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Rumyantsev V.,Mediterranean Institute of Fundamental Physics | Rumyantsev V.,Galkin Institute for Physics and Engineering | Fedorov S.,Galkin Institute for Physics and Engineering | Gumennyk K.,Galkin Institute for Physics and Engineering | Sychanova M.,Galkin Institute for Physics and Engineering
Optik | Year: 2016

The virtual crystal approximation is employed to carry out a numerical modeling of a nonideal one-dimensional Si-based photonic crystal comprised of topologically ordered sets of layers with randomly included doping plasma layers. The constructed model proves efficient for evaluation of the photonic band gap as a function of plasma layer concentration. The presence of defect layers is shown to significantly alter the photonic spectrum of the superstructure. Calculations show that an appropriate choice of dopant concentration is capable of reducing the band gap to zero, thus turning the lattice into a frequency filter. © 2015 Elsevier GmbH. All rights reserved. All rights reserved. Source


Rumyantsev V.V.,Galkin Institute for Physics and Engineering | Fedorov S.A.,Galkin Institute for Physics and Engineering | Sychanova M.V.,Galkin Institute for Physics and Engineering
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2015

In the framework of a virtual crystal approximation, we perform numerical modeling of the transformation of the spectrum of exciton-like electromagnetic excitations of a quasi-2D binary microcavity superlattice, which are caused by the presence of point defects (vacancies). We study the dependence of relative position of energy bands on the concentration of defects (vacancies) in the lattice. © 2015, Pleiades Publishing, Ltd. Source


Rumyantsev V.,Galkin Institute for Physics and Engineering | Rumyantsev V.,Mediterranean Institute of Fundamental Physics | Fedorov S.,Galkin Institute for Physics and Engineering | Gumennyk K.,Galkin Institute for Physics and Engineering | And 4 more authors.
Superlattices and Microstructures | Year: 2016

The virtual crystal approximation is employed to numerically model the propagation of localized electromagnetic excitations through a two-dimensional array of coupled microcavities containing atomic clusters (quantum dots). The constructed model allows for the presence of defects (absence of cavities and/or quantum dots) at certain sites of the supercrystal. We derive the dispersion relations for polaritonic modes as functions of defect concentrations. This permits to evaluate the densities of states of polaritons and their effective masses as well as the band gaps for any prescribed values of defect concentrations. © 2015 Elsevier Ltd. All rights reserved. Source

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