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Search Results: 1 - 10 of 418156 matches for " S. V. Zhukovsky "
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Constraints on transmission, dispersion, and density of states in dielectric multilayers and stepwise potential barriers with arbitrary layer arrangement
S. V. Zhukovsky,S. V. Gaponenko
Physics , 2007, DOI: 10.1103/PhysRevE.77.046602
Abstract: Normal-incidence transmission and dispersion properties of optical multilayers and one-dimensional stepwise potential barriers in the non-tunneling regime are analytically investigated. The optical paths of every constituent layer in a multilayer structure, as well as the parameters of every step of the stepwise potential barrier, are constrained by a generalized quarter-wave condition. No other restrictions on the structure geometry is imposed, i.e., the layers are arranged arbitrarily. We show that the density of states (DOS) spectra of the multilayer or barrier in question are subject to integral conservation rules similar to the Barnett-Loudon sum rule but ocurring within a finite frequency or energy interval. In the optical case, these frequency intervals are regular. For the potential barriers, only non-periodic energy intervals can be present in the spectrum of any given structure, and only if the parameters of constituent potential steps are properly chosen. Abstract The integral conservation relations derived analytically have also been verified numerically. The relations can be used in dispersion-engineered multilayer-based devices, e.g., ultrashort pulse compressors or ultracompact optical delay lines, as well as to design multiple-quantum-well electronic heterostructures with engineered DOS.
Spectral and polarization effects in deterministically nonperiodic multilayers containing optically anisotropic and gyrotropic materials
S. V. Zhukovsky,V. M. Galynsky
Physics , 2005, DOI: 10.1088/1464-4258/8/6/001
Abstract: Influence of material anisotropy and gyrotropy on optical properties of fractal multilayer nanostructures is theoretically investigated. Gyrotropy is found to uniformly rotate the output polarization for bi-isotropic multilayers of arbitrary geometrical structure without any changes in transmission spectra. When introduced in a polarization splitter based on a birefringent fractal multilayer, isotropic gyrotropy is found to resonantly alter output polarizations without shifting of transmission peak frequencies. The design of frequency-selective absorptionless polarizers for polarization-sensitive integrated optics is outlined.
Elliptical dichroism: operating principle of planar chiral metamaterials
S. V. Zhukovsky,A. V. Novitsky,V. M. Galynsky
Physics , 2009, DOI: 10.1364/OL.34.001988
Abstract: We employ a homogenization technique based on the Lorentz electronic theory to show that planar chiral structures (PCSs) can be described by an effective dielectric tensor similar to that of biaxial elliptically dichroic crystals. Such a crystal is shown to behave like a PCS insofar as it exhibits its characteristic optical properties, namely, co-rotating elliptical polarization eigenstates and asymmetric, direction-dependent transmission for left/right-handed incident wave polarization.
A multifactorial assessment of carcinogenic risks of radon for the population residing in a Russian radon hazard zone
Lezhnin Vladimir L.,Polzik Evgeny V.,Kazantsev Vladimir S.,Zhukovsky Mikhail V.
Archive of Oncology , 2011, DOI: 10.2298/aoo1102003l
Abstract: Background: Results of numerous epidemiologic studies of carcinogenic effects of indoor radon conducted in different countries in the past 40 years remain controversial. To assess the contribution of the residential radon exposure in the development of lung cancer in the population of the Russian region with a high radon hazard we conducted a cancer epidemiology study based on a multifactorial analysis. Methods: The study was conducted in the town of Lermontov situated in the area with high background radon concentrations and lung cancer rates of the Caucasian Mineral Water Region of Russia. High indoor radon levels were found in the houses of urban residents, mostly employed by the mining and chemical enterprise. The cohort consisted of 122 lung cancer cases and 208 controls. Each of 330 study participants was characterized by a set of 23 indices reflecting known lung cancer risk factors. We also collected data on occupational and residential radon exposure of all subjects. Results: The analysis of a combined effect of 23 different lung cancer risk factors based on pattern recognition methods showed that the contribution of the non-occupational radon exposure was only about 2% whereas that of the occupational radon exposure equaled 15%. Conclusion: Our findings showed that the effect of the residential radon exposure on the lung cancer rate was 15-20 times weaker than the effects of the main risk factors such as smoking, occupational hazards, chronic lung diseases, social and household factors, etc., although for the population of Lermontov this factor was 2-3 times stronger than that found in the Ural towns of Russia.
Selective lasing in multimode periodic and non-periodic nanopillar waveguides
S. V. Zhukovsky,D. N. Chigrin,A. V. Lavrinenko,J. Kroha
Physics , 2006, DOI: 10.1002/pssb.200674508
Abstract: We investigate the lasing action in coupled multi-row nanopillar waveguides of periodic or fractal structure using the finite difference time domain (FDTD) method, coupled to the laser rate equations. Such devices exhibit band splitting with distinct and controllable supermode formation. We demonstrate that selective lasing into each of the supermodes is possible. The structure acts as a microlaser with selectable wavelength. Lasing mode selection is achieved by means of coaxial injection seeding with a Gaussian signal of appropriate transverse amplitude and phase profiles. Based on this we propose the concept of switchable lasing as an alternative to conventional laser tuning by means of external cavity control.
Perfect transmission and highly asymmetric light localization in photonic multilayers
Sergei V. Zhukovsky
Physics , 2009, DOI: 10.1103/PhysRevA.81.053808
Abstract: General principles for the existence of perfect transmission resonances in photonic multilayer structures are formulated in terms of light interference described by recurrent Airy formulas. Mirror symmetry in the multilayer is shown to be a sufficient but not necessary condition for perfect transmission resonances. Asymmetric structures displaying perfect transmission in accordance with the proposed principles are demonstrated. A hybrid Fabry-Perot/photonic-crystal structure of the type (BA)^k(AB)^k(AABB)^m is proposed, combining perfect transmission and highly asymmetric electric field localization. Strength and asymmetry of localization can be controlled independently, to be of use in tailoring non-reciprocal behavior of nonlinear all-optical diodes.
Effective Action for an SU(2) Gauge Model with a Vortex
V. Ch. Zhukovsky
Physics , 1999,
Abstract: Effective action of an SU(2) gauge model with a vortex in 4-dimensional space time is calculated in the 1-loop approximation. The minimum of the effective potential is found.
Chiral phase transitions in strong chromomagnetic fields at finite temperature and dimensional reduction
D. Ebert,V. Ch. Zhukovsky
Physics , 1997, DOI: 10.1142/S0217732397002697
Abstract: Dynamical fermion mass generation in external chromomagnetic fields is considered at non--zero temperature. The general features of dynamical chiral symmetry breaking ($D\chi SB$) are investigated for several field configurations in relation to their symmetry properties and the form of the quark spectrum. According to the fields, there arises dimensional reduction by one or two units. In all cases there exists $D\chi SB$ even at weak quark attraction, confirming the idea about the dimensional insensitivity of this mechanism in a chromomagnetic field.
Generation of a QCD-induced Chern-Simons like term in QED
D. Ebert,V. Ch. Zhukovsky
Physics , 1997,
Abstract: A possibility is discussed that new nontrivial Chern-Simons like terms may be generated in (3+1)--dimensional QED Lagrangian, when induced by quark loops interacting with a non-abelian background field in an SU(2) model of QCD.
Free Energy of an SU(2) Model of (2+1)-dimensional QCD in the Constant Condensate Background
V. Ch. Zhukovsky,V. V. Khudyakov
Physics , 1999, DOI: 10.1134/1.1344951
Abstract: Gluon and quark contributions to the thermodynamic potential (free energy) of a (2+1)-dimensional QCD model at finite temperature in the background of a constant homogeneous chromomagnetic field H combined with A_0 condensate are calculated. The role of the tachyonic mode in the gluon energy spectrum is discussed. A possibility of the free energy global minimum generation at nonzero values of H and A_0 condensates is investigated.
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