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124 results on '"Kukhtareva, T."'

1. Heavy electrons: Electron droplets generated by photogalvanic and pyroelectric effects

Author

Krasnoholovets, V., Kukhtarev, N., and Kukhtareva, T.

Subjects
Quantum Physics
Abstract

Electron clusters, X-rays and nanosecond radio-frequency pulses are produced by 100 mW continuous-wave laser illuminating ferroelectric crystal of LiNbO_3. A long-living stable electron droplet with the size of about 100 mcm has freely moved with the velocity 0.5 cm/s in the air near the surface of the crystal experiencing the Earth gravitational field. The microscopic model of cluster stability, which is based on submicroscopic mechanics developed in the real physical space, is suggested. The role of a restraining force plays the inerton field, a substructure of the particles' matter waves, which a solitary one can elastically withstand the Coulomb repulsion of electrons. It is shown that electrons in the droplet are heavy electrons whose mass at least 1 million of times exceeds the rest mass of free electron. Application for X-ray imaging and lithography is discussed., Comment: 15 p., 3 figs

Published
2009
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3. Smart photogalvanic running-grating interferometer

Author

Kukhtarev, N.V., Wang, J., Kukhtareva, T., Lyuksyutov, S.F., Edwards, M.E., Reagan, M.A., Jones, J., Buchhave, P., and Bayssie, M.

Subjects
Interferometers -- Research, Interferometers -- Optical properties, Physics
Abstract

Photogalvanic effect produces actuation of periodic motion of macroscopic LiNbO3crystal. This effect was applied to the development of an all-optical moving-grating interferometer usable for optical trapping and transport of algae chlorella microorganisms diluted in water with a concentration of 27 * 10(super 4) ml(super -1).

Published
2005

6. Pyroelectric and photogalvanic crystal accelerators.

Author

Kukhtarev, N. V., Kukhtareva, T. V., Stargell, G., and Wang, J. C.

Subjects
*FERROELECTRIC crystals, *ELECTROSTATIC accelerators, *PYROELECTRICITY, *MATHEMATICAL physics, *POLARIZATION (Electricity), *ELECTRIC potential
Abstract

In this study, we have derived equations for the pyroelectric and photogalvanic contribution to the electrical charging of the photosensitive ferroelectric crystal. Standard photorefractive equations are supplemented by the equation of state for the polarization density following the Devonshire–Ginsburg–Landau (DGL) approach. The photogalvanic voltage and current is considered for a wide intensity range, which includes the cw and the pulsed photoexcitation with high intensities when the impurity is fully ionized and when the traditional linear-recombination approach is not valid. The crystal electrostatic accelerators, based on charging of ferroelectric crystals by pyroelectric and photogalvanic effects, are discussed in relation to the generation of the self-focused electron beam, x rays, and neutrons. [ABSTRACT FROM AUTHOR]

Published
2009
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7. Optical, photoelectric, and photorefractive properties of Ti-doped CdTe crystals.

Author

Gnatenko, Yu. P., Borshch, A.O., Kukhtarev, N., Kukhtareva, T., Faryna, I.O., Volkov, V.I., Bukivskij, P.M., Gamernyk, R.V., Rudenko, V.I., Paranchych, S. Yu., and Paranchych, L.D.

Subjects
CRYSTALS, CADMIUM compounds, TITANIUM
Abstract

The photorefractive characteristics of Ti-doped CdTe semi-insulating crystals were measured. Additional optical and photoelectric measurement confirmed that titanium has advantages over other dopants and that this material has better characteristics for potential applications. The high optical holographic gain coefficient, Γ≈0.60 cm[sup -1], low background absorption, k[sub b]≈0.2 cm[sup -1], high optical quality and homogeneity, and almost monopolar (electronic) photoconductivity show that these materials can be effectively used for both optical and photoelectric applications in the near infrared region. Studies of the optical absorption and photodiffusion current made it possible to determine the nature and energy structure of impurity and intrinsic defects as well as to establish their role in the photorefractive effect. It is shown that the excited impurity [sup 4]T[sub 1](F) state is in resonance with the conduction band. As a result, autoionization of electrons to the conduction band under laser excitation takes place. An energy-level diagram, both of impurity and intrinsic defects, in the CdTe:Ti crystals was constructed. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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8. Concentrators for focal-plane arrays

Author

Caulfield, H.J., Kukhtarev, N., and Kukhtareva, T.

Subjects
Optical instruments -- Research, Focusing (Photography) -- Equipment and supplies, Astronomy, Physics
Abstract

It is generally assumed that lenslet arrays are needed to concentrate image light upon the relatively sparse detector areas in a focal-plane array. These have severe field-of-view difficulties and require considerable space to implement. We show how to manufacture optically parallel arrays of concentrators of controllable size and field of view with photorefractive crystals. Key words: Concentrators, arrays, light channeling.

Published
1994

16. Smart photogalvanic running-grating interferometer

Author

Kukhtarev, N. V., Kukhtareva, T., Edwards, M. E., Jones, J., Bayssie, M., Wang, J., Lyuksyutov, S. F., Reagan, M. A., Buchhave, Preben, Kukhtarev, N. V., Kukhtareva, T., Edwards, M. E., Jones, J., Bayssie, M., Wang, J., Lyuksyutov, S. F., Reagan, M. A., and Buchhave, Preben

Abstract

Photogalvanic effect produces actuation of periodic motion of macroscopic LiNbO3 crystal. This effect was applied to the development of an all-optical moving-grating interferometer usable for optical trapping and transport of algae chlorella microorganisms diluted in water with a concentration of 27×104 ml–1. ©2005 American Institute of Physics

Published
2005

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