Autor: Kašalynas, I. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

Skocz do pozycji: 2.

Tytuł:: Infrared Reflectance Kramers-Kronig Analysis by Anchor-Window Technique
Autorzy:: Tumėnas, S.
Kašalynas, I.
Karpus, V.
Arwin, H.
Powiązania:: https://bibliotekanauki.pl/articles/1505484.pdf
Data publikacji:: 2011-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.23.Ft
78.20.Ci
Opis:: An algorithm for the Kramers-Kronig analysis of the reflectivity spectra, based on an anchor-window technique is presented. The high-frequency asymptote, required for the Kramers-Kronig analysis, is determined by minimizing differences between the Kramers-Kronig-deduced optical constants of a system under investigation and known optical constants measured in a small anchor-window. The algorithm is illustrated by applying it for a reconstruction of the optical conductivity σ(ω) of the fci-ZnMgRE quasicrystals in the spectral range of 0.01-6.5 eV from the experimental IR Fourier-transform reflectivity data and the experimental spectral ellipsometry VIS-UV data. The reliability of the suggested Kramers-Kronig analysis technique is confirmed by independent infrared spectral ellipsometry σ(ω) measurements for fci-ZnMgRE.
Źródło:: Acta Physica Polonica A; 2011, 119, 2; 140-142
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 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

Skocz do pozycji: 4.

Tytuł:: Charge Carrier Transport Properties in Single-Walled Carbon Nanotube Fibers
Autorzy:: Ksenevich, V.
Seliuta, D.
Martūnas, Z.
Kašalynas, I.
Valušis, G.
Galibert, J.
Kozlov, M.
Samuilov, V.
Powiązania:: https://bibliotekanauki.pl/articles/1813401.pdf
Data publikacji:: 2008-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.63.Fg
Opis:: Transport properties via temperature dependences of sample resistance R(T) and influence of microwave field of 10 GHz on the conductivity of the single-walled carbon nanotubes fibers are investigated. The R(T) dependences studied within 4.2-300 K can be well approximated by the Mott law for 3D variable range hopping below T=80 K and by typical law for fluctuation-induced tunnelling model within the temperature range 80-300 K. We associate the observed increase in the conductivity with microwave power by increase in hopping probability of the charge carriers between single-walled carbon nanotubes.
Źródło:: Acta Physica Polonica A; 2008, 113, 3; 1039-1042
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Strong Electric Field Driven Carrier Transport Non-Linearities in n-Type GaAs/AlGaAs Superlattices
Autorzy:: Subačius, L.
Venckevičius, R.
Kašalynas, I.
Seliuta, D.
Valušis, G.
Schmidt, J.
Lisauskas, A.
Roskos, H.
Alekseev, K.
Köhler, K.
Powiązania:: https://bibliotekanauki.pl/articles/1505524.pdf
Data publikacji:: 2011-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.65.Cd
06.60.Jn
73.90.+f
Opis:: Nanosecond pulsed technique was used to study and discriminate strong electric field induced effects in carrier transport in silicon doped GaAs/$Al_{0.3}Ga_{0.7}As$ superlattices at room temperature. The experiment shows that the superlattice can serve as gain media to employ parametric phenomena for microwave amplification.
Źródło:: Acta Physica Polonica A; 2011, 119, 2; 167-169
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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