Wyniki wyszukiwania - BazTech

1

Photorefractive multiple quantum wells planar waveguide

Weinert-Rączka E., Gajda J., Wichtowski M., Ziółkowski A.

Pomiary Automatyka Kontrola

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2007

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R. 53, nr 6

34-36

EN

New type of planar optical waveguide with a guiding layer consisting of photorefractive multiple quantum well structure is investigated. Results of optical and electro-optical measurements and possible applications for all-optical switching of guided signals are presented.

PL

Opisano nowy rodzaj światłowodu planarnego o warstwie prowadzącej zawierającej fotorefrakcjne studnie kwantowe. Przedstawione są wyniki pomiarów własności optycznych i elektro-optycznych układu oraz pokazane możliwości zastosowania do całkowicie optycznego przełączania sygnałów propagujących się w światłowodzie.

2

Steady state photorefractive gratings in multiple quantum wells at high modulation depth

Wichtowski M., Weinert-Rączka E., Gajda A.

Opto-Electronics Review

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2005

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Vol. 13, No. 2

157-169

EN

The steady-state analytical expressions for the space-charge field harmonics generated by the high contrast interference pattern in biased photorefractive material with ambipolar transport are presented. As an example semi-insulating multiple quantum wells film operating in the Franz-Keldysh geometry was considered. Parameters of photorefractive grating created by a quadratic electro-optic effect were analysed. Calculations based on the band transport model were limited to the low external field case what corresponds to the linear transport regime. In particular, it was found that the photogenerated carriers density has nearly harmonic distribution. Moreover, the fundamental component can be obtained from the linear equations what enables us to improve the solution for the space-charge field in bulk, nonresonant materials described by the classical Kukhtarev's model.

3

Spatial solitons in biased photorefractive media with quadratic electro-optic effect

Ziółkowski A., Weinert-Rączka E.

Opto-Electronics Review

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2005

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Vol. 13, No. 2

135-140

EN

Propagation of optical beams and properties of one-dimensional (1D) spatial solitons in biased photorefractive media with quadratic electro-optic effect are analysed. An exact analytic solution of the corresponding propagation problem is presented as well as a numerical investigation of the evolution of optical beams.

4

Discrete diffraction in an optically induced lattice in photorefractive media with a quadratic electro-optic effect

Staroń G., Weinert-Rączka E., Urban P.

Opto-Electronics Review

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2005

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Vol. 13, No. 2

93-102

EN

Propagation of light in an optically induced waveguide array in biased photorefractive media with a quadratic electro-optic effect is investigated numerically with the beam propagation method. The refractive index distribution of the array is induced by two coherent plane waves interfering in a guiding layer in a photorefractive multiple quantum well (MQW) planar waveguide. The influence of modulation depth and the space period of an interference pattern as well as the external electric field intensity on diffraction properties of the array is analysed. The potential possibility of all-optical switching due to the dependence of the guided wave output distribution on the external waves parameters is shown.

5

Kronika

Fiałkowski K., Weinert-Rączka E., Durakiewicz T., Chałasińska-Macukow K., Majhofer A., Żukowska K., Kiełczewska D.

Postępy Fizyki

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1999

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T. 50, z. 2

103-111

PL

PTF: Medal Smoluchowskiego, Nagrody PTF, Oddział Szczeciński. Nominacje profesorskie. Andrzej Hrynkiewicz doktorem h.c. UMCS. Uhonorowanie polskich fizyków. Spotkanie dziekanów wydziałów fizyki i dyrektorów instytutów fizyki. ECT*. II Festiwal Nauki w Warszawie. Spór o prawa do zaginionego wykładu. Cecylia Wesołowska (1920 - 1998). Fryderyk Reines (1918 - 1998).