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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Shurakov A, Mikhailov D, Belikov I, Kaurova N, Zilberley T, Prikhodko A, et al. Planar Schottky diode with a Γ-shaped anode suspended bridge. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012154.
Abstract: In this paper we report on the fabrication of a planar Schottky diode utilizing a Г-shaped anode suspended bridge. The bridge maintains transition between the top and bottom level planes of a 1.4 µm thick GaAs mesa. To implement the profile of a suspended bridge and inward tilt of a mesa wall adjacent to it, we make use of an anisotropic etching of gallium arsenide. The geometry proposed enables the fabrication of a diode with mesa of an arbitrary thickness to mitigate AC losses in the diode layered structure at terahertz frequencies of interest. For frequencies beyond 1 THz, it is also beneficial to use the geometry for the implementation of n-GaAs/n-InGaAs heterojunction Schottky diodes grown on InP substrate.
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An P, Kovalyuk V, Golikov A, Zubkova E, Ferrari S, Korneev A, et al. Experimental optimisation of O-ring resonator Q-factor for on-chip spontaneous four wave mixing. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051047.
Abstract: In this paper we experimentally studied the influence of geometrical parameters of the planar O-ring resonators on its Q-factor and losses. We systematically changed the gap between the bus waveguide and the ring, as well as the width of the ring. We found the highest Q = 5×105 for gap 2.0 μm and the ring width 2 μm. This work is important for further on-chip SFWM applications since the generation rate of the biphoton field strongly depends on the quality factor as Q3
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Komrakova S, Javadzade J, Vorobyov V, Bolshedvorskii S, Soshenko V, Akimov A, et al. On-chip controlled placement of nanodiamonds with a nitrogen-vacancy color centers (NV). In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051046 (1 to 4).
Abstract: Here we studied the fabrication technique of a kilopixel array of nanodiamonds with a nitrogen-vacancy color centers (NV) on top of the chip and measured the second-order correlation function deep, clearly demonstrated the presence of single-photon sources. The controlled position of nanodiamonds, determined from the measurement of second-order correlation fiction, was realize, as well as the yield of optimized technique equals 12.5% is shown.
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Kovalyuk V, Kahl O, Ferrari S, Vetter A, Lewes-Malandrakis G, Nebel C, et al. On-chip single-photon spectrometer for visible and infrared wavelength range. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051045.
Abstract: Here we show our latest progress in the field of a single-photon spectrometer for the visible and infrared wavelengths ranges implementation. We consider three different on-chip approaches: a coherent spectrometer with a low power of the heterodyne, a coherent spectrometer with a high power of the heterodyne, and an eight-channel single-photon spectrometer for direct detection. Along with high efficiency, spectrometers show high detection efficiency and temporal resolution through the use of waveguide integrated superconducting nanowire single-photon detectors.
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