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Wyszukujesz frazę "71.55.Ht" wg kryterium: Temat


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:
Spatiotemporal Transport Processes in Semiconductor Gas Discharge Structure with GaAs Photodetector
Autorzy:
Yűcel Kurt, H.
Salamov, B.
Powiązania:
https://bibliotekanauki.pl/articles/1812045.pdf
Data publikacji:
2008-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
72.20.Ht
Opis:
In a semiconductor gas discharge structure with diameters much larger than an inter-electrode distance, the effects of different parameters (i.e. electrode separation, gas pressure, diameter of the GaAs photodetector, etc.) on electrical breakdown and current oscillations were studied. Non-stationary and non-homogeneous states are generated in the structure, through the spatially uniform irradiation of the semiconductor photodetector. Instabilities occur due to the nonlinear features of the semiconductor photocathode, while the gas discharge serves to visualize transport processes in GaAs. Spatiotemporal variations of current and discharge light emissions are studied with the above-mentioned control parameters. Transformation of the profile and amplitude of the current densities of the filaments in different regions of the current-voltage characteristic are widely studied. Instabilities of spatially non-uniform distributions resulting in the formation of multiple current filaments with increasing voltages above the critical values are observed. A semiconductor gas discharge structure with an N-shaped current-voltage characteristic is analyzed via both the current and discharge light emissions data which shows the electrical instability in the GaAs photodetector.
Źródło:
Acta Physica Polonica A; 2008, 114, 4; 819-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optically Driven Domain Instability and High-Frequency Current Oscillations in Photoexcited GaAs under Nonuniform Electron Heating
Autorzy:
Subačius, L.
Kašalynas, I.
Powiązania:
https://bibliotekanauki.pl/articles/1179478.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
72.20.Ht
Opis:
Fast domain instabilities induced by light-interference pattern in dc-biased semi-insulating GaAs are investigated. Current oscillations in GHz-frequency range are observed due to nonuniform electron heating and domains formation in light-induced grating. Characteristic features of the oscillations under various experimental conditions are presented. Numerical calculations based on the hot-electron hydrodynamic model are used to explain the observed nonlinear features under various external bias and periods of the grating.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 275-279
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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