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.
Results
Showing 1 to 20 of 47 for “"optical spectra"”.
-
Electric Field Effects on Optical-Spectra
Made available in DSpace on 2014-12-10T23:01:32Z (GMT). No. of bitstreams: 1 7317333.pdf: 2993149 bytes, checksum: 22ed65d038b073568c95f0f32cc6e6c6 (MD5) Previous issue date: 1972
-
Analysis of far-infrared optical spectra of multiferroics
The optical spectra of multiferroic crystals Dy_3Fe_5O_{12}, Tb_3Fe_5O_{12}, and four hexagonal RMnO_3 (5D= Er, Tm, Yb, Lu) are studied using intense bright synchrotonic light in the infrared spectral range. In regards to the materials analyzed, two rare earth iron garnets and four rare earth …
-
Modelling of semiconductor nanostructures : electronic properties and simulated optical spectra
… and quantum dots) are not unusual. Often, the optical and electronic characteristics of these structures are altered significantly as compared to bulk material. As a prerequisite to design for different applications, the study of their electronic and optical properties is essential. With the …
-
Effective tuning of bimetallic composition of gold-copper nanomolecules and the emergence of plasmon-like feature in optical spectra
… applications in the field of catalysis and optical sensors.
-
Many-body effects in metals, modulation doped quantum wells and doped semiconductors
… and peaks of many-body origin observed in the optical spectra is presented. We first establish the analogy between a system of one hole interacting with many electrons and the polaron, where one electron interacts with many phonons. We approach both cases as an eigenvalue problem for the time …
-
Analysis of Mueller matrices of metamaterials and multiferroics
The optical spectra of complex materials such as magnetic-dielectric media, magnetoelectric and multiferroic crystals, materials with intrinsic chirality, and metamaterials are studied. These media are important both for: (i) their interesting optical effects, such as Negative Index of Refraction …
-
Mueller matrix spectroscopic ellipsometry of multiferroics
… coupling reveals itself in the far-IR spectra of multiferroics. The expected optical behavior puts multiferroics into a more general category of bi-anisotropic materials, the properties of which could be only described using anisotropic dielectric [epsilon]([omega]), magnetic …
-
TDDFT calculations for excitation spectra of solids and superstructures utilizing mGGA
… we apply TDDFT plus mGGA to calculate optical spectra for bulk solids. The result shows good agreement with experimental data. III-V ternary alloys AxB1−xC are promising materials for optoelectronic, high-speed electronic and microwave applications, such as infrared emitting diodes and …
-
Spatially-resolved reflectance spectroscopy with variable fiber geometry
Optical techniques based on spectroscopic analysis have the potential for in vivo detection of early malignancies in tissue. Many optical modalities, including reflectance spectroscopy, use fiber optics as the means of light delivery and detection. However, the influence of fiber geometry on …
-
Electronic excitations in branched conjugated oligomers: A quasiparticle view and tight-binding models
… has been extended for efficient calculation of optical spectra of large branched conjugated oligomers. The methodology of tight-binding (lattice) model, originally developed in condensed matter theory, has been extended to the building block structure of conjugated molecules for explicit …
-
Semiconductor Laser Device-Level Characteristics
… lasers are highly desirable in cost-effective optical communication systems. Developing the experimental setups to extract the characteristics of the semiconductor lasers is vital to the future of the optical research projects. In this thesis, integrated experimental setup designs have been …
-
Mechanical, electronic and optical properties of multi-ternary semiconductor alloys
… investigates the mechanical, electronic and optical properties of multi-ternary, i.e., binary, ternary and quaternary, semiconductor alloys using analytical methods and first-principles calculations. For the calculations of mechanical properties, existing models on the average shear modulus …
-
Studies of the chlorinating intermediate of horseradish peroxidase
… enzymatic halogenating intermediate known. The optical spectrum of Compound X is virtually identical to the optical spectrum of Compound II. Titration of Compound X by a single electron donor, potassium ferrocyanide reduces the Compound II type spectrum to a native type spectrum. Incubation of …
-
Testing stellar models with observations from AGB and post-AGB stars
… excess and secondly by obtaining low resolution optical spectra. The optical spectra and broadband photometry from the optical to mid-infrared were used to derive luminosities, effective temperatures and masses for the post-AGB stars. These catalogs of spectroscopically verified post-AGB stars …
-
Testing stellar models with observations from AGB and post-AGB stars
… excess and secondly by obtaining low resolution optical spectra. The optical spectra and broadband photometry from the optical to mid-infrared were used to derive luminosities, effective temperatures and masses for the post-AGB stars. These catalogs of spectroscopically verified post-AGB stars …
-
Excitons in the thallous halides
… has been developed and has facilitated the optical and magneto-optical experiments on the Thallous Halides. The strain reduction achieved has revealed optical spectra of exceptional sharpness, Previously undiscovered absorption features have appeared and exciton effects have been …
-
Atomic processes in nova shells
The unusual spectra of the spatially-resolved nova shells of DQ Her, T Aur and CP Pup are reviewed. Because calculations for these conditions have not been made, recombination models of HI, HeI and CNO from a neutral to a doubly ionized state were constructed. The models are described and the …
-
Optical and transport studies of atomic hydrogen and chalcogen impurities in alkali metals
… alkali metal thin films have been studied. Their optical properties were determined by transmission measurements in the vacuum ultraviolet and transport properties were probed by means of electrical resistance. The observed optical absorption and small residual resistivities of Hand 0 indicate …
-
Joint Density-Functional Theory For Energetics And Spectroscopy In Complex Aqueous And Nonaqueous Solvents
… new methods for calculating electron excitation spectra in such systems. These theories are then applied to a range of physical problems, from dendrite formation in lithium-metal batteries to the optical spectra of solvated ions.
-
Fabrication and Characterization of Three Dimensional Photonic Crystals Generated by Multibeam Interference Lithography
… templates. In this research, optimization of the optical setup and the photoresist initiation system leads to a significant improvement of the optical quality of the crystal, as characterized by normal incidence optical spectroscopy. Theoretical spectra are calculated and demonstrate close …
Page 1 of 3