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Search Results: 1 - 10 of 132513 matches for " Dmitry V. Guzatov "
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Engineering of radiation of optically active molecules with chiral nano-meta-particles
Vasily V. Klimov,Dmitry V. Guzatov,Martial Ducloy
Physics , 2011, DOI: 10.1209/0295-5075/97/47004
Abstract: The radiation of optically active (chiral) molecule placed near chiral nanoparticle is investigated. The optimal conditions for engineering of radiation of optically active (chiral) molecules with the help of chiral nanoparticles are derived. It is shown that for this purpose, the substance of the chiral particle must have both \epsilon_and \mu_negative (double negative material (DNG)) or negative \mu_and positive \epsilon_(\mu_negative material (MNG)). Our results pave the way to an effective engineering of radiation of "left" and "right" molecules and to creating pure optical devices for separation of drugs enantiomers.
The influence of chiral spherical particles on the radiation of optically active molecules
Dmitry Guzatov,Vasily Klimov
Physics , 2012, DOI: 10.1088/1367-2630/14/12/123009
Abstract: In the framework of the perturbation theory of the 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 TE or TM photons. Exact analytical expressions for the spontaneous emission radiative 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 details. Simple asymptotes for the case of a nanoparticle are obtained. Substantial influence of even small chirality on a dielectric or "left-handed" sphere is found. It is shown that by using chiral spherical particles it is possible to control effectively the radiation of enantiomers of optically active molecules.
Radiative Decay Engineering by Triaxial Nanoellipsoids
D. V. Guzatov,V. V. Klimov
Physics , 2004, DOI: 10.1016/j.cplett.2005.05.130
Abstract: Radiative decay rates of an atom placed near triaxial nanoellipsoid are investigated in long wavelength approximation. Analytical results are obtained in general case. It is shown that triaxial ellipsoid can be used for efficient control of decay rate of an atom, molecule or quantum dot. For example decay rate near silver ellipsoid can be enhanced by 5 orders of magnitude. It is also shown, that triaxial nanoellipsoid can be used for simultaneous efficient control of absorption and emission rates of fluorophores.
Optical properties of a two-nanospheroid cluster: analytical approach
D. V. Guzatov,V. V. Klimov
Physics , 2010,
Abstract: Optical properties of a plasmonic nano-antenna made of two metallic nanospheroids (prolate or oblate) are investigated analytically in quasistatic 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, a quantum dot) placed in the gap between the nanoparticles. Analytical expressions for absorption and scattering cross-sections, enhancement of a local field, and radiative decay rate of a dipole source placed near such a nano-antenna are presented and analyzed.
Plasmonic atoms and plasmonic molecules
V. V. Klimov,D. V. Guzatov
Physics , 2007, DOI: 10.1007/s00339-007-4115-5
Abstract: The proposed paradigm of plasmonic atoms and plasmonic molecules allows one to describe and predict the strongly localized plasmonic oscillations in the clusters of nanoparticles and some other nanostructures in uniform way. Strongly localized plasmonic molecules near the contacting surfaces might become the fundamental elements (by analogy with Lego bricks) for a construction of fully integrated opto-electronic nanodevices of any complexity and scale of integration.
Strongly localized plasmon oscillations in a cluster of two metallic nanospheres and their influence on spontaneous emission of an atom
V. V. Klimov,D. V. Guzatov
Physics , 2005,
Abstract: The plasmon oscillations in a cluster of two metallic nanospheres are studied theoretically. Particular attention is paid to the case of nearly touching spheres. Simple analytical expressions have been found for the spectra of plasmon oscillations of different symmetry in this case. A new type of the plasmon oscillations, which are strongly localized between the spheres, and which totally disappear at separation of the spheres, has been discovered. The found plasmon oscillations have a dramatic effect on optical properties of an atom localized between the spheres.
Spontaneous emission of an atom placed near a nanobelt of elliptical cross-section
D. V. Guzatov,V. V. Klimov
Physics , 2007, DOI: 10.1103/PhysRevA.75.052901
Abstract: Spontaneous emission of an atom (molecule) placed near a nanocylinder of elliptical cross-section of an arbitrary composition is studied. The analytical expressions have been obtained for the radiative and nonradiative channels of spontaneous decay and investigated in details.
Rationale for $10^{14}$ enhancement factor in single molecule Raman spectroscopy
S. V. Gaponenko,D. V. Guzatov
Physics , 2008,
Abstract: We extend the Purcell's original idea [Phys. Rev. \textbf{69}, 682 (1946)] on modification of photon spontaneous \textit{emission} rate to modification of photon spontaneous \textit{scattering} rate. We find the interplay of local incident field enhancement and local density of photon states enhancement in close proximity to a silver nanoparticle may result in up to $10^{14}$-fold rise of Raman scattering cross-section. Thus single molecule Raman detection is found to be explained by consistent quantum electrodynamic description without any chemical mechanism involved. A model of the so-called "hot points" in surface enhanced spectroscopy has been elaborated as local areas with high Q-factor at incident and scattered (emitted) light frequencies. For verification of the model we consider further experiments including transient Raman experiments to clarify incident field enhancement and scanning near-field optical mapping of local density of photon states.
Plasmon oscillations in ellipsoid nanoparticles: beyond dipole approximation
D. V. Guzatov,V. V. Klimov,M. Yu. Pikhota
Physics , 2008, DOI: 10.1134/S1054660X09170083
Abstract: The plasmon oscillations of a metallic triaxial ellipsoid nanoparticle have been studied within the framework of the quasistatic approximation. A general method has been proposed for finding the analytical expressions describing the potential and frequencies of the plasmon oscillations of an arbitrary multipolarity order. The analytical expressions have been derived for an electric potential and plasmon oscillation frequencies of the first 24 modes. Other higher orders plasmon modes are investigated numerically.
Study of the Electric Explosion of Titanium Foils in Uranium Salts  [PDF]
Leonid I. Urutskoev, Dmitry V. Filippov
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.14034
Abstract: The results of experiments on electroexplosion titanic foil in water solutions of salts of uranium are presented in this paper. It is shown, that as a result of electroexplosion occurs appreciable (to 20%) distortion of an initial isotope parity of uranium. In the most solution parts, observable isotope distortion occurs in favour of enrichment by 235U. At the moment of electroexplosion it was not observed an appreciable stream of the neutrons. By means of Cs label and by methods by α, β, γ-spectrometry and mass-spectrometry it have been shown, that isotope distortion occurs at the expense of non-uniform “disappearance” of both isotopes from a solution. The isotope distortion leads to infringement of the 234Th secular equilibrium in the uranyl solution. The equilibrium infringement between the 234Th and 234mPa, i.e. within the proper thorium decay chain, was observed also. The assumption about that the effects are caused of low-energy nuclear reactions at the moment of electroexplosion is suggested.
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