arXiv subjects

A. A. Panteleev

Publications and source records attributed to A. A. Panteleev.

5 recordsLinked to original sources

arXiv2010

Quantum interference and local field effects in a medium of V-type three-level atoms

We study the intrinsic optical bistability displayed by a small sample of $V$-type three-level atoms induced by the near dipole-dipole interaction. The use of the coherent state properties in the limit of the generalized second-order Born approximation for BBGKY-hierarchy of equations for the reduced density operators allows one to derive the operator describing the near dipole-dipole interaction (local field correction) with interference terms involving no additional assumptions. The dynamics of populations of the excited states and the total spontaneous intensity are analysed as functions of the external laser field strength allowing for the off-diagonal structure of the local field and relaxation operators.

quant-ph↗

arXiv2010

Emission spectra and intrinsic optical bistability in a two-level medium

Scattering of resonant radiation in a dense two-level medium is studied theoretically with account for local field effects and renormalization of the resonance frequency. Intrinsic optical bistability is viewed as switching between different spectral patterns of fluorescent light controlled by the incident field strength. Response spectra are calculated analytically for the entire hysteresis loop of atomic excitation. The equations to describe the non-linear interaction of an atomic ensemble with light are derived from the Bogolubov-Born-Green-Kirkwood-Yvon hierarchy for reduced single particle density matrices of atoms and quantized field modes and their correlation operators. The spectral power of scattered light with separated coherent and incoherent constituents is obtained straightforwardly within the hierarchy. The formula obtained for emission spectra can be used to distinguish between possible mechanisms suggested to produce intrinsic bistability.

quant-ph↗

arXiv2006

An antisymmetric plasmon resonance in coupled gold nanoparticles as a sensitive tool for detection of local index of refraction

A nanofabricated regular array of coupled gold nano-pillars is employed to detect local indices of refraction of different liquids using a shift of an antisymmetric plasmon resonance peak observed in the reflection spectra. The peak spectral position is found to be a unique function of the local refractive index for a wide range of indices. We discuss possible applications of the fabricated nanostructured arrays in bio and chemical sensors.

physics.optics↗

arXiv2004

Quantum interference effects in degenerate systems. Spontaneous and stimulated radiation

We study the effect of quantum interference on the structure and properties of spontaneous and stimulated transitions in a degenerate V-type three-level atom with an arbitrary total momentum of each state. Explicit expressions for the factors in the terms of the relaxation operator and stimulated transition operator with account of quantum interference effects are obtained. It has been demonstrated that the condition for the dipole transition moments to be parallel is insufficient and for conventional atoms the interference cross terms are zeros for both operators. The conditions when quantum interference influences the properties of the relaxation operators have been analysed. For the stimulated transitions this condition is shown to be anisotropy of the photon field interacting with the atoms. This case is minutely studied for the D-line of alkali metals.

quant-ph↗

arXiv2004

Local field effects and multimode stimulated light scattering in a two-level medium

Scattering of a short (much shorter then the spontaneous lifetime) laser pulse has been considered in a dense resonant medium subject to local field effects. The system was studied in the limit of Hartree-Fock approximation for Bogolubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy of equations for reduced density operators. A closed set of equations for atomic and field density operators was derived to describe stimulated scattering of radiation. Numerically as well as theoretically the capability of multicomponent spectrum with maximums multiple to Rabi frequency has been demonstrated. Relative line intensities in the spectrum were found in the limit of low density.

quant-ph↗