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Wyświetlanie 1-15 z 42
Tytuł:
Phonon-plasmon interactions in inhomogeneous semiconductor plasma embedded with nanoparticle cluster
Autorzy:
Ghosh, S.
Dubey, P.
Powiązania:
https://bibliotekanauki.pl/articles/1050820.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.30.+q
72.50.+b
73.22.Lp
Opis:
Phonon-plasmon interaction in inhomogeneous piezosemiconductor embedded with a nanoparticle cluster is examined using hydrodynamic model of plasma and macroscopic model of piezoelectric media. Present work dealt with the extensive investigation of acoustic wave amplification characteristics. The effects of density gradient δ and non-dimensional parameter l related to nanoparticle cluster on acoustic gain have been studied with varying medium electron density n_{0e}, wave frequency ω and velocity ratio ϑ_{0}/ϑ_{s}. The results so obtained, infer that the varying inhomogeneity and presence of nanoparticle cluster within the semiconductor plasma medium play decisive role in depicting the gain characteristics of acoustic wave.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1287-1293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Roentgenophase Analysis and Physical Properties of $TlIn_{1-x}Er_xSe_2$ Solid Solutions
Autorzy:
Mustafaeva, S.
Kerimova, E.
Gasanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402129.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.20.-b
71.20.Nr
71.55.-i
72.15.Eb
72.15.Rn
72.20.-i
72.20.Ee
72.20.Jv
72.30.+q
Opis:
The results of high-frequency dielectric measurements on obtained $TlIn_{1-x}Er_xSe_2$ single crystals provided an opportunity to determine the mechanisms of dielectric losses and charge transport, and also to evaluate the density of states at the Fermi level; the average time of charge carrier hopping between localized states, average hopping distance, scattering of trap states near the Fermi level; concentration of deep traps.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 697-699
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Look on the Skin Depth of the Normal Skin Effect in a Metal Submitted to a Frequency-Dependent Electromagnetic Field
Autorzy:
Olszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1400153.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.30+q
Opis:
The theory of the skin depth in metals is re-examined by revision of the conductivity expression entering the Maxwell equations leading to the normal skin effect. In fact this conductivity formula should be improved by considering its special behaviour at low temperatures in case of the presence of the magnetic field. For very pure specimens and very low temperatures the correction of the conductivity tensor leads to the skin depth approximately proportional to the square root of the amplitude strength of the magnetic field.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 750-751
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of Terahertz Radiation by Large-Aperture Photoconductive Antennas in Condition of a High Level Excitation
Autorzy:
Trukhin, V.
Buyskikh, A.
Powiązania:
https://bibliotekanauki.pl/articles/1505694.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.30.+q
41.60.-m
72.20.Jv
Opis:
Theoretical and experimental results about generation coherent terahertz (THz) radiation in photoconductive medium in condition of a high level excitation are presented. Employing self-consistent analytical approach to the set of non-equilibrium Boltzmann equation for charge carriers and Maxwell equations for electromagnetic radiation we have studied the radiation phenomena in non-equilibrium e-h plasma excited in the photoconductive gap of terahertz radiating large-aperture photoconductive antenna by an ultrashort laser pulse. Equally with the effect of the radiation screening, the effect of the non-linear absorption of an optical pump pulse (bleaching of photoconductive medium) was taken into account. It was shown that the effect of nonlinear absorption reconstructs the dynamics of the generation of terahertz radiation and must take into account the effects associated with the spread of the generated wave and the wave of excitation.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 206-209
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Frequency Noise in Modern FET/HEMT Channels Caused by the Excitation of 2D-Plasma Waves
Autorzy:
Shiktorov, P.
Starikov, E.
Gružinskis, V.
Varani, L.
Reggiani, L.
Powiązania:
https://bibliotekanauki.pl/articles/1505464.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
72.30.+q
72.70.+m
Opis:
The problems related with the intrinsic noise in FET/HEMT channels induced by continuous branching of the total current between channel and gate are considered in the framework of a simple analytical model and its predictions on the current-noise spectra. Main branching-induced effects such as the appearance of an additional noise related to the excitation of plasma waves, its dependence on FET/HEMT embedding circuits, interference properties, etc. are analysed.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 117-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Simulation of Noise and THz Generation in InP FET at Excess of Electrons in Channel
Autorzy:
Gružinskis, V.
Shiktorov, P.
Starikov, E.
Powiązania:
https://bibliotekanauki.pl/articles/1505736.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
72.30.+q
Opis:
Electron transport and drain current noise in field effect transistor with $n^+$ $nn^+$ InP channel have been studied by Monte Carlo particle simulation which simultaneously solves the Boltzmann transport and pseudo-2D Poisson equations. It is shown that at gate voltages giving excess electron concentration in n-region of channel the drain current self-oscillations in THz frequency range are possible. The self-oscillations are driven by electron plasma instability.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 215-217
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma Oscillations in Nanotransistors: Application to THz Radiations Detection and Generation
Autorzy:
Marinchio, H.
Sabatini, G.
Palermo, C.
Nouvel, P.
Torres, J.
Varani, L.
Shiktorov, P.
Starikov, E.
Gružinskis, V.
Powiązania:
https://bibliotekanauki.pl/articles/1505457.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Nj
72.20.Ht
72.30.+q
Opis:
By means of a numerical hydrodynamic model, we consider the mechanism of collective plasma oscillations in a field-effect transistor channel under different excitations and biasing conditions. First, we consider the case of a device externally-excited by a harmonic optical beating or an electronic excitation under constant current condition at the drain. Both situations exhibit sharp resonances related to the first odd plasma modes illustrating the possibility of using the HEMT as a terahertz photomixer or detector. Then, we demonstrate that the frequencies, amplitudes and quality factors of the resonances can be strongly modified by varying the drain biasing condition from current- to voltage-driven operation.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 103-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small-Signal Characterization of FET/HEMT for Terahertz Applications
Autorzy:
Starikov, E.
Shiktorov, P.
Gružinskis, V.
Marinchio, H.
Nouvel, P.
Torres, J.
Palermo, C.
Chusseau, L.
Varani, L.
Ziadé, P.
Powiązania:
https://bibliotekanauki.pl/articles/1505675.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
72.30.+q
Opis:
Calculations of the small-signal response of InGaAs HEMTs by using the hydrodynamic approach coupled with a pseudo-2D Poisson equation are performed. The spectra of small-signal admittance and impedance are found to demonstrate series of the resonant peaks corresponding to excitation of plasma waves. Possibilities and conditions of instability onset and THz signal detection are discussed.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 203-205
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THz Emission Induced by an Optical Beating in Nanometer-Length High-Electron-Mobility Transistors
Autorzy:
Nouvel, P.
Torres, J.
Marinchio, H.
Laurent, T.
Palermo, C.
Varani, L.
Teppe, F.
Shiktorov, P.
Starikov, E.
Gruzinskis, V.
Powiązania:
https://bibliotekanauki.pl/articles/1505652.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Nj
72.20.Ht
72.30.+q
Opis:
Experimental results of direct measurement of resonant terahertz emission optically excited in InGaAs HEMT channels are presented. The emission was attributed to two-dimensional plasma waves excited by photogeneration of electron-hole pairs in the HEMT channel at the frequency of the beating of two cw-laser sources. The presence of resonances for the radiation emission in the range of $f_0$ ± 10 GHz (with $f_0$ from 0.3 up to 0.5 THz) detected by a Si-bolometer is found. The intensity of THz emission exhibits a nonlinear growth with increase of the pumping power.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 199-202
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion Law with a Low-Energy Non-Parabolicity for the Charge Carriers in the In_{4}Se_{3} Crystal and Related Effects
Autorzy:
Kharkhalis, L.
Shenderovskii, V.
Sznajder, M.
Bercha, D.
Powiązania:
https://bibliotekanauki.pl/articles/1791362.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.-b
72.30.+q
Opis:
The influence of parameters of the dispersion law exhibiting a low-energy non-parabolicity for the $In_{4}Se_{3}$ crystal on the plasma-electric effect occurring in the non-equilibrium plasma of this semiconductor was investigated under the circumstances that a longitudinal plasma wave propagates in its non-equilibrium plasma.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 952-953
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Conditions for Free-Carrier Grating Formation in InP n⁺nn⁺ Structures using Monte Carlo Technique
Autorzy:
Gružinskis, V.
Shiktorov, P.
Starikov, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813353.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
72.30.+q
72.70.+m
Opis:
Electron transport in 5μm long InP n⁺nn⁺ structure with the n-region doping of $10^{15} cm^{-3}$ is theoretically investigated by the Monte Carlo particle technique at low lattice temperature (T = 10 K), when dominating scattering mechanism is the optical phonon emission. It is shown that at the constant bias a free-carrier grating can be formed inside the n-region. The free-carrier grating formation conditions are analysed by Monte Carlo particle simulation of electric field profiles and noise in the considered InP structure.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 943-946
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge Carrier Heating Effect in Porous Silicon Structures Investigated by Microwaves
Autorzy:
Gradauskas, J.
Šatkovskis, E.
Česnys, A.
Stupakova, J.
Sužiedėlis, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813389.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
78.70.Gq
72.30.+q
Opis:
Diode-like samples, containing porous silicon structures, were investigated by microwave radiation pulses. The resistance of the samples and electromotive force arising over the samples placed in a section of waveguide was measured. Reduction of resistance of the samples was observed with increase in microwave power. More complicated shape of the electromotive force dependence on pulse power was found. It is shown that both effects could be explained by models based on a concept of carrier heating by microwave radiation.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 993-996
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent Terahertz Radiation Generation Assisted by Low-Temperature Optical Phonon Emission: Achievements and Perspectives
Autorzy:
Shiktorov, P.
Starikov, E.
Gružinskis, V.
Varani, L.
Reggiani, L.
Powiązania:
https://bibliotekanauki.pl/articles/1813188.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
72.30.+q
73.63.Hs
Opis:
The conditions for THz radiation generation caused by electron transite time resonance in momentum and real spaces under low-temperature optical-phonon emission are analyzed. It is shown that such a phenomenon provides a unique possibility to realize the sub-THz and THz radiation generation at the border of the electrooptical and electronic techniques by using both the approaches: (i) amplification of transverse electromagnetic waves in 3D bulk materials and 2D quantum wells, and (ii) longitudinal current instabilities in submicron and overmicron n⁺nn⁺ diodes.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 795-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Few-Cycle Laser Pulses: The Carrier-Envelope Phase, Its Role in the THz Emission from Laser-Generated Plasmas and a New Way to Measure It
Autorzy:
Kress, M.
Löffler, T.
Thomson, M.
Roskos, H.
Dörner, R.
Gimpel, H.
Zrost, K.
Ergler, T.
Moshammer, R.
Morgner, U.
Ullrich, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813184.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Re
72.30.+q
78.47.-p
Opis:
Terahertz emission from laser-generated air plasmas has recently been identified as an interesting source for THz radiation. High intensities and a large bandwidth of the THz pulses can be achieved. We briefly review several mechanisms which were employed to generate the quasi-static dipole moment needed for the optical rectification process. This leads us to a discussion of a specific application of THz emission from an air plasma, namely the investigation of the carrier-envelope phase of few-cycle optical pulses. Such pulses of a duration of less than 10 fs induce a spatial charge asymmetry in the plasma directly via non-linear tunneling ionization. The asymmetry, and with it the emission of the THz radiation from the plasma, depend on the carrier-envelope phase, with the consequence that one can determine the phase by measurement of the amplitude and polarity of the THz pulse.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 769-776
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Influence on the Hot-Electron Noise Reduction in GaAs Operating under Periodic Signals
Autorzy:
Persano Adorno, D.
Capizzo, M.
Pizzolato, N.
Powiązania:
https://bibliotekanauki.pl/articles/1813386.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.70.+m
05.40.Ca
72.30.+q
Opis:
A Monte Carlo study of the role of the frequency on the hot-electron intrinsic noise reduction in an n-type GaAs bulk driven by two mixed cyclostationary electric fields is presented. Previous numerical results showed the possibility to reduce the diffusion noise under specific wave-mixing conditions. In this work the variations of the noise properties are investigated by computing and integrating the spectral density of the velocity fluctuations. We found that the effect of reduction of the noise level due to the addition of a second field at twice frequency is almost independent of the frequency.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 979-983
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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