Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1283 for “"optical properties"”.
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Optical Properties of Novel Materials
Optical Spectroscopy is a well-established experimental technique for the study of solids, gasses, and liquids. This thesis focuses on two broad topics related to optical spectroscopy; experimental instrumentation, and its application to novel materials. The first half of the thesis discusses the …
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MAX-phase Partial Optical Properties
The optical and electrical properties of MAX-phase materials have been thoroughly studied in the past. We present here a new technique to determine and study the partial contributions to the optical properties. Following the same methodology as the decomposition of the density of states to the …
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Optical properties of SiGe nanostructures
In this thesis, Raman Scattering (RS) and photoluminescence (PL) measurements of Ge nanowires (NWs) grown via vapor-liquid-solid (VLS) using chemical vapor deposition silicon substrates consisting of (100) and (111) crystallographic orientations are reported. Ge NWs grown are ~40 nm in diameter, …
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Optical properties of concentrated dispersions
… The insight Into particle behaviour given by the optical method Is superior to that given by rheology alone, which does not provide an unambiguous measure of the mode of particle alignment.
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Optical Properties of Simple Molecules
Hartree-Fock calculations have been performed both on the ground and on some highly excited states of tetrahedral molecules CH4 and SiH4, using two independent approaches. The results compare favorably both with the salient features of recent soft X-ray absorption experiments and with each other. …
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Nonlinear optical properties of nano structures
Nonlinear optical properties of nanoscale semiconductors had been a topic of intense research in recent years in attempts to realize all-optical communication systems. These semiconductor nanoclusters, in the range of 1-100nm are hosted in a dielectric material and are considered as a particular …
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Characterizing optical properties in fibrous tissues
Optical methods are promising for non-invasive tissue characterization. Biological tissues can be classified into isotropic tissues and anisotropic tissues. The optical properties of isotropic tissues such as adipose tissue are independent of measurement direction. However, optical properties of …
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Optical Properties of Gallium Arsenide-Phosphide
Made available in DSpace on 2014-12-08T22:24:02Z (GMT). No. of bitstreams: 1 6706587.pdf: 3532310 bytes, checksum: e7a893c400dfca5546c781a1ba3ef887 (MD5) Previous issue date: 1966
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Optical properties of III-V semiconductors
… was prepared and used as a multimode optical waveguide in order to measure the sub bandgap energy- and temperature-dependent refractive index of GaAs. Propagation constants for the individual modes were measured by exciting one mode at a time using a real-space diffraction grating …
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Optical properties of semiconductor quantum wires
… investigations of the subband structure and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the …
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Optical properties of semiconductor quantum wires
… investigations of the sub band structure and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the …
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Nonlinear optical properties of chiral media.
This thesis concerns nonlinear optical phenomena in liquids and at interfaces. Optical processes are considered in chiral liquids and at chiral surfaces to second order in the applied electric fields, and to third-order in fluids. Time-dependent perturbation theory is used to describe the response …
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The optical properties of bismuth nanowires
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 …
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Electronic and optical properties of InAs nanocrystals
… used to investigate the electronic and opti- cal properties of spherical InAs nanocrystals. Our calculated interband (valence-to- conduction) absorption spectra reproduce the features observed experimentally both qualitatively and quantitatively. The results relative to intraband …
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Deciphering optical properties of hollow gold nanospheres
… resonances (LSPRs) in the NIR region. Also the optical properties of these nanostructures are not yet well understood. In this thesis, the improved synthesis of hollow gold nanospheres (HGNs), which extends their localised surface plasmon resonances up to 1320 nm with citrate covered surface, is …
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Optical properties of black silicon - an analysis
… study of structural differences and analyze its optical properties by simulation and compare them with the simulated and experimental optical properties of Black Silicon and Crystalline Silicon.
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