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Jukna, A.; Kitaygorsky, J.; Pan, D.; Cross, A.; Perlman, A.; Komissarov, I.; Sobolewski, R.; Okunev, O.; Smirnov, K.; Korneev, A.; Chulkova, G.; Milostnaya, I.; Voronov, B.; Gol'tsman, G. |
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Dynamics of hotspot formation in nanostructured superconducting stripes excited with single photons |
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Journal Article |
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2008 |
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Acta Physica Polonica A |
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Acta Physica Polonica A |
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113 |
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3 |
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955-958 |
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SSPD, SNSPD |
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Dynamics of a resistive hotspot formation by near-infrared-wavelength single photons in nanowire-type superconducting NbN stripes was investigated. Numerical simulations of ultrafast thermalization of photon-excited nonequilibrium quasiparticles, their multiplication and out-diffusion from a site of the photon absorption demonstrate that 1.55 μm wavelength photons create in an ultrathin, two-dimensional superconducting film a resistive hotspot with the diameter which depends on the photon energy, and the nanowire temperature and biasing conditions. Our hotspot model indicates that under the subcritical current bias of the 2D stripe, the electric field penetrates the superconductor at the hotspot boundary, leading to suppression of the stripe superconducting properties and accelerated development of a voltage transient across the stripe. |
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1414 |
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Blagosklonskaya, L. E.; Gershenzon, E. M.; Gol'tsman, G. N.; Elant'ev, A. I. |
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Effect of a high magnetic field on the spectrum of donors in InSb |
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Journal Article |
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1977 |
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Fizika i Tekhnika Poluprovodnikov |
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Fizika i Tekhnika Poluprovodnikov |
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11 |
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12 |
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2373-2375 |
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InSb, energy spectrum, donors, high magnetic field |
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Russian |
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Воздействие сильного магнитного поля на спектр доноров в InSb |
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1729 |
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Blagosklonskaya, L. E.; Gershenzon, E. M.; Gol’tsman, G. N.; Elant’ev, A. I. |
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Effect of a strong magnetic field on the spectrum of donors in InSb |
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Journal Article |
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1978 |
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Sov. Phys. Semicond. |
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Sov. Phys. Semicond. |
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11 |
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12 |
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1395-1397 |
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InSb, spectrum of donors, strong magnetic field |
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1725 |
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Nikogosyan, A. S.; Martirosyan, R. M.; Hakhoumian, A. A.; Makaryan, A. H.; Tadevosyan, V. R.; Goltsman, G. N.; Antipov, S. V. |
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Effect of absorption on the efficiency of terahertz radiation generation in the metal waveguide partially filled with nonlinear crystal LiNbO3, DAST or ZnTe |
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2019 |
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J. Contemp. Phys. |
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J. Contemp. Phys. |
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54 |
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1 |
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97-104 |
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nonlinear crystal, THz, waveguide |
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The influence of terahertz (THz) radiation absorption on the efficiency of generation of coherent THz radiation in the system ‘nonlinear-optical crystal partially filling the cross section of a rectangular metal waveguide’ has been investigated. The efficiency of the nonlinear frequency conversion of optical laser radiation to the THz range depends on the loss in the system and the fulfillment of the phase-matching (FM) condition in a nonlinear crystal. The method of partially filling of a metal waveguide with a nonlinear optical crystal is used to ensure phase matching. The phase matching is achieved by numerical determination of the thickness of the nonlinear crystal, that is the degree of partial filling of the waveguide. The attenuation of THz radiation caused by losses both in the metal walls of the waveguide and in the crystal was studied, taking into account the dimension of the cross section of the waveguide, the degree of partial filling, and the dielectric constant of the crystal. It is shown that the partial filling of the waveguide with a nonlinear crystal results in an increase in the efficiency of generation of THz radiation by an order of magnitude, owing to the decrease in absorption. |
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1068-3372 |
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1289 |
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Nikoghosyan, A. S.; Martirosyan, R. M.; Hakhoumian, A. A.; Makaryan, A. H.; Tadevosyan, V. R.; Goltsman, G. N.; Antipov, S. V. |
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Effect of absorption on the efficiency of THz radiation generation in a nonlinear crystal placed into a waveguide |
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2018 |
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Armenian J. Phys. |
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Armenian J. Phys. |
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11 |
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4 |
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257-262 |
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THz, waveguide, nonlinear crystal |
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The effect of THz radiation absorption on the efficiency of generation of coherent THz radiation in a nonlinear optical crystal placed into a metal rectangular waveguide is studied. The efficiency of the nonlinear conversion of optical laser radiation to the THz band is also a function of the phase-matching (PM) condition inside the nonlinear crystal. The method of partial filling of a metal waveguide with a nonlinear optical crystal is used to ensure phase matching. Phase matching was obtained by the proper choice of the thickness of the nonlinear crystal, namely the degree of partial filling of the waveguide. We have studied the THz radiation attenuation caused by the losses in both the metal walls of the waveguide and in the crystal, taking into account the dimension of the cross section of the waveguide, the degree of partial filling and its dielectric constant. |
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1829-1171 |
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1291 |
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