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1
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Electron-Electron Scattering Influence on Hot Electron Transport in Semiconductors

100%
Dedulewicz S., Kancleris Ž.
Acta Physica Polonica A
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1991
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vol. 80
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issue 3
353-356
EN
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_{0}/5 (T_{0} being the characteristic temperature of optical phonon).
2
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Experimental Investigation of Resistive Sensor for High Power Millimetre Wave Pulse Measurement

81%
Simniškis R., Dagys M., Kancleris Ž., Tamošiūnas V.
|
EN
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.
3
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Resistive Sensor for Short High-Power Microwave Pulse Measurement in Millimeter Wave Range

71%
Tamošiūnas V., Kancleris Ž., Dagys M., Simniškis R., Agee F.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
420-424
EN
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.
4
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Experimental Investigation of High Pulse Power Microwave Resistive Sensor with Flat Frequency Response

71%
Kancleris Ž., Simniškis R., Dagys M., Tamošiūnas V., Ragulis P.
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EN
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.
5
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Magnetoresistance of Polycrystalline La_{0.7}Ca_{0.3}MnO_3 Films in a Microwave Magnetic Field

52%
Lučun A., Butkutė R., Maneikis A., Kiprijanovič O., Anisimovas F., Gradauskas J., Sužiedėlis A., Vengalis B., Kancleris Ž., Ašmontas S.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
147-152
EN
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_{0.7}Ca_{0.3}MnO_3 films. The microwave measurements revealed a different character of the temperature-dependent electrical resistance of polycrystalline La_{0.7}Ca_{0.3}MnO_3 films placed in the centre (maximal amplitude of H_{10} wave vector) and at a narrow wall of the wave-guide (reduced H_{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.
6
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Finite-Difference Time-Domain Simulation of Mid- and Far-Infrared Quantum Cascade Lasers

52%
Tamošiūnas V., Kancleris Ž., Dagys M., Simniškis R., Tamošsiūnienė M., Valušis G., Strasser G., Unterrainer K.
Acta Physica Polonica A
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2005
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vol. 107
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issue 1
179-183
EN
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.
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