24 citations · 160 across the 28 of their papers we have counts for
28 papers
The sensitivity of refractive index sensors based on defected 1D photonic crystals: an analytical approach
Nikolay A. Vanyushkin, I. M. Efimov, Ashot H. Gevorgyan
In this paper, an analytical formula for the sensitivity of optical sensors based on one-dimensional photonic crystals (PCs) with a defect was derived for the first time. Based on…
Exceptional points and lines and Dirac points and lines in magnetoactive cholesteric liquid crystals
A. H. Gevorgyan
We investigated the properties of cholesteric liquid crystals (CLCs) being in external static magnetic field directed along the helix axis. We have shown that in the case of the wa…
Dirac points, new photonic band gaps and effect of magnetically induced transparency in dichroic cholesteric liquid crystals with wavelength dependent magnetooptical activity parameter
A. H. Gevorgyan
We investigated the properties of dichroic cholesteric liquid crystals (CLCs) being in external static magnetic field directed along helix axis. We have shown that in the case of t…
A white laser with chirped photonic crystals
A. H. Gevorgyan, N. A. Vanyushkin, I. M. Efimov
We report the results on theoretical investigation about possible simultaneous laser generation in all, closely spaced modes of chirped photonic crystals layer in all visible regio…
And again, about lasing threshold, light localization, and density of states
N. A. Vanyushkin, A. H. Gevorgyan
We investigated numerically the relationship between the lasing threshold, the density of states (DOS), and field localization in 1D photonic crystals (PC) for off-axis laser actio…
Defected photonic crystal-based sensor with enhanced performance
I. M. Efimov, N. A. Vanyushkin, A. H. Gevorgyan
We propose an improved structure of an optical biosensor based on a photonic crystal (PC) with a defect layer (DL), which can detect the concentration of SARS-CoV-2 in water by def…
Polarometric Method of Plasma Diagnostics
Koryun B. Oganesyan, Krzysztof Dzierdzega, Peter Kopcansky
The polarization plane rotation angle of probe signal in plasma is calculated. The estimates of the residual gas average density and the average magnitude of the magnetic field in…
Optical biosensor based on a photonic crystal with a defective layer designed to determine the concentration of SARS-CoV-2 in water
I. M. Efimov, N. A. Vanyushkin, A. H. Gevorgyan +1
We propose a new optical biosensor based on a photonic crystal with a defect layer, which can determine the SARS-CoV-2 concentration in water by the defect mode shift. Two models o…
Scattering of a plane wave by an inhomogeneous 1D dielectric layer with gradient refractive index
N. A. Vanyushkin, A. H. Gevorgyan, S. S. Golik
We propose a new method for calculating reflection and transmission coefficients for an arbitrarily polarized electromagnetic plane wave incident on a one-dimensional dielectric me…
Dirac points in helically structured 1D photonic crystals
A. H. Gevorgyan
We reported about observation of Dirac points in a helically structured 1D photonic crystals, moreover, both as in the presence of longitudinal magnetic field as its absence. We ob…
Magnetically induced transmission/absorption in chiral liquid crystals
A. H. Gevorgyan
We report the discovery, theoretically, of new effects, namely, the effects of magnetically induced transparency/absorption. The effects are observed in a magnetically active helic…
Effect of Anisotropy on Defect Mode Peculiariries in Chiral Liquid Crystals
A. H. Gevorgyan, K. B. Oganesyan
The effect of anisotropy on defect mode peculiarities in cholesteric liquid crystals is investigated. The problem is solved by Ambartsumians layer addition modified method. Two cas…
The cross sections for inelastic neutron scattering and radiative capture in the field of a light wave
E. A. Ayryan, A. H. Gevorgyan, I. V. Dovgan +1
The mixing of the levels of a compound nucleus in the field of a high-intensity light wave is considered. The cross sections for inelastic neutron scattering and radiative capture…
Absorption and Emission Dependences on Defect in CLC
A. H. Gevorgyan, K. B. Oganesyan, Yu. V. Rostovtsev +2
The influence of the defect position on absorption and emission in the cholesteric liquid crystal with an isotropic defect inside is studied. It is shown that for non-diffracting c…
The Effect of Defect Layer on Lasing in Cholesteric Liquid Crystal
A. H. Gevorgyan, K. B. Oganesyan, N. Sh. Izmailian +9
The photonic density of states (PDS) of eigen polarizations (EPs) in cholesteric liquid crystal (CLC) cells with a defect layer inside are calculated. The dependences for the PDS a…
The Influence of Absorption and Gain on Photonic Density of States
A. H. Gevorgyan, K. B. Oganesyan, N. Sh. Izmailian +8
The photonic density of states (PDS) of the eigen polarizations (EPs) in cholesteric liquid crystal (CLC) cells are calculated. The exact analytic expressions for the reflection an…
Threshold behavior of free electron lasers without inversion
Dmitry N. Klochkov, Ashot H Gevorgyan, Koryun B. Oganesyan +4
The interaction between noncolinear laser and relativistic electron beams in static magnetic undulator has been studied within the framework of dispersion equations. For a free-ele…
Permanent Magnets Undulator for Terahertz FEL
M. L. Petrosyan, L. A. Gabrielyan, Yu. R. Nazaryan +5
The terahertz FEL ferromagnetic undulator has been created. The length of the undulator period is 9cm, number of the periods is 27. By means of selection and redistribution of magn…
Polarization Properties of the Cholesteric Liquid Crystals
A. H. Gevorgyan, M. Z. Harutyunyan, K. B. Oganesyan +5
In the present paper, we investigate the polarization properties of the cholesteric liquid crystals (CLCs) with an isotropic/anisotropic defect inside them. Possibilities of amplif…
Radiation Peculiarities in Chiral Photonic Crystals
A. H. Gevorgyan, K. B. Oganesyan, E. A. Ayryan +2
The peculiarities of defect modes and reflection spectra of chiral photonic crystals (CPC) with an isotropic defect for various thicknesses of the defect layer was investigated. Th…
Physics of Chiral Photonic Crystals with Defect
Ashot H. Gevorgyan, Koryun B. Oganesyan, Edik A. Ayryan +3
Specific features of the defect modes of cholesteric liquid crystals (CLCs) with an isotropic defect, as well as their photonic density of states, Q factor, and emission, have been…
Cholesteric liquid crystals with tunable defect inside
A. H. Gevorgyan, K. B. Oganesyan, E. A. Ayryan +2
Peculiarities of the defect modes of cholesteric liquid crystals (CLCs) with an isotropic/anisotropic defect inside are investigated. The influence of the defect layer thickness an…
Physics of Cold Atomic Fermi Gases
E. A. Ayryan, K. G. Petrosyan, A. H. Gevorgyan +2
We consider a cold two-species atomic Fermi gas confined in a trap. We combine the Hermitian coupling between the states (we assume them to be the states with different spins) with…
Electrons for Detection of Casimir Photons
Edik A. Ayryan, Karen G. Petrosyan, Ashot H. Gevorgyan +2
We propose a method for the detection of a dynamical Casimir effect. Assuming that the Casimir photons are being generated in an electromagnetic cavity with a vibrating wall (dynam…