2020 |
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Shurakov A, Prikhodko A, Mikhailov D, Belikov I, Kaurova N, Voronov B, et al. Efficiency of a microwave reflectometry for readout of a THz multipixel Schottky diode direct detector. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012156.
Abstract: In this paper we report on the results of investigation of efficiency of a microwave reflectometry for readout of a terahertz multipixel Schottky diode direct detector. Decent capabilities of the microwave reflectometry readout were earlier justified by us for a hot electron bolometric direct detector. In case of a planar Schottky diode, we observed increase of an optical noise equivalent power by a factor of 2 compared to that measured within a conventional readout scheme. For implementation of a multipixel camera, a microwave reflectometer is to be used to readout each row of the camera, and the row switching is to be maintained by a CMOS analog multiplexer. The diodes within a row have to be equipped with filters to distribute the probing microwave signal properly. The simultaneous use of analog multiplexing and microwave reflectometry enables to reduce the camera response time by a factor of its number of columns.
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Simonov NO, Korneeva YP, Korneev AA, Goltsman GN. Enhance of the superconducting properties of the NbN/Au bilayer bridges. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012132 (1 to 4).
Abstract: We experimentally demonstrate strong temperature dependence of the critical current of the superconducting 600-nm-wide and 5-μm-long bridge made of NbN/Au bilayer. The result is achieved due to the proximity effect realized between the highly disordered superconducting NbN layer and low resistive normal-metal Au layer.
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Titova NA, Baeva EM, Kardakova AI, Goltsman GN. Fabrication of NbN/SiNx:H/SiO2 membrane structures for study of heat conduction at low temperatures. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012190.
Abstract: Here we report on the development of NbN/SiNx:H/SiO2-membrane structures for investigation of the thermal transport at low temperatures. Thin NbN films are known to be in the regime of a strong electron-phonon coupling, and one can assume that the phononic and electronic baths in the NbN are in local equilibrium. In such case, the cooling of the NbN-based devices strongly depends on acoustic matching to the substrate and substrate thermal characteristics. For the insulating membrane much thicker than the NbN film, our preliminary results demonstrate that the membrane serves as an additional channel for the thermal relaxation of the NbN sample. That implies a negligible role of thermal boundary resistance of the NbN-SiNx:H interface in comparison with the internal thermal resistance of the insulating membrane.
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Venediktov IO, Elezov MS, Prokhodtsov AI, Kovalyuk VV, An PP, Golikov AD, et al. Study of microheater’s phase modulation for on-chip Kennedy receiver. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012117.
Abstract: In this work we describe phase modulators for several Mach-Zehnder interferometers (MZI) on silicon nitride platform for telecomm wavelength (1550 nm). We obtained current-voltage and phase-voltage curves for these modulators. MZI are needed for experimental realisation of various quantum receivers that can distinguish weak coherent states of light with extremely low error. Thermo-optical (TO) modulation is ensured by microheaters on one of the arms of MZI, which enables the change of the refractive index of the material with temperature. This approach allows to apply the necessary voltage to the golden microheaters to obtain the required phase change. For the on-chip microheaters we demonstrate the dependence of the phase shift on the voltage applied to our on-chip microheaters.
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2019 |
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Baksheeva K, Vdovydchenko A, Gorshkov K, Ozhegov R, Kinev N, Koshelets V, et al. Study of human skin radiation in the terahertz frequency range. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012076 (1 to 5).
Abstract: The radiation of human skin in the terahertz frequency range under the influence of mental stresses has been studied in the current work. An experimental setup for observation of changes in human skin radiation, which occur under the influence of psychological stresses, by means of a superconducting integrated receiver has been developed. More than 30 volunteers participate in these studies, which allows us to verify presence of correlation between the signals from the superconducting integrated terahertz receiver and other sensors that monitor human mental stress.
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Komrakova S, Javadzade J, Vorobyov V, Bolshedvorskii S, Soshenko V, Akimov A, et al. CMOS compatible nanoantenna-nanodiamond integration. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012180.
Abstract: Here we demonstrate CMOS compatible method to deterministically produce nanoantenna with nanodiamonds systems on example of bull-eye antenna on top of on hyperbolic metamaterials. We study the statistics of the placement of nanodiamonds and measure the fluorescence lifetime and the second-order correlation function of NV-centers inside nanodiamonds.
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Kuzin A, Kovalyuk V, Golikov A, Prokhodtsov A, Marakhin A, Ferrari S, et al. Efficiency of focusing grating couplers versus taper length and angle. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012181.
Abstract: Here we experimentally studied dependence of a focusing grating coupler efficiency versus taper length and angle on silicon nitride platform. As a result, we obtained a dependence for the efficiency of a focusing grating coupler on the parameters of the taper length and angle.
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Manova NN, Smirnov EO, Korneeva YP, Korneev AA, Goltsman GN. Superconducting photon counter for nanophotonics applications. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012147 (1 to 5).
Abstract: We develop large area superconducting single-photon detector SSPD with a micron-wide strip suitable for free-space coupling or packaging with multi-mode optical fibres. The detector sensitive area is 20 μm in diameter. In near infrared (1330 nm wavelength) our SSPD exhibits above 30% detection efficiency with low dark counts and 45 ps timing jitter.
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Moshkova M, Morozov P, Divochiy A, Vakhtomin Y, Smirnov K. Large active area superconducting single photon detector. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012139.
Abstract: We present development of large active area superconducting single-photon detectors well coupled with standard 50 μm-core multi-mode fiber. The sensitive area of the SSPD is patterned using the photon-number-resolving design and occupies an area of 40×40 μm2. Using this approach, we have obtained excellent specifications: system detection efficiency of 47% measured using a 900 nm laser and low dark count rate of 100 cps. The main advantages of the approach presented are a very short dead time of the detector of 22 ns and FWHM jitter value of about 130 ps.
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Polyakova MI, Florya IN, Semenov AV, Korneev AA, Goltsman GN. Extracting hot-spot correlation length from SNSPD tomography data. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012166 (1 to 4).
Abstract: We present data of quantum detector tomography for the samples specifically optimized for this problem. Using this method, we take results of hot-spot correlation length of 17 ± 2 nm.
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