Autor: Kancleris, Z. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Electron-Electron Scattering Influence on Hot Electron Transport in Semiconductors
Autorzy:: Dedulewicz, S.
Kancleris, Ž.
Tematy:: 72.20.Ht; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1890875.pdf Link otwiera się w nowym oknie
Opis:: Electron-electron scattering has been shown to manifest itself when scattering by optical phonons is of importance. The strongest influence has been observed in the slightly heated electron system at the lattice temperature T ≈ T$\text{}_{0}$/5 (T$\text{}_{0}$ being the characteristic temperature of optical phonon).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simulation of Modes in Terahertz Quantum-Cascade Microring and Microdisk Lasers
Autorzy:: Tamošiūnas, V.
Kancleris, Z.
Tamošiūnienė, M.
Tematy:: 42.50.Pq
42.55.Sa
42.60.Da; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813216.pdf Link otwiera się w nowym oknie
Opis:: In our contribution, we report on finite-difference time-domain simulations of modes in microring and microdisk terahertz quantum-cascade lasers with external radii of 100 μm and less. Our simulations have revealed a possibility of low radiative loss for lowest and second order whispering gallery modes in such devices, even when the effective mode volume is reduced below the cubic wavelength.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Experimental Investigation of Resistive Sensor for High Power Millimetre Wave Pulse Measurement
Autorzy:: Simniškis, R.
Dagys, M.
Kancleris, Ž.
Tamošiūnas, V.
Tematy:: 81.05.-t
81.05.Rm
81.05.Ea; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813483.pdf Link otwiera się w nowym oknie
Opis:: An experimental investigation of a high power millimetre wave pulse sensor is presented. Two groups of sensors with a flat frequency response were fabricated according to results of the optimisation. The frequency response and voltage standing wave ratio were measured and compared with results of the electrodynamical simulations. The largest measured sensitivity variation of the best sensors within waveguide frequency range was±8%. The reasonable agreement between measured and simulated values of the sensitivity was obtained.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Single Temperature Scan Determination of Defect Parameters in DLTS Experiment
Autorzy:: Dobaczewski, L.
Kancleris, Z.
Bonde Nielsen, K.
Peaker, A. R.
Tematy:: 73.40.Lq
71.55.Cn
68.55.Ln; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1968023.pdf Link otwiera się w nowym oknie
Opis:: Many point and extended defects in silicon, and other semiconducting materials, have been relatively well characterised by the standard DLTS technique. In this method the activation energy of carrier emission from the defect is calculated after multiple temperature scans. In this paper we demonstrate a new approach to the technique, in which after a single temperature scan the complete Arrhenius plot can be constructed for defects present in the sample with considerable concentrations. This method is much faster, accurate, and offers a much higher resolution in comparison with the standard DLTS method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Experimental Investigation of High Pulse Power Microwave Resistive Sensor with Flat Frequency Response
Autorzy:: Kancleris, Ž.
Simniškis, R.
Dagys, M.
Tamošiūnas, V.
Ragulis, P.
Tematy:: 07.57.Kp
72.20.Ht
85.30.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1807940.pdf Link otwiera się w nowym oknie
Opis:: Two types of resistive sensors with flat frequency response for microwave pulse power measurements in X-band rectangular waveguide WR-90 up to 100 kW were developed and experimentally investigated. The first type of the sensors demonstrates higher sensitivity and larger output signal, while the second one exhibits better linearity of the output signal. The experimental investigations revealed the sensitivity variation within ± 10% in 8.2-12.2 GHz frequency band.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Resistive Sensor for Short High-Power Microwave Pulse Measurement in Millimeter Wave Range
Autorzy:: Tamošiūnas, V.
Kancleris, Ž
Dagys, M.
Simniškis, R.
Agee, F.
Tematy:: 72.20.Ht
72.30.+q
85.30.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1177568.pdf Link otwiera się w nowym oknie
Opis:: We report on the numerical investigation of the resistive sensor for the 78-118 GHz range. A three-dimensional finite-difference time-domain method was applied to simulate the wave propagation within a waveguide segment with the semiconductor sensor attached to a wider wall of the wave-guide. The electric field distribution, voltage standing-wave ratio and the average electric field dependences on frequency have been determined for several sets of dimensions and specific resistances of the sample. It is demonstrated that a proper selection of the dimensions and specific resistance of the sample can compensate the waveguide dispersion and the decrease of the electron heating effect with frequency. Therefore, a nearly constant sensitivity of the sensor can be obtained for the entire frequency range.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Finite-Difference Time-Domain Simulation of Mid- and Far-Infrared Quantum Cascade Lasers
Autorzy:: Tamošiūnas, V.
Kancleris, Ž.
Dagys, M.
Simniškis, R.
Tamošsiūnienė, M.
Valušis, G.
Strasser, G.
Unterrainer, K.
Tematy:: 72.30.+q
78.66.-w
85.30.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2041682.pdf Link otwiera się w nowym oknie
Opis:: We present simulations of mid- and far-infrared quantum cascade lasers operating with/without external magnetic field. Maxwell-Bloch solver based on the finite-difference time-domain method was used in our investigation. Reduction of the far-infrared quantum cascade laser emission intensity is associated with increased optical losses in highly doped layers when magnetic field is changed from 4.2 T to 6.2 T. A simulated emission spectrum of mid-infrared disc-shaped quantum cascade laser with 60μm radius is consistent with the experimentally observed irregular spacing between quantum cascade laser emission lines.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Magnetoresistance of Polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ Films in a Microwave Magnetic Field
Autorzy:: Lučun, A.
Butkutė, R.
Maneikis, A.
Kiprijanovič, O.
Anisimovas, F.
Gradauskas, J.
Sužiedėlis, A.
Vengalis, B.
Kancleris, Ž.
Ašmontas, S.
Tematy:: 75.47.Gk
75.47.Lx
07.57.Kp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2047240.pdf Link otwiera się w nowym oknie
Opis:: We present new experimental evidence indicating the importance of magnetic field component of microwave field (f=9.4 GHz) for magnetoresistive properties of polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ films. The microwave measurements revealed a different character of the temperature-dependent electrical resistance of polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ films placed in the centre (maximal amplitude of H$\text{}_{10}$ wave vector) and at a narrow wall of the wave-guide (reduced H$\text{}_{10}$ amplitude). Theoretical estimations of the influence of substrate onto distribution of microwave electric and magnetic fields in the waveguide were performed using the finite-difference time-domain method.
Dostawca treści:: Biblioteka Nauki

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