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Infrared and ellipsometric studies of reactive-ion-beam-sputtered hydrogenated amorphous silicon (a-Si:H), germanium (a-Ge:H) and Si---Ge alloy (a-Si28Ge72:H) films—a correlation
(1991)Infrared and spectroscopic ellipsometric studies have been done on thin films of hydrogenated amorphous silicon (a-Si:H), germanium (a-Ge:H) and silicon---germanium alloy of a typical composition (a-Si28Ge72:H) prepared ... -
Etching of crystalline and amorphous silicon in CClF3 plasma
(1991)Plasma etching of crystalline and hydrogenated amorphous silicon has been studied in CClF3 gas as a function of pressure and power using a 30 kHz parallel plate plasma-etching system. In contrast to CF4 plasma, etching of ... -
Effect of addition of lead on the superconductivity and structure of Bi2Sr2Ca2Cu3O10 ceramics
(1991)Optimum sintering treatment of and the amount of lead needed in Bi2Sr2Ca2Cu3O10 to obtain the best superconducting properties are reported. On the basis of X-ray diffraction studies it has been established that the presence ... -
The effect of oxygen impurity on growth of molybdenum disilicide and its distribution during rapid thermal annealing of co-sputtered MoSix thin films
(1992)Thin films of MoSix (with and without oxygen) were deposited by co-sputtering of molybdenum and silicon targets. As-deposited films were annealed in argon environment in the temperature range 700–1150 °C for 15–120 s. Rapid ... -
Comparative study of crystallization processes in Sb2Te3 films using laser and thermal annealing techniques
(1992)Adherent and pin-hole free amorphous Sb2Te3 thin films have been obtained by vacuum evaporation at substrate temperatures ≤25 °C. The films have been crystallized by thermal and laser annealing, and the crystallization ... -
Analysis of metal clad uniaxial waveguides
(1991)In this paper, a study of metal clad anisotropic waveguides is presented and applied to surface plasmon modes at a metal-uniaxial interface and a thick and a thin metal clad uniaxial waveguide. The effect of anisotropy on ... -
Stability improvement in bleached phase holograms
(1991)An experimental study has been made of the influence of developer composition on the stability against the print-out effect of bleached, photographically recorded two-beam interference grating on Agfa-Gevaert 10E75 NAH ... -
Co-propagation of pulses with steepening and phase modulation effects
(1991)We consider the copragation of a high intensity pump and a low intensity signal in the presence of dispersion, phase modulation and steepening effects. The possibility of obtaining large compression for the signal pulse ... -
Crystal orientation dependence of the SNR for signal beam amplification in photorefractive BaTiO3
(1991)In signal beam amplification by two-beam coupling in BaTiO3 photorefractive crystals, beam fanning in the direction of the amplified signal reduces the signal-to-noise ratio (SNR). The dependence of the SNR and the signal ... -
The preparation, properties and applications of silicon nitride thin films deposited by plasma-enhanced chemical vapor deposition
(1991)The purpose of this paper is to review the preparation and characterization of thin films of silicon nitride deposited by the technique of plasma-enhanced chemical vapor deposition. The applications of silicon nitride thin ... -
Electrical and optical properties of ion-beam- sputtered amorphous silicon-germanium alloy films
(1991)Amorphous silicon-germanium (a-Si1â xGex) thin films have been prepared co-sputtering a composite target of high purity crystalline silicon (c-Si) and c-Ge using ion beam sputtering technique. The desired composition has ... -
Nonlinear pulse propagation in a monomode composite glass optical fibre
(1991)Starting from the nonlinear wave equation the basic dynamical equation for pulse propagation in a monomode composite glass optical fibre with saturating nonlinearity is derived. The qualitative analysis based on the integrals ... -
Surface analysis of a black copper selective coating
(1991)This paper presents the surface analysis of a black copper selective coating using AES and XPS techniques. This study indicates that the textured black copper selective coating is a multiphase system. These surfaces are ... -
Spatial amplification via photorefractive two-beam coupling; real-time image processing using controllable erasure of Fourier spectrum
(1991)A real-time image processing technique has been described, using a two-beam coupling geometry in photorefractive materials. An erase beam copropagating with the signal beam allows spatial amplification of selected frequency ... -
Higher order self-diffraction in absorptive photorefractive medium; transmission geometry
(1992)Interactions between optical beams incident upon and two self-diffracted beams generated within an absorptive photorefractive material are investigated by solving a set of coupled differential equations. The medium is ... -
Anisotropic conical scattering in photorefractive BaTiO3: diffraction efficiency measurements
(1991)The simultaneous presence of beam fanning and anisotropic conical scattering hinders the exact measurements on anisotropic conical diffraction. In this paper, a method is described for the measurement of diffraction ... -
Interaction of Mo/Ni and Mo/Co bilayer structures with silicon
(1991)The thin film interaction of Mo/Ni and Mo/Co bilayer structures was investigated in the temperature range 500–650 °C by Auger electron spectroscopy and glancing angle X-ray diffraction. It was observed that (i) the silicide ... -
Phonons in high Tc superconductor Nd2−xCexCuO4
(1991)The phonon dispersion relation of high Tc electron superconductor Nd2−xCexCuO4 have been investigated using a modified rigid ion model keeping in view the limitations of the earlier models applied to calculate the phonons ... -
Effect of humid atmosphere on the stability of superconducting phases of BSCCO system
(1991)A systematic study of the effect of humid atmosphere on the stability of various phases of BSCCO system is reported. Samples exhibiting single 2223 phase were found to be insensitive to humid atmosphere, whereas multiphasic ... -
Wavelength division multiplexing of phase modulated solitons
(1992)The simultaneous propagation of N phase modulated bright solitons at N different wavelengths in a single mode optical fiber is considered. The conditions necessary for such wavelength multiplexed operation in a lossless ... -
New spectrum analysis technique for interferometric vibration measurement
(1992)A new spectrum analysis technique for linear, direct measurement of dynamic phase shift in an unstabilised, no-phase bias optical homodyne interferometer is described. A minimum detectable phase shift of 0.01 rad is ... -
Analytic solution to the BCS equation for the superconducting transition temperature
(1992)An analytic solution to the BCS equation for the superconducting transition temperature has been obtained. Instead of the electron- phonon interaction being assumed to be a constant in a certain range as was done in BCS ... -
Normal coordinate analyses and lattice dynamical calculations of spinel-type 6Li2ZnCl4 and 6.94Li2ZnCl4
(1994)Lattice dynamical calculations of spinel-type 6Li2ZnCl4 and 6.94Li2ZnCl4 (natural abundance of Li) have been performed using various potential models (short range, rigid ion, valence force Ki,Fi, Hi, ki, central and angular ... -
Effect of angular forces on the phonons in defect chalcopyrite CdGa2S4
(1994)The phonons in defect chalcopyrite CdGa2S4 are investigated without and with deLauney-type angular forces. It has been observed that angular forces play a very important role in determining the phonons in defect chalcopyrite ... -
Experimental investigation of source correlations in the time domain
(1994)An experimental study of source correlation effects in the time domain providing experimental evidence for splitting of the spectral line is reported. Evidence of the splitting is also provided from the available data on ... -
Structural, optical and magnetic properties of Cd0.77Mn0.23Te thin films
(1994)Cd0.77Mn0.23Te thin films deposited by vacuum evaporation on various substrates have been studied for their structural, optical and magnetic properties. Whereas both the cubic and hexagonal phases coexist at low film ... -
Raman scattering line shapes as a probe of the order parameter symmetry in high — Tc superconductors
(1994)We present a microscopic many-body multichannel theory of interference effects between Raman scattering from phonon (discrete) and gap (continuum) pair electronic excitations in a superconductor with dy2−y2 pairing symmetry. ... -
Kosterlitz-Thouless transition and fluctuation effects in YBa2Cu3O7−x thin films
(1994)Fluctuation effects and temperature dependance of IV characteristics of c-axis oriented YBCO thin films on STO(100) have been investigated within the context of unbinding of vortex-antivortex pairs in the Kosterlitz-Thouless ... -
Electron-phonon interaction, superconducting transition temperature and energy gap of alkali intercalated fullerenes
(1994)The superconducting transition temperature and the superconducting energy gap of alkali intercalated fullerenes have been investigated by considering the Eliashberg equations based on the strong coupling theory of ... -
Simultaneous detection of light elements by ERDA with gas-ionisation/Si ΔE-E detector telescope
(1994)Elastic Recoil Detection Analysis (ERDA) using ΔE-E telescope with gaseous ΔE detector is carried out for the first time for simultaneous detection of H alongwith other light elements C, N, and O in Diamondlike Carbon (DLC) ...
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