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Wyszukujesz frazę "Aleksiejūnas, R." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
High-Speed Quadratic Electrooptic Nonlinearity in dc-Biased InP
Autorzy:
Subačius, L.
Kašalynas, I.
Vingelis, M.
Aleksiejūnas, R.
Jarašiūnas, K.
Powiązania:
https://bibliotekanauki.pl/articles/1179495.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
72.20.Ht
Opis:
We present experimental data on degenerate four-wave mixing as well as simulation results of fast optical nonlinearities in highly-excited semi-insulating InP under applied dc-field. Hot-electron transport governed enhancement of optical nonlinearity is obtained by applying a dc-field of 10-14 kV/cm at full-modulation depth of a light-interference pattern. The hydrodynamic model, which incorporates both free-carrier and photorefractive nonlinearities is used to explain the experimentally observed features. We show that the enhancement of optical nonlinearity is due to the quadratic electrooptic effect.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 280-285
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-Resolved Transient Grating Spectroscopy for Studies of Nonequilibrium Carrier Dynamics in Wide Band-Gap Semiconductors
Autorzy:
Jarašiūnas, K.
Malinauskas, T.
Neimontas, K.
Gudelis, V.
Aleksiejūnas, R.
Powiązania:
https://bibliotekanauki.pl/articles/2046917.pdf
Data publikacji:
2006-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
78.47.+p
78.55.Cr
Opis:
Using interdisciplinary fields relevant to a highly excited semiconductor - nonequilibrium phenomena in high density plasma, light-induced changes of optical properties, and dynamic holography, we developed time-resolved four-wave mixing technique for monitoring the spatial and temporal carrier dynamics in wide band-gap semiconductors. This opened a new possibility to analyse fast electronic processes in a non-destructive "all-optical" way, i.e. without any electrical contacts. This technique allowed evaluation of recombination and transport processes and the determination of important carrier parameters which directly reveal the material quality: carrier lifetime, bipolar diffusion coefficients, surface recombination rate, nonlinear recombination rate, diffusion length, threshold of stimulated recombination. The recent experimental studies of differently grown group III-nitrides (heterostructures and free standing films) as well silicon carbide epilayers by nondegenerate picosecond four-wave mixing are presented.
Źródło:
Acta Physica Polonica A; 2006, 110, 2; 201-209
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transients of Carrier Recombination and Diffusion in Highly Excited GaN Studied by Photoluminescence and Four-Wave Mixing Techniques
Autorzy:
Juršėnas, S.
Miasojedovas, S.
Kurilčik, G.
Žukauskas, A.
Aleksiejūnas, R.
Malinauskas, T.
Sūdžius, M.
Jarašiūnas, K.
Powiązania:
https://bibliotekanauki.pl/articles/2041739.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
72.20.Jv
78.55.Cr
Opis:
Time-resolved photoluminescence and four-wave mixing techniques have been combined for studies of carrier relaxation dynamics in a highly photoexcited GaN epilayer. For a moderate excitation density below 1 mJ/cm$\text{}^{2}$, carrier recombination was due to free carrier capture by deep traps. The characteristic time of carrier capture,τ$\text{}_{e}$=550 ps, was measured under deep trap saturation regime. The ambipolar diffusion coefficient for free carriers, D=1.7 cm$\text{}^{2}$/s, was estimated from the analysis of the transients of the light-induced gratings of various periods. A complete saturation of the four-wave mixing efficiency was observed for the excitation energy density exceeding 1.5 mJ/cm$\text{}^{2}$. The latter saturation effect was shown to be related to electron-hole plasma degeneration, which results in a significant enhancement of carrier recombination rate due to onset of stimulated emission.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 240-244
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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