Now showing items 1-10 of 629
Relationship between the optical gap and the optical-absorption tail breadth in amorphous GaAs
(American Institute of Physics (AIP), 2004-12-15)
We study the relationship between the optical gap and the optical-absorption tail breadth for the case of amorphous gallium arsenide (a-GaAs). In particular, we analyze the optical-absorption spectra corresponding to some ...
Microscopic theory of photonic band gaps in optical lattices
(Elsevier BVAmsterdam, 2014-02)
We propose a microscopic model to describe the scattering of light by atoms in optical lattices. The model is shown to efficiently capture Bragg scattering, spontaneous emission and photonic band gaps. A connection to the ...
Microstructure, dielectric properties and optical band gap control on the photoluminescence behavior of Ba[Zr0.25Ti0.75]O-3 thin films
Ba[Zr0.25Ti0.75]O-3 (BZT) thin films were synthesized by the complex polymerization method and heat treated at 400 A degrees C for different times and at 700 A degrees C for 2 h. These thin films were analyzed by X-ray ...
Gap solitons in a dipolar Bose-Einstein condensate on a three-dimensional optical lattice
(Iop Publishing Ltd, 2011-06-28)
We suggest and study the stable disc- and cigar-shaped gap solitons of a dipolar Bose-Einstein condensate of (52)Cr atoms localized in the lowest band gap by three optical-lattice (OL) potentials along orthogonal directions. ...
Spectroscopic studies of SnO2 doped with Cr, Co or Nb
SnO2 ceramics doped with different amounts of Co, Cr or Nb were investigated using visible and infrared spectroscopy at room temperature. Based on the observed d-d transitions the valence states of incorporated dopants ...
HMDSO plasma polymerization and thin film optical properties
Thin films were deposited from hexamethyldisiloxane (HMDSO) in a glow discharge supplied with radiofrequency (rf) power. Actino-metric optical emission spectroscopy was used to follow trends in the plasma concentrations ...
Light induced permanent modifications of the nonlinear optical properties of semiconductor doped glasses
(Pergamon-elsevier Science LtdOxfordInglaterra, 1996)
Optical and structural properties of PEO-like plasma polymers
(Taylor & Francis Ltd, 2002-01-01)
This paper deals with the study of optical, structural and biocompatible properties of PEO-like plasma polymerized films resulting from RF excited diethylene glycol dimethyl ether (CH3O(CH2CH2O)(2)CH3 diglyme) glow discharges. ...
Gap solitons in fermion superfluids
(Elsevier B.V., 2009-12-01)
We consider a dynamical model of a superfluid Fermi gas in the Bardeen-Cooper-Schrieffer regime trapped in a periodic optical lattice (OL) potential. The model is based on an equation for complex order parameter phi of the ...
Zero-phi(eff) Non-bragg Gap Solitons In 1d Kerr Polaritonic/metamaterial Heterostructures
(Elsevier Science BVAmsterdam, 2016)