The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
V A Mironov - One of the best experts on this subject based on the ideXlab platform.
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Thermal Mechanism of laser-induced THz generation from metal particles
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: D A Fadeev, I V Oladyshkin, V A MironovAbstract:Ultrafast heating of metal nanoparticles by the laser pulse found to be the source of coherent terahertz (THz) radiation due to the heat redistribution processes. Numerical modeling showed that after the femtosecond laser pulse action the time-dependent gradient of the electronic temperature induces low-frequency particle polarization with the characteristic timescale of about fractions of picosecond.
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Thermal Mechanism of laser induced thz generation from a metal surface
Journal of Optics, 2015Co-Authors: I V Oladyshkin, D A Fadeev, V A MironovAbstract:We propose a new theoretical model of terahertz (THz) generation from a metal surface irradiated by femtosecond laser pulses. The Mechanism is based on the inducing of the low-frequency polarization by the inhomogeneous temperature distribution of the electron gas near the surface. We present analytical and numerical results for the characteristic experimental parameters of a laser pulse. The experimentally observed duration of the THz signal (~1 ps) is interpreted as a time of the Thermal energy relaxation after the optical radiation action. The total THz energy as a function of the initial laser pulse characteristics and metal parameters is obtained. The most important experimental features are discussed and interpreted on the basis of the Thermal Mechanism.
I V Oladyshkin - One of the best experts on this subject based on the ideXlab platform.
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Thermal Mechanism of laser-induced THz generation from metal particles
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: D A Fadeev, I V Oladyshkin, V A MironovAbstract:Ultrafast heating of metal nanoparticles by the laser pulse found to be the source of coherent terahertz (THz) radiation due to the heat redistribution processes. Numerical modeling showed that after the femtosecond laser pulse action the time-dependent gradient of the electronic temperature induces low-frequency particle polarization with the characteristic timescale of about fractions of picosecond.
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Thermal Mechanism of laser induced thz generation from a metal surface
Journal of Optics, 2015Co-Authors: I V Oladyshkin, D A Fadeev, V A MironovAbstract:We propose a new theoretical model of terahertz (THz) generation from a metal surface irradiated by femtosecond laser pulses. The Mechanism is based on the inducing of the low-frequency polarization by the inhomogeneous temperature distribution of the electron gas near the surface. We present analytical and numerical results for the characteristic experimental parameters of a laser pulse. The experimentally observed duration of the THz signal (~1 ps) is interpreted as a time of the Thermal energy relaxation after the optical radiation action. The total THz energy as a function of the initial laser pulse characteristics and metal parameters is obtained. The most important experimental features are discussed and interpreted on the basis of the Thermal Mechanism.
M. Pekker - One of the best experts on this subject based on the ideXlab platform.
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Comment on “Non-Thermal Mechanism of weak microwave fields influence on neurons” [J. Appl. Phys. 114, 104701 (2013)]
Journal of Applied Physics, 2016Co-Authors: M. Pekker, Mikhail N. ShneiderAbstract:This comment is directly related to previously published work [M. N. Shneider and M. Pekker, J. Appl. Phys. 114, 104701 (2013)], in which we outlined the effect of a non-Thermal Mechanism of microwave radiation on the activity of neural tissue. In this note, we provide more realistic estimates of the longitudinal sound velocity in the lipid membranes and the corresponding estimates of the microwaveresonance frequencies.
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Non-Thermal Mechanism of weak microwave fields influence on neurons
Journal of Applied Physics, 2013Co-Authors: M. N. Shneider, M. PekkerAbstract:A non-Thermal Mechanism of weak microwave field impact on a nerve fiber is proposed. It is shown that in the range of about 30–300 GHz, there are strongly pronounced resonances associated with the excitation of ultrasonic vibrations in the membrane as a result of interaction with electromagnetic radiation. The viscous dissipation limits the resonances and results in their broadening. These forced vibrations create acoustic pressure, which may lead to the redistribution of the protein transmembrane channels, and thus changing the threshold of the action potential excitation in the axons of the neural network. The influence of the electromagnetic microwave radiation on various specific areas of myelin nerve fibers was analyzed: the nodes of Ranvier, and the initial segment—the area between the neuron hillock and the first part of the axon covered with the myelin layer. It was shown that the initial segment is the most sensitive area of the myelined neurons from which the action potential normally starts.
D A Fadeev - One of the best experts on this subject based on the ideXlab platform.
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Thermal Mechanism of laser-induced THz generation from metal particles
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: D A Fadeev, I V Oladyshkin, V A MironovAbstract:Ultrafast heating of metal nanoparticles by the laser pulse found to be the source of coherent terahertz (THz) radiation due to the heat redistribution processes. Numerical modeling showed that after the femtosecond laser pulse action the time-dependent gradient of the electronic temperature induces low-frequency particle polarization with the characteristic timescale of about fractions of picosecond.
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Thermal Mechanism of laser induced thz generation from a metal surface
Journal of Optics, 2015Co-Authors: I V Oladyshkin, D A Fadeev, V A MironovAbstract:We propose a new theoretical model of terahertz (THz) generation from a metal surface irradiated by femtosecond laser pulses. The Mechanism is based on the inducing of the low-frequency polarization by the inhomogeneous temperature distribution of the electron gas near the surface. We present analytical and numerical results for the characteristic experimental parameters of a laser pulse. The experimentally observed duration of the THz signal (~1 ps) is interpreted as a time of the Thermal energy relaxation after the optical radiation action. The total THz energy as a function of the initial laser pulse characteristics and metal parameters is obtained. The most important experimental features are discussed and interpreted on the basis of the Thermal Mechanism.
Josef Georg Bauer - One of the best experts on this subject based on the ideXlab platform.
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Cathode-Side Current Filaments in High-Voltage Power Diodes Beyond the SOA Limit
IEEE Transactions on Electron Devices, 2013Co-Authors: Roman Baburske, Franz-josef Niedernostheide, Josef Lutz, Hans-joachim Schulze, Elmar Falck, Josef Georg BauerAbstract:An analysis of the plasma front velocities during turnoff of a power diode is used to explain the differences between the formation and the behavior of cathode-side and anode-side filaments. Device simulations show, how cathode-side filaments may trigger a Thermal runaway at the end of a reverse-recovery period of diodes turned off with extremely high current rates operating the diode in a regime far away from the safe operating area. From the transient voltage curve, the analysis of the reverse-recovery charge as a function of the dc-link voltage and an analysis of the turnoff transients in the current-voltage phase space, it is, however, deduced that the appearance of a cathode-side filament by itself does not necessarily lead to diode destruction. The transformation of the initially avalanche-generated filaments into filaments that are essentially driven by Thermal Mechanism seems to be a further important condition for device destruction.
