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Basiev T.T.,RAS A.M. Prokhorov General Physics Institute | Basieva I.T.,RAS A.M. Prokhorov General Physics Institute | Kornienko A.A.,Vitebsk State Technological University | Osiko V.V.,RAS A.M. Prokhorov General Physics Institute | And 2 more authors.
Journal of Modern Optics | Year: 2012

A systematic analysis of decoherence rates due to electron-phonon interactions for optical transitions of rare-earth dopant ions in crystals is presented in the frame of the point charge model. For this model, the large value of any one of the matrix elements of the unit tensor operator U (k) of rank k for transitions within the 4f-electronic configuration, viz. U2, U4 or U6, is enough to ensure the strong optical transition between different levels, while the Stark-Stark transitions within the multiplet can be characterized by the matrix element U2 alone, the influence of elements U4, U6 being of much smaller order of magnitude and neglected. The circumstance that exactly such Stark-Stark transitions within the multiplet define the efficiency of electron-phonon interaction and, consequently, the decoherence rate (except for the case of lowest, less than approximately 2-4K, temperatures), enables selection of optical transitions which are strong enough and at the same time are characterized by relatively small decoherence rates. Correspondingly, these optical transitions, provided that they lie in an appropriate spectral range and the gap to the nearest neighboring energy level is large enough (>500cm -1) to prevent eventual fast phonon-assisted relaxation, should be considered as prospective for subsequent use in quantum informatics processing and communication. The list of such pre-selected transitions is given; the applicability area and limitations of our approach are discussed. © 2011 Copyright Taylor and Francis Group, LLC. Source


Mensi M.,Laboratoire Of Physique Of La Matiere Vivante | Dukenbayev K.,Laboratoire Of Physique Of La Matiere Vivante | Sekatskii S.K.,Laboratoire Of Physique Of La Matiere Vivante | Sekatskii S.K.,Russian Academy of Sciences | Dietler G.,Laboratoire Of Physique Of La Matiere Vivante
Laser Physics | Year: 2010

A scanning near-field optical microscope (SNOM)-based modification of the method to study the dynamics of single molecule receptor-ligand interactions exploiting the fluorescence imaging by total internal reflection fluorescence microscopy is introduced. The main advantage of this approach consists in the possibility to study the single molecule interaction dynamics with a subwavelength spatial resolution and a submillisecond time resolution. Additionally, due to the much smaller irradiation area and some other technical features, such a modification enables to enlarge the scope of the receptor-ligand pairs to be investigated and to improve the temporal resolution. We briefly discuss corresponding experimental set up with a special accent on the SNOM operation in liquid and present some preliminary results of related investigations. © 2010 Pleiades Publishing, Ltd. Source


Rostova E.,Laboratoire Of Physique Of La Matiere Vivante | Dietler G.,Laboratoire Of Physique Of La Matiere Vivante | Sekatskii S.K.,Laboratoire Of Physique Of La Matiere Vivante
Advanced Electromagnetics | Year: 2015

Nowadays, unique characteristics of surface electromagnetic waves, particularly, surface plasmons supported by a specially designed photonic crystal find numerous applications. We propose to exploit an evident analogy between such a photonic crystal and a structure with a sine-modulated refractive index. The light propagation inside the latter is described by the famous Mathieu’s differential equation. This application of the Mathieu’s equation can be useful for a design of multilayer structures, and also for fundamental understanding of electromagnetic phenomena in inhomogeneous media. © 2015 by Advanced Electromagnetics. All rights reserved. Source


Chibani H.,Laboratoire Of Physique Of La Matiere Vivante | Dukenbayev K.,Laboratoire Of Physique Of La Matiere Vivante | Mensi M.,Laboratoire Of Physique Of La Matiere Vivante | Sekatskii S.K.,Laboratoire Of Physique Of La Matiere Vivante | Dietler G.,Laboratoire Of Physique Of La Matiere Vivante
Ultramicroscopy | Year: 2010

We report the first use of polymethylmethacrylate (PMMA) optical fiber-made probes for scanning near-field optical microscopy (SNOM). The sharp tips were prepared by chemical etching of the fibers in ethyl acetate, and the probes were prepared by proper gluing of sharpened fibers onto the tuning fork in the conditions of the double resonance (working frequency of a tuning fork coincides with the resonance frequency of dithering of the free-standing part of the fiber) reported earlier for the case of glass fibers. Quality factors of the probes in the range 2000-6000 were obtained, which enables the realization of an excellent topographical resolution including state-of-art imaging of single DNA molecules. Near-field optical performance of the microscope is illustrated by the Photon Scanning Tunneling Microscope images of fluorescent beads with a diameter of 100 nm. The preparation of these plastic fiber probes proved to be easy, needs no hazardous material and/or procedures, and typical lifetime of a probe essentially exceeds that characteristic for the glass fiber probe. © 2009 Elsevier B.V. All rights reserved. Source

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