Rozprawy doktorskie na temat „Optical Properties”
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Park, Seung-Han. "Excitonic optical nonlinearities in semiconductors and semiconductor microstructures". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184551.
Pełny tekst źródłaUrban, Joanna. "Optical and vibrational properties". Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30092.
Pełny tekst źródłaAtomically thin layered materials with low symmetry which leads to in-plane anisotropy of electronic and optical properties are particularly interesting from the point of view of applications. In this thesis, the optoelectronic properties of three layered materials within-plane anisotropy, black phosphorus, rhenium disulfide and franckeite are investigated using optical spectroscopy. Black phosphorus (BP), with a puckered orthorhombic structure, has significant in-plane anisotropy and a direct bandgap which varies strongly with the number of layers. A significant hindrance from the point of view of the realization of BP-based devices is its degradation in ambient conditions, which can be prevented by encapsulation, for example using hexagonal boron nitride (h-BN). We have investigated the vibrational properties of h-BN encapsulated black phosphorus using Raman spectroscopy and report the first experimental observation of a theoretically predicted new peak slightly above the A1g mode. We explain its appearance by a difference of the mode frequencies in the inner and surface layers and discuss this effect in the context of the strong interlayer coupling in BP and the influence of the encapsulation on the lattice properties. The second part of this thesis presents the results of photoluminescence studies of few-layer rhenium disulfide. The optical response of ReS2is dominated by two energetically nondegenerate anisotropic excitons X1around 1.55 eV and X2 around 1.57 eV which can be observed in polarized absorption and emission. A controversy exists regarding the nature of the fundamental bandgap of ReS2, in particular the presence of a crossover from indirect to direct bandgap with changing thickness. We have studied the polarized emission related to the excitonic states at low temperature as a function of the number of layers and compared the experimental results with the predictions of a kinetic model describing the radiative recombination and scattering between excitonic states. We conclude that the features observed in photoluminescence arise due to hot emission from direct excitonic states and that a smaller, indirect bandgap and a related excitonic state are responsible for the depopulation of the direct states, the relatively weak emission intensity and the observed X1and X2 emission ratio. Franckeite, a complex sulfide mineral, has attracted attention as a natural type-II heterostructure composed of alternating pseudo-hexagonal and pseudo-tetragonal layers. The incommensurate character of the two lattices leads to one-dimensional rippling. The last part of this thesis describes our observation of anomalous polarization dependence of the Raman modes in exfoliated franckeite flakes, which suggested the presence of optical anisotropy and could be used as a rapid and non-invasive method to identify the rippling direction
Rochford, Kent Blair. "Linear and nonlinear optical properties of polydiacetylene waveguides". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185340.
Pełny tekst źródłaLi, Qing. "Optical properties of III-nitride semiconductors". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B30162488.
Pełny tekst źródłaGleeson, 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.
Pełny tekst źródłaAlshammary, Marzook. "Optical and magneto-optical properties of doped oxides". Thesis, University of Sheffield, 2011. http://etheses.whiterose.ac.uk/2066/.
Pełny tekst źródłaPapapanayotou, I. "Chemical properties and optical properties of carbonaceous particles". Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383288.
Pełny tekst źródłaAuguié, Baptiste. "Optical properties of gold nanostructures". Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/73955.
Pełny tekst źródłaCrook, Robert J. "Optical properties of organic waveguides". Thesis, University of Exeter, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359604.
Pełny tekst źródłaZhou, Yuming. "Optical properties of living organisms". Thesis, Open University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301878.
Pełny tekst źródłaWan, Wai Man Vivian. "Optical properties of conjugated polymers". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621328.
Pełny tekst źródłaRosenow, Judith. "Optical Properties of Condensation Trails". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-205659.
Pełny tekst źródłaLanglebige Kondensstreifen sind Eiswolken, welche durch Kondensation von Wasserdampf an Rußpartikeln in einer eisübersättigten Atmosphäre entstehen. Der Wasserdampf entstammt einerseits aus dem Triebwerkabgas und andererseits aus der Atmosphäre. Kondensstreifen können die Atmosphäre durch Rückstreuung solarer Strahlung kühlen und durch Rückstreuung und Absorption terrestrischer Strahlung erwärmen. Der Einfluss von Kondensstreifen auf den Wärmehaushalt der Atmosphäre und damit die Antwort auf die Frage nach dem dominierenden Effekt wurde bisher zumeist auf globaler Ebene ermittelt, wobei der Kondensstreifen als planparallele Schicht mit konstanten optischen Eigenschaften angenähert wurde. Individuelle Kondensstreifen und der Einfluss des Sonnenstandes wurden bisher nur mithilfe eines groben Rasters betrachtet und niemals unter Berücksichtigung der Flugleistung des Luftfahrzeuges, welches den Kondensstreifen generiert hat. Für eine Trajektorienoptimierung sind jedoch präzise Berechnungen des Strahlungseinflusses und eine gewissenhafte Berücksichtigung der Flugleistung notwendig. Nur so kann der zukünftige Luftverkehr die Haupteinflussfaktoren der Flugeigenschaften auf den Strahlungseinfluss der Kondensstreifen berücksichtigen. Aus diesem Grund wurde in dieser Arbeit ein Modell entwickelt, welches die Eigenschaften des Strahlungstransfers durch den Kondensstreifen kontinuierlich bestimmt und die aus der Flugleistung resultierenden Parameter berücksichtigt
Khan, Saima Ishfaque. "The optical properties of metamaterials". Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7781/.
Pełny tekst źródłaGonzález, Ganzábal A. (Alejandro). "Optical properties of leaf replicas". Master's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201808232657.
Pełny tekst źródłaLee, Timothy. "Nonlinear properties of optical microfibres". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/355529/.
Pełny tekst źródłaMolloy, Peter J. "Optical properties of concentrated dispersions". Thesis, London Metropolitan University, 1986. http://repository.londonmet.ac.uk/2939/.
Pełny tekst źródłaWang, Jun, i 王俊. "Optical properties of graphene/GaN hybrid structure". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206660.
Pełny tekst źródłapublished_or_final_version
Physics
Master
Master of Philosophy
LEE, YONG HEE. "ROOM-TEMPERATURE OPTICAL NONLINEARITIES IN GALLIUM-ARSENIDE AND FAST OPTICAL LOGIC GATES". Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183920.
Pełny tekst źródłaMohamed, Mona Bakr. "Metallic and semiconductor nanoparticles : synthesis, characterization and femtosecond laser spectroscopic studies". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/31057.
Pełny tekst źródłaHill, Isiah Jasper Jr. "Synthesis of azodyes and polyurethanes for use as nonlinear optical materials". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/28930.
Pełny tekst źródłaLowry, Curtis Wayne. "Optical nonlinearities in passive and active gallium arsenide with applications to optical switching and laser instabilities". Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186295.
Pełny tekst źródłaBalasubramanian, Kunjithapatham. "Structural inhomogeneity and anisotropy in optical filters and thin films; applications to optical storage media". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184564.
Pełny tekst źródłaZongo, Sidiki. "Nonlinear optical properties of natural dyes based on optical resonance". Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/4635.
Pełny tekst źródłaRecent research shows that the study of optical properties of organic material natural dyes has gained much consideration. The specific functional groups in several natural dyes remain essential for the large nonlinear absorption expressed in terms of nonlinear optical susceptibilities or other mechanism of absorption such as two photon absorption (TPA), reverse saturable absorption (RSA) or intensitydependent refractive index characteristic. In this thesis we highlight the optical limiting responses of selected natural dyes as nonlinear response in the femtosecond regime. This technique refers to the decrease of the transmittance of the material with the increased incident light intensity.Three dyes derived from beetroot, flame flower and mimosa flower dyes were investigated. The results showed a limiting behaviour around 795 mW for the beetroot and the flame dye while there is total transmission in the flame dye sample. The performance of the nonlinearity i.e. the optical limiting is related to the existence of alternating single and double bonds (i.e. C-C and C=C bonds) in the molecules that provides the material with the electron delocalization, but also it is related to the light intensity.Beside nonlinearity study, crystallographic investigation was carried out for more possible applicability of the selected dyes and this concerned only the mimosa and flame flower dye thin film samples since the beetroot thin film was very sensitive to strong irradiation (i.e. immediately destroyed when exposed to light with high intensity). For more stability,dye solutions were encapsulated in gels for further measurements.
Faber, Dirk Johannes. "Functional optical coherence tomography spatially resolved measurements of optical properties /". [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2005. http://dare.uva.nl/document/88794.
Pełny tekst źródłaNeethling, Pieter. "Determining non-linear optical properties using the Z-scan technique". Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1135.
Pełny tekst źródłaZheng, Changcheng, i 郑昌成. "Nonlinear optical properties of zinc oxide". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47147751.
Pełny tekst źródłaCha, Cheol Yong. "Structure-property study of kapton PMDA-ODA polyimide films". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/9332.
Pełny tekst źródłaCraig, Duncan Wilson. "Optical nonlinearities in CdHgTe". Thesis, Heriot-Watt University, 1987. http://hdl.handle.net/10399/1015.
Pełny tekst źródłaAnderson, Richard M. "Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/30027.
Pełny tekst źródłaPark, Wounjhang. "Optical properties of thin film phosphors". Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/30078.
Pełny tekst źródłaHartschuh, Ryan D. "Optical Spectroscopy of Nanostructured Materials". University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1195016254.
Pełny tekst źródłaThielen, Peter. "Nonlinear optical properties of chalcogenide glasses /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Pełny tekst źródłaRybka, Marcin. "Optical properties of MAX-phase materials". Thesis, Linköping University, Applied Optics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60008.
Pełny tekst źródła
MAX-phase materials are a new type of material class. These materials are potentiallyt echnologically important as they show unique physical properties due to the combination of metals and ceramics. In this project, spectroscopic ellipsometry in the spectral range of 0.06 eV –6.0 eV was used to probe the linear optical response of MAX-phases in terms of the complexd dielectric function ε(ω) = ε1(ω) + iε2(ω). Measured data were fit to theoretical models using the Lorentz and generalized oscillator models. Data from seven different samples of MAX-phase materials were obtained using two ellipsometers. Each sample dielectric function was determined, including their infrared spectrum.
Neff, Curtis Wayne. "Optical Properties of Superlattice Photonic Crystals". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/14108.
Pełny tekst źródłaYildirim, Hasan. "Nonlinear Optical Properties Of Semiconductor Heterostructures". Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607438/index.pdf.
Pełny tekst źródłaschl-Teller type potential which has been rarely considered in this area. It has a tunable asymmetry parameter, making it a good candidate to investigate the effect of the asymmetry on the nonlinear optical properties. The calculated nonlinear quantities include nonlinear absorption coefficient, second-harmonic generation, optical rectification, third-harmonic generation and the intensity-dependent refractive index. The effects of the DC electric field on the corresponding nonlinearities are also studied. The results are in good agreement with the results obtained in other types of quantum wells, such as square and parabolic quantum wells. The effects of the Coulomb interaction among the electrons on the nonlinear intersubband absorption are considered within the rotating wave approximation. The result is applied to a Si-delta-doped, square quantum well in which the Coulomb interaction among the electrons are relatively important, since there has been no work on the nonlinear absorption spectrum of the Si-delta-doped quantum well. The results are found to be new and interesting, especially when a DC electric field is included in the calculations.
Fischer, Peer. "Nonlinear optical properties of chiral media". Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/265442.
Pełny tekst źródłaAl, Shakhs Mohammed Hashim. "Engineering optical properties using layered metamaterials". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62525.
Pełny tekst źródłaApplied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
Shi, Shenlei. "Exciton related optical properties of ZnO". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38284881.
Pełny tekst źródłaQuraishi, Qudsia. "Optical frequency combs: Properties and applications". Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284408.
Pełny tekst źródłaBentley, Caroline. "Optical and microwave properties of ferrofluids". Thesis, Bangor University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290411.
Pełny tekst źródłaShi, Shenlei, i 施申蕾. "Exciton related optical properties of ZnO". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38284881.
Pełny tekst źródłaApostol, Adela. "COHERENCE PROPERTIES OF OPTICAL NEAR-FIELDS". Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2715.
Pełny tekst źródłaPh.D.
Other
Optics and Photonics
Optics
Adderley, B. M. "Nonlinear optical properties of semiconductor superlattices". Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239137.
Pełny tekst źródłaWestland, S. "The optical properties of printing inks". Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383339.
Pełny tekst źródłaEvans, H. I. "The optical properties of oxide bronzes". Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47054.
Pełny tekst źródłaBłaszczak, Zuzanna. "Optical properties of the vertebrate retina". Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708798.
Pełny tekst źródłaBlack, Marcie R. (Marcie Rochelle). "The optical properties of bismuth nanowires". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17594.
Pełny tekst źródłaIncludes bibliographical references (p. 170-177).
The optical absorption of bismuth nanowires in the energy (wavenumber) range of 600 - 4000cm-1 is studied. Optical reflection and transmission spectra reveal that bismuth nanowires have a large and intense absorption peak as well as several smaller absorption peaks which are not measured in bulk bismuth. The smaller absorption peaks fit reasonably well to theoretical models for intersubband absorption in bismuth nanowires. The wire diameter, polarization, and doping dependencies as well as the spectral shape of the dominant peak agree with simulations of the optical absorption resulting from an L-point valence to T-point valence band electronic transition. The large absorption peak is present even for nanowires too large to exhibit quantum confinement, thus showing that the absorption results from a surface-induced effect and not from quantum confinement. The enhanced optical absorption in nanowires over bulk bismuth is attributed to a surface term in the matrix element which results from the spacial gradient of the dielectric function and the large dielectric mismatch between bismuth and the surrounding alumina or air. A comparison of the measured spectra with simulations of optical absorption resulting from direct L-point electronic transitions demonstrated that this absorption mechanism is not dominant in our materials. In order to explore the optical properties of bismuth nanowires, two methods were developed. First, effective medium theory applied in reverse was used to deduce the dielectric function of materials smaller than the wavelength of light. Second, a technique to fabricate nanowires with diameters above 200nm was transfered into our laboratory.
(cont.) The enhanced coupling between the L-T point valence bands in nanowires may lead to a very accurate measurement of the band gap and band overlap in bismuth as a function of doping and temperature. In addition, the discovery of the enhanced interband coupling resulting from the surface contribution to the matrix element has many implications, especially if this result is applicable to other systems.
by Marcie R. Black.
Ph.D.
Zuehlsdorff, Tim Joachim. "Computing optical properties of large systems". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/29208.
Pełny tekst źródłaDjalalian, 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.
Pełny tekst źródłaKuhta, Nicholas Anthony. "The optical properties of multi-scale plasmonic structures and their applications in optical characterization and imaging". Thesis, 2012. http://hdl.handle.net/1957/31106.
Pełny tekst źródłaGraduation date: 2013