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Temnov V.V.,Massachusetts Institute of Technology | Armelles G.,Institute Microelectronica Of Madrid Imm Cnm Csic | Woggon U.,TU Berlin | Guzatov D.,Kupala State University | And 6 more authors.
Nature Photonics | Year: 2010

Surface-plasmon-mediated confinement of optical fields holds great promise for on-chip miniaturization of all-optical circuits. Following successful demonstrations of passive nanoplasmonic devices, active plasmonic systems have been designed to control plasmon propagation. This goal has been achieved either by coupling plasmons to optically active materials or by making use of transient optical nonlinearities in metals via strong excitation with ultrashort laser pulses. Here, we present a new concept in which the active optical component is a metal-ferromagnet-metal structure. It is based on active magneto-plasmonic microinterferometry, where the surface plasmon wave vector in a gold-ferromagnet-gold trilayer system is controlled using a weak external magnetic field. Application of this new technique allows measurement of the electromagnetic field distribution inside a metal at optical frequencies and with nanometre depth resolution. Significant modulation depth combined with possible all-optical magnetization reversal induced by femtosecond light pulses opens a route to ultrafast magneto-plasmonic switching. © 2010 Macmillan Publishers Limited. All rights reserved.

Guzatov D.V.,Kupala State University | Klimov V.V.,Russian Academy of Sciences
Quantum Electronics | Year: 2011

Cross sections of scattering, absorption, and light pressure for a chiral spherical particle in a circularly polarised light field are studied for different values of the radius, dielectric constant, permeability, and parameter of the chiral particle. The conditions are found under which the cross sections of absorption and light pressure differ significantly when nanoparticles are exposed to light with different polarisations, which can be used to improve synthesis of chiral nanoparticles of complex structure. © 2011 Kvantovaya Elektronika and Turpion Ltd.

Klimov V.V.,National Research Nuclear University MEPhI | Zabkov I.V.,Moscow Institute of Physics and Technology | Pavlov A.A.,RAS Lebedev Physical Institute | Guzatov D.V.,Kupala State University
Optics Express | Year: 2014

Eigenmodes of a chiral sphere placed in a dielectric medium were investigated in details. Excitation of these eigenmodes by a plane wave and a chiral molecule radiation was studied both analytically and numerically. It was found that decay rates of "right" and "left" enantiomers are different in the presence of the chiral sphere. Strong dependence of radiation pattern of the chiral molecule placed in the vicinity of the chiral sphere on chirality strength was also demonstrated. An interesting correlation between chirality of sphere and spatial spirality (helicity, vorticity⋯) of the electromagnetic fields in the presence of chiral sphere was observed for the first time. © 2014 Optical Society of America.

Guzatov D.V.,Kupala State University | Klimov V.V.,RAS Lebedev Physical Institute
New Journal of Physics | Year: 2012

Within the framework of nonrelativistic quantum electrodynamics, a theory of spontaneous emission of a chiral molecule located near a chiral (bi-isotropic) spherical particle is developed. It is shown that the structure of photons in the presence of chiral spherical particles differs significantly from the structure of usual transverse electric and transverse magnetic photons. Exact analytical expressions for a spontaneous emission decay rate of a chiral molecule with arbitrary electric and magnetic dipole moments of transition located near a chiral spherical particle with arbitrary parameters, are obtained and analyzed in detail. Simple asymptotes for the case of a nanoparticle are obtained. Substantial influence of even small chirality on a sphere made from dielectric or double negative metamaterial is found. It is shown that by using chiral spherical particles it is possible to effectively control the radiation of a given enantiomer of optically active molecules. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Guzatov D.V.,Kupala State University | Klimov V.V.,RAS Lebedev Physical Institute
New Journal of Physics | Year: 2011

The optical properties of a plasmonic nano-antenna made of two metallic nanospheroids (prolate or oblate) were investigated analytically in quasi-static approximation. It is shown that in clusters of two nanospheroids, three types of plasmonic modes can be present. Two of them can be effectively excited by a plane electromagnetic wave, while the third one can be effectively excited only by a nanolocalized light source (an atom, a molecule or a quantum dot) placed in the gap between the nanoparticles. Analytical expressions for the absorption cross-section, the enhancement of local fields and the radiative decay rate of an excited atom placed near such a nano-antenna are presented and analyzed. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

A possibility of distinguishing information on defects of a substrate and of a periodical microstructure upon their visualization for a composite diffraction element is substantiated. It has been shown for the first time that, for such a diffraction element, it is possible to distinguish separately reflections from macroscopic defects of the substrate and from the diffraction microstructure itself in the interference patterns, using a two-beam interferometer complemented by an optical system of spatial filtration. © 2015, Pleiades Publishing, Ltd.

Lyalikov A.M.,Kupala State University
Technical Physics Letters | Year: 2013

A possibility of combining measurement and testing procedures in interference studies of phase objects is shown for the first time. The possibility of forming several independent interferograms corresponding to the regions of measuring and testing parameter in one interference pattern has been theoretically substantiated and experimentally confirmed for a certain class of phase objects. © 2013 Pleiades Publishing, Ltd.

Khartovskii V.E.,Kupala State University
Automation and Remote Control | Year: 2011

A constructive approach is suggested to the solution of dual problems of the identification and control of the output for linear autonomous difference-differential systems with many lags (delays). The possibility for application of the obtained results to the case of systems of the parabolic type with time lag is illustrated. © 2011 Pleiades Publishing, Ltd.

Guzatov D.V.,Kupala State University
Journal of Experimental and Theoretical Physics | Year: 2016

Analytic expressions for the radiative and nonradiative decay rates for an electric quadrupole source (atom, molecule) in the vicinity of a spherical particle (dielectric, metal) have been derived and analyzed within the classical electrodynamics. It has been shown that the highest increase in the decay rates appears in the quasi-static case, when the wavelength of the transition in question is much larger than the characteristic size of the system formed by the particle and the quadrupole. Asymptotic expressions for the decay rates have been derived for this case. © 2016, Pleiades Publishing, Inc.

Lyalikov A.M.,Kupala State University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2012

To improve the accuracy of the interferometric method of testing the wedge angle of a transparent plate, we propose using nonlinear recording of holograms of the reference and tested plates on different carriers and creating interference patterns that map the deviation of the angle, using higher orders of light diffraction on the holograms, with improved sensitivity. The increasing accuracy of the interferometric method of testing is provided by waves diffracted on holograms of the reference and tested plates in higher diffraction orders. Results of experimental testing of the method are presented. © Pleiades Publishing, Ltd., 2012.

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