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Rasulova GK, Brunkov PN, Pentin IV, Kovalyuk VV, Gorshkov KN, Kazakov AY, et al. Mutual synchronization of two coupled self-oscillators based on GaAs/AlGaAs superlattices. Tech Phys. 2011;56(6):826–30.
Abstract: The interaction of self-oscillators based on 30-period weakly coupled GaAs/AlGaAs superlattices is studied. The action of one self-oscillator on the other was observed for a constant bias voltage in the absence of generation of self-sustained oscillations in one of the oscillators. It is shown that induced oscillations in a forced oscillator appear due to excitation of oscillations in the system of coupled oscillators forming the electric-field domain wall at the frequency of one of the higher harmonics of a forcing oscillation.
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Belitsky V, Desmaris V, Dochev D, Meledin D, Pavolotsky A. Towards Multi-Pixel Heterodyne Terahertz Receivers. In: Proc. 22th Int. Symp. Space Terahertz Technol.; 2011.
Abstract: Terahertz multi-pixel heterodyne receivers introduce multiple challenges for their implementation, mostly due to the extremely small dimensions of all components and even smaller tolerances in terms of alignment, linear dimensions and waveguide component surface quality. In this manuscript, we present a concept of terahertz multi-pixel heterodyne receiver employing optical layout using polarization split between the LO and RF. The frontend isbased on a waveguide balanced HEB mixer for the frequency band 1.6 – 2.0 THz. The balanced HEB mixer followsthe layout of earlier demonstrated APEX T2 mixer. However for the mixer presented here, we implemented split-block layout offering inimized lengths of all waveguides and thus reducing the associated RF loss. The micromachining methods employed for producing the mixer housing and the HEB mixer chip are very suitable for producing multiple structures and hence are in-line with requirements of multi-pixel receiver technology. The demonstrated relatively simple mounting of the mixer chip with self-aligning should greatly facilitate the integration of such multi-channel receiver. Index Terms—Instrumentation, Multi-pixel, Terahertz, Waveguide Balanced Mixer.
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Чулкова ГМ, Семёнов АВ, Дивочий АВ, Тархов МА. Сверхпроводниковый однофотонный детектор с разрешением числа фотонов для систем дальней телекоммуникационной связи. Ж радиоэлектрон. 2011;(12):1–6.
Abstract: Рассмотрена возможность применения сверхпроводникового однофотонного детектора, разрешающего число фотонов, в качестве датчика приёмных модулей телекоммуникационных линий. Показано, что для достижения доли ошибочных битов на уровне 10-11 достаточно на два порядка меньшей мощности в оптическом импульсе, чем при использовании существующих приёмных модулей.
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Semenov AV, Devyatov IA, Ryabchun SA, Maslennikov SN, Maslennikova AS, Larionov PA, et al. Absorption of terahertz electromagnetic radiation in dirty superconducting film at arbitrary type of the spectral functions. Rus J Radio Electron. 2011;(10).
Abstract: A problem of absorption of high-frequency electromagnetic field in dirty superconductor is treated within Keldysh technic. Expression for the source term in the kinetic equation for quasiparticle distribution function is derived. The result is significant for deriving a consistent microscopic theory of superconducting detectors for terahertz frequency range, perspective detectors on kinetic inductance of current-biased superconducting strip and on Josephson inductance of tunnel.
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Feresten NL, Thornton JA, Emmett J, Lamichhane P, Epstein L, Kiesow A, et al., editors. Everything: Rocks and Minerals.; 2011.
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Pentin IV, Smirnov AV, Ryabchun SA, Gol’tsman GN, Vaks VL, Pripolzin SI, et al. Heterodyne source of THz range based on semiconductor superlattice multiplier. In: IRMMW-THz.; 2011. p. 1–2.
Abstract: We present the results of our studies of the possibility of developing a heterodyne receiver incorporating a hot-electron bolometer mixer as the detector and a semiconductor superlattice multiplier driven by a reference synthesizer as the local oscillator. We observe that such a local oscillator offers enough power in the terahertz range to pump the HEB into the operating state.
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Ryabchun S, Smirnov A, Pentin I, Vakhtomin Y, Smirnov K, Kaurova N, et al. Superconducting single photon detector integrated with optical cavity. In: Proc. MLPLIT. Modern laser physics and laser-information technologies for science and manufacture; 2011. p. 143–5.
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Maslennikova A, Larionov P, Ryabchun S, Smirnov A, Pentin I, Vakhtomin Y, et al. Noise equivalent power and dynamic range of NBN hot-electron bolometers. In: Proc. MLPLIT. Modern laser physics and laser-information technologies for science and manufacture; 2011. p. 146–8.
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Korneev A, Korneeva Y, Florya I, Voronov B, Goltsman G. Spectral sensitivity of narrow strip NbN superconducting single-photon detector. In: Fiurásek J, Prochazka I, editors. Proc. SPIE. Vol 8072. SPIE; 2011. 80720G (1 to 9).
Abstract: Superconducting single-photon detector (SSPD) is patterned from 4-nm-thick NbN film deposited on sapphire substrate as a 100-nm-wide strip. Due to its high detection efficiency, low dark counts, and picosecond timing jitter SSPD has become a competitor to the InGaAs avalanche photodiodes at 1550 nm and longer wavelengths. Although the SSPD is operated at liquid helium temperature its efficient single-mode fibre coupling enabled its usage in many applications ranging from single-photon sources research to quantum cryptography. In our strive to increase the detection efficiency at 1550 nm and longer wavelengths we developed and fabricated SSPD with the strip almost twice narrower compared to the standard 100 nm. To increase the voltage response of the device we utilized cascade switching mechanism: we connected 50-nm-wide and 10-μm-long strips in parallel covering the area of 10 μmx10 μm. Absorption of a photon breaks the superconductivity in a strip leading to the bias current redistribution between other strips followed their cascade switching. As the total current of all the strips about is 1 mA by the order of magnitude the response voltage of such an SSPD is several times higher compared to the traditional meander-shaped SSPDs. In middle infrared (about 3 μm wavelength) these devices have the detection efficiency several times higher compared to the traditional SSPDs.
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Korneeva YP, Trifonov AV, Vakhtomin YB, Smirnov KV. Design of resonator for superconducting single-photon detector. Rus J Radio Electron. 2011;(12).
Abstract: A resonator for superconducting single-photon detector is designed. Near 60% coupling with a radiation propagating from a dielectric substrate of optical fiber is demonstrated to be achieved for typical values of the detector’s film sheet resistance.
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