Browsing by Author "PEROVA, TANIA"
Now showing items 21-40 of 78
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Effect of ZnS Shell Thickness on the Phonon Spectra in CdSe Quantum Dots
(The American Physical Society, 2003)The evolution of the optical phonon spectra of colloidal core/shell CdSe/ZnS quantum dots with an increase of the shell thickness from 0.5 to 3.4 monolayers has been studied by resonant Raman spectroscopy. The results ... -
Electrical Properties of High-k Ta205 Gate Dielectrics on Strained Ge-rich Layers
(IEEE, 2004)The electrical properties of ultrathin high-k Zr02 gate dielectric films dcposited on strained Gc-rich layers using microwave plasma enhanced chemical vapor deposition (PECVD) technique at a low temperature (150'C) have ... -
Electrically tunable Fabry-Pérot resonator based on microstrcutured Si containing liquid crystal
(2012)We have built Fabry-Perot resonators based on mi-crostructured silicon and a liquid crystal. The devices exhibit tuning of the resonance peaks over a wide range, with relative spectral shifts of up to ??/? = 10%. In order ... -
Electrotunable in-plane one-dimensional photonic structure based on silicon and liquid crystal
(American Institute of Physics, 2007)The model of the electro-optical effect, due to the reorientation of liquid crystal molecules from a pseudoisotropic to a homeotropic state, in a composite photonic structure with a liquid crystal filler, is elaborated. A ... -
Enhancement of photoluminescence signal from ultrathin layers with silicon nanocrystals
(2012)Using the model of oscillating dipoles, we simulated the photoluminescence intensity of a triple-layered structure where the silicon nanocrystals layer was enclosed by buffer and capping silicon dioxide layers. It was ... -
Fabrication of one-dimensional photonic crystals by photoelectrochemical etching of silicon
(2010)The conditions of formation of deep periodic trenches by photoelectrochemical etching of n-Si (100) with linear seeds on the surface are analyzed. Criteria for the proper choice of the period of seed grooves and the etching ... -
FTIR and Raman Investigation of Vertically Etched Silicon as 1-D Photonic Crystal
(SPIE, 2003)The reflection spectra of composite materials on the base of grooved silicon and grooved silicon infiltrated with nematic liquid crystal (LC) have been calculated using the optimal parameters of a grooved silicon matrix ... -
Functionalization of Single Walled Carbon Nanotubes with Optically Switchable Spiropyrans
(2010)The design, synthesis and complete characterization of a smart material composed of single-walled nanotubes functionalized with spiropyran-based photo switchable molecules are reported. The chemical complexity of the system ... -
In situ investigation of thermally influenced phase transformations in (pb0.92sr0.08) (zr0.65ti0.35)o3 thin films using micro-raman spectroscopy and x-ray diffraction
(IEEE, 2009)Thin films of ferroelectric strontium-doped lead zirconate titanate [PSZT, (Pb0.92Sr0.08)(Zr0.65Ti0.35)O3] deposited by RF magnetron sputtering have been analyzed by in situ analysis techniques. The in situ techniques ... -
Investigation into the Structure and Composition of Carbon/Carbon-SiC Composites
(2003)In this work, pyrolytical carbon and C-SixCy-SiC coatings were deposited by chemical vapour deposition (CVD) in a 'Cold Wall' reactor. The C/C samples from 'Schunk Kohlenstofftechnik GmbH', Germany were used as substrates. ... -
Investigation of correlation between characteristics of Raman spectra and parameters of data-scattering obtained from phase coherence theory
(SPIE, 2005)The importance of sensitive monitoring of changes in Raman spectra in particular for microelectronic applications is discussed here. We explore the practicality of using a data-scattering method to analyse Raman spectra, ... -
Investigation of germanium implanted with hydrogen for layer transfer applications
(2011)The technology for thin Ge layer transfer by hydrogen ion-cut process is characterised in this work. Experiments were carried out to determine suitable hydrogen ion implantation doses in germanium for the low temperature ... -
Investigation of Precision Grinding Process for Production of Silicon Diaphragms
(Society of Photo-Optical Instrumentation Engineers, 2002)The application of precision grinding for the formation of a silicon diaphragm is investigated. The test structures involved 2?6 mm diam diaphragms with thicknesses in the range of 25?150 mm. When grinding is performed ... -
Investigations on rare-earth doped alumino-silicate xerogel incorporated in micro-channel glass and porous silicon
(2005)Porous materials in general have received great attention from the last century. The development of new porous materials and the preparation of new composites based on porous materials is a subject of interest. The development ... -
Local Field Effect on Infrared Phonon Frequencies of Thin Dielectric Films
(SPIE, 2003)A number of thin dielectric films deposited onto aluminated glass substrates and onto the materials transparent in the IR range (silicon, KRS-5 and CsI) were investigated using infrared transmission and reflection-absorption ... -
Micro-Raman and spreading resistance analysis on bevelled implanted germanium for layer transfer applications
(2011)Raman and spreading resistance profiling have been used to analyze defects in germanium caused by hydrogen and helium implants, of typical fluences used in layer transfer applications. Beveling has been used to facilitate ...
