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Golikov, A., Kovalyuk, V., An, P., Zubkova, E., Ferrari, S., Pernice, W., et al. (2018). Silicon nitride nanophotonic circuit for on-chip spontaneous four-wave mixing. In J. Phys.: Conf. Ser. (Vol. 1124, 051051).
Abstract: Here we present an integrated nanophotonic circuit for on-chip spontaneous four-wave mixing. The fabricated device includes an O-ring resonator, a Bragg noch-filter as well as a nine-channel arrayed waveguide gratings (AWG) operated in the C-band wavelength range (1550 nm). The measured optical losses of the device (-6.8 dB) as well as a high Q-factor (> 1.2×105) shows a good potential for realizing the spontaneous four-wave mixing on the silicon nitride chip.
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Prokhodtsov, A., An, P., Kovalyuk, V., Zubkova, E., Golikov, A., Korneev, A., et al. (2018). Optimization of on-chip photonic delay lines for telecom wavelengths. In J. Phys.: Conf. Ser. (Vol. 1124, 051052).
Abstract: In this work, we experimentally studied optical delay lines on silicon nitride platform for telecomm wavelength (1550 nm). We modeled the group delay time and fabricated spiral optical delay lines with different waveguide widths and radii as well as measured their transmission. For the half etched rib waveguides we achieved the losses in the range of 3 dB/cm.
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Matyushkin, Y. E., Gayduchenko, I. A., Moskotin, M. V., Goltsman, G. N., Fedorov, G. E., Rybin, M. G., et al. (2018). Graphene-layer and graphene-nanoribbon FETs as THz detectors. In J. Phys.: Conf. Ser. (Vol. 1124, 051054).
Abstract: We report on detection of sub-THz radiation (129-430 GHz) using graphene based asymmetric field-effect transistor (FET) structures with different channel geometry: monolayer graphene, graphene nanoribbons. In all devices types we observed the similar trends of response on sub-THz radiation. The response fell with increasing frequency at room temperature, but increased with increasing frequency at 77 K. Our calculations show that the change in the trend of the frequency dependence at 77 K is associated with the appearance of plasma waves in the graphene channel. Unusual properties of p-n junctions in graphene are highlighted using devices of special geometry.
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Baksheeva, K., Vdovydchenko, A., Gorshkov, K., Ozhegov, R., Kinev, N., Koshelets, V., et al. (2019). Study of human skin radiation in the terahertz frequency range. In J. Phys.: Conf. Ser. (Vol. 1410, 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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Moshkova, M., Morozov, P., Divochiy, A., Vakhtomin, Y., & Smirnov, K. (2019). Large active area superconducting single photon detector. In J. Phys.: Conf. Ser. (Vol. 1410, 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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