to form ordered structures. Specifically, particles that possess a core/shell topology were investigated to allow for the localization of distinct polymeric properties. Chapter 2 examines a characteri

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38

Kahl, Sören. "Bismuth iron garnet films for magneto-optical photonic crystals." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3711.

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<p>The thesis explores preparation and properties of bismuthiron garnet (BIG) films and the incorporation of BIG films intoone-dimensional magneto-optical photonic crystals (MOPCs).</p><p>Films were prepared by pulsed laser deposition. Weinvestigated or measured crystallinity, morphology,film-substrate interface, cracks, roughness, composition,magnetic coercivity, refractive index and extinctioncoefficient, and magneto-optical Faraday rotation (FR) andellipticity. The investigations were partly performed onselected samples, and partly on two series of films ondifferent substrates and of differ

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39

Broussell, Isabelle. "Optical properties of alpha-zinc aluminum sulfide:chromium single crystals." Thesis, University of Ottawa (Canada), 1998. http://hdl.handle.net/10393/4514.

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The optical properties of the chromium doped spinel type semiconductor $\alpha$-$\rm ZnAl\sb2S\sb4$ have been examined over the temperature range 2-540K. From extrinsic absorption and photoluminescence spectra the transitions between the ground state $\rm\sp4A\sb{2g}$ and the excited levels $\rm\sp2E\sb{g}\ (R\sb1$ and R$\rm\sb2),\ \sp2T\sb{2g},\ \sp4T\sb{2g}$ and $\rm\sp4T\sb{1g}$ of the Cr$\sp{3+}$ ions were observed. A fit of the measured temperature dependence of the PL decay, using a four level model, yielded the lifetimes of the $\rm\sp2E\sb{g}\ (R\sb1$ and R$\sb2)$ and $\rm\sp4T\sb{2g}$

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40

Isik, Mehmet. "Optical And Electrical Characterization Of Ga0.75in0.25se Layered Single Crystals." Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615314/index.pdf.

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In the present thesis, optical and electrical properties of Ga0.75In0.25Se layered single crystals have been studied. The optical properties of the crystals have been investigated by means of visible and infrared reflectivity and transmittance, ellipsometry, Raman spectroscopy, photoluminescence (PL) and thermoluminescence (TL) measurements. The analysis of the absorption data at room temperature revealed the existence of indirect transitions in the crystal. Moreover, the rate of change of the band gap energy with temperature was calculated from the analysis of the temperature dependence of t

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41

Mayo, Sheridan Clare. "The structure and properties of non-linear optical crystals." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306883.

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42

Jones, John Clifford. "Optical and dielectric studies of smetic C liquid crystals." Thesis, University of Hull, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359860.

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Shinton, S. E. "Optical and dielectric properties of polymer dispersed liquid crystals." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639025.

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Polymer Dispersed Liquid Crystals (PDLCs) are attracting considerable attention for new optical displays. This thesis describes the synthesis of PDLC materials, fabrication of cells and study of their optical and dielectric behaviour. This work includes two areas of research. Predominantly it is an investigation of the properties of PDLCs prepared using Polymerisation Phase Separation (PIPS) by UV irradiation of mutually soluble liquid crystal (LC) and pre-polymer materials, developed for use in PDLC systems. A limited study of liquid crystal gels completes the thesis. We demonstrate that the

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44

Steven, David Paul. "Application of nematic liquid crystals as tunable optical filters." Thesis, Edinburgh Napier University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367642.

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45

Welford, K. R. "Optical modes of layered structures containing nematic liquid crystals." Thesis, University of Exeter, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374953.

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46

Lee, Grace W. (Grace Wang). "Optical absorption of bismuth silicon oxide (Bi₁₂SiO₂₀) crystals." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/114089.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2001.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 23).<br>The purpose of this work is to characterize the optical absorption in bismuth silicon oxide (Bi₁₂SiO₂₀) crystals grown using the Bridgman technique and to identify electronic transitions responsible for absorption. Optical measurements were taken in the range of 0.4 - 11 pm at 300 K and 77 K using a spectrometer. The results show that near the band edge, there is evidence of indirect transitions

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47

Orf, Christopher B. "Synthesis and study of new optical hosts." Thesis, 1993. http://hdl.handle.net/1957/36606.

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48

Gowda, Krishne D. "X-ray, optical and electro-optical studies of some liquid crystals and crystals." Thesis, 1997. http://hdl.handle.net/2009/2643.

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49

Ke, Tsung-yu, and 柯宗佑. "Crystal Growth and Optical Properties of Mo1-xWxSe2 Layered Crystals." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/62151797202555395823.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>102<br>Molybdenum Tungsten diselenides (Mo1-xWxSe2) belong to the group VIA layer type transition metal dichalcogenides, grown by the chemical vapor transport method using Bromine (Br2) or Iodine (I2) as a transport agent. Energy dispersive X-ray spectroscopy (EDS) has been employed to determine the contents for Molybdenum Tungsten diselenides (Mo1-xWxSe2) . By analyzing the X-ray diffraction patterns, the structure of Mo1-xWxSe2 (0 x 1) remains the 2H symmetry. Raman scattering for first-order and modes have been observed in the range of 150-300 cm-1, Modified rando

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50

Yu, Jeffrey Winston. "Optical Processing Using Photorefractive Crystals." Thesis, 1988. https://thesis.library.caltech.edu/443/3/yu_jw_1988.pdf.

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<p>The ability of photorefractive crystals to holographically record an optical image in real time allows one to use them in a variety of optical information processing systems. A number of such systems are presented in this thesis. To form the ground work used in analyzing the performance of photorefractive optical processors, a comparison between the Kukhtarev and Moharam models was done. The regimes where each model sufficiently predicted the response of the photorefractive crystal was determined. In addition, a new model based on a higher perturbation expansion of Kukhtarev's material equa

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