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Author Zubkova, E.; Golikov, A.; An, P.; Kovalyuk, V.; Korneev, A.; Ferrari, S.; Pernice, W.; Goltsman, G. url  doi
openurl 
  Title CWDM demultiplexer using anti-reflection, contra-directional couplers based on silicon nitride rib waveguide Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012179  
  Keywords coarse wavelength-division multiplexing, Si3N4 rib waveguide  
  Abstract We report on the development and fabrication of a 9-channel coarse wavelength-division multiplexing for telecommunication wavelengths (1550 nm) using anti-reflection contra-directional couplers, based on silicon nitride (Si3N4) rib waveguide. The transmitted and reflected spectrum in each channel of the demultiplexer were measured. The average full width at half maximum of the transmitted (reflected) spectra is about 3 nm.  
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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1183  
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Author Kuzin, A.; Kovalyuk, V.; Golikov, A.; Prokhodtsov, A.; Marakhin, A.; Ferrari, S.; Pernice, W.; Gippius, N.; Goltsman, G. url  doi
openurl 
  Title Efficiency of focusing grating couplers versus taper length and angle Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012181  
  Keywords focusing grating coupler  
  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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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1184  
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Author Bakhvalova, T.; Belkin, M. E.; Kovalyuk, V. V.; Prokhodtcov, A. I.; Goltsman, G. N.; Sigov, A. S. url  doi
openurl 
  Title Studying key principles for design and fabrication of silicon photonic-based beamforming networks Type Conference Article
  Year 2019 Publication PIERS-Spring Abbreviated Journal PIERS-Spring  
  Volume Issue (down) Pages 745-751  
  Keywords silicon photonics, TriPleX platform  
  Abstract In the paper, we address key principles for computer-aided design and fabrication of silicon-photonics-based optical beamforming network selecting the optimal approach by simulation and experimental results. To clarify the consideration, the study is conducted on the example of a widely used binary switchable silicon-nitride optical beamforming network based on TriPleX platform. Comparison of simulation results and experimental studies of the prototype shows that the relative error due to technological imperfections does not exceed 3%. According to the estimation, such an error introduces insignificant distortion in the radiation pattern of the referred antenna array.  
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  Notes Approved no  
  Call Number 9017646 Serial 1186  
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Author Prokhodtsov, A.; Golikov, A.; An, P.; Kovalyuk, V.; Goltsman, G.; Arakelyan, S.; Evlyukhin, A.; Kalachev, A.; Naumov, A. url  doi
openurl 
  Title Effect of silicon oxide coating on a silicon nitride focusing grating coupler efficiency Type Conference Article
  Year 2019 Publication EPJ Web Conf. Abbreviated Journal EPJ Web Conf.  
  Volume 220 Issue (down) Pages 02009  
  Keywords grating coupler, SiO2  
  Abstract The dependence of the efficiency of the focusing grating couplers on the period and filling factor before and after deposition of the upper silicon oxide layer was experimentally studied. The obtained data are of practical importance for tunable integrated-optical devices based on silicon nitride platform.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2100-014X ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1188  
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Author Elmanov, I.; Elmanova, A.; Komrakova, S.; Golikov, A.; Kaurova, N.; Kovalyuk, V.; Goltsman, G.; Arakelyan, S.; Evlyukhin, A.; Kalachev, A.; Naumov, A. url  doi
openurl 
  Title Method for determination of resists parameters for photonic – integrated circuits e-beam lithography on silicon nitride platform Type Conference Article
  Year 2019 Publication EPJ Web Conf. Abbreviated Journal EPJ Web Conf.  
  Volume 220 Issue (down) Pages 03012  
  Keywords e-beam lithography, Si3N4  
  Abstract In the work the thicknesses of the e-beam resists ZEP 520A and ma-N 2400 by using non-destructive method were measured, as well as recipe for the high ratio between the Si3N4 and the resists etching rate was determined. The work has a practical application for e-beam lithography of photonic-integrated circuits and nanophotonics devices based on silicon nitride platform.  
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  Series Editor Series Title Abbreviated Series Title  
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  ISSN 2100-014X ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1189  
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Author Elmanova, A.; Elmanov, I.; Komrakova, S.; Golikov, A.; Javadzade, J.; Vorobyev, V.; Bolshedvorskii, S.; Soshenko, V.; Akimov, A.; Kovalyuk, V.; Goltsman, G.; Arakelyan, S.; Evlyukhin, A.; Kalachev, A.; Naumov, A. url  doi
openurl 
  Title Integration of nanodiamonds with NV-centers on optical silicon nitride structures Type Conference Article
  Year 2019 Publication EPJ Web Conf. Abbreviated Journal EPJ Web Conf.  
  Volume 220 Issue (down) Pages 03013  
  Keywords nanodiamonds, NV-centers, Si3N4  
  Abstract In this work we had developed optical structures from silicon nitride for further integration of the nanodiamonds containing NV-centers with them. We have introduced method of the nanodiamonds solution application on the substrates. The work has practical meaning in nanophotonics sphere and in development of optical devices with single-photon sources.  
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  Series Editor Series Title Abbreviated Series Title  
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  ISSN 2100-014X ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1190  
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Author Moshkova, M.; Morozov, P.; Divochiy, A.; Vakhtomin, Y.; Smirnov, K. url  doi
openurl 
  Title Large active area superconducting single photon detector Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012139  
  Keywords SSPD, SNSPD  
  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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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1224  
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Author Titova, N.; Gayduchenko, I. A.; Moskotin, M. V.; Fedorov, G. F.; Goltsman, G. N. url  doi
openurl 
  Title Carbon nanotube based terahertz radiation detectors Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012208 (1 to 5)  
  Keywords carbon nanotubes, CNT  
  Abstract In this paper, we study terahertz detectors based on single quasimetallic carbon nanotubes (CNT) with asymmetric contacts and different metal pairs. We demonstrate that, depending on the contact metallization of the device, various detection mechanisms are manifested.  
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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1270  
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Author Manova, N. N.; Smirnov, E. O.; Korneeva, Yu. P.; Korneev, A. A.; Goltsman, G. N. url  doi
openurl 
  Title Superconducting photon counter for nanophotonics applications Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012147 (1 to 5)  
  Keywords SSPD, SNSPD  
  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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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1271  
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Author Baksheeva, K.; Vdovydchenko, A.; Gorshkov, K.; Ozhegov, R.; Kinev, N.; Koshelets, V.; Goltsman, G. url  doi
openurl 
  Title Study of human skin radiation in the terahertz frequency range Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012076 (1 to 5)  
  Keywords SIS mixer, SIR, applications, medicine, sympathetic nervous system, SNS  
  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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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1272  
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Author Polyakova, M. I.; Florya, I. N.; Semenov, A. V.; Korneev, A. A.; Goltsman, G. N. url  doi
openurl 
  Title Extracting hot-spot correlation length from SNSPD tomography data Type Conference Article
  Year 2019 Publication J. Phys.: Conf. Ser. Abbreviated Journal J. Phys.: Conf. Ser.  
  Volume 1410 Issue (down) Pages 012166 (1 to 4)  
  Keywords SSPD, SNSPD, quantum detector tomography, QDT  
  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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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1273  
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Author Saveskul, N. A.; Titova, N. A.; Baeva, E. M.; Semenov, A. V.; Lubenchenko, A. V.; Saha, S.; Reddy, H.; Bogdanov, S. I.; Marinero, E. E.; Shalaev, V. M.; Boltasseva, A.; Khrapai, V. S.; Kardakova, A. I.; Goltsman, G. N. url  openurl
  Title Superconductivity behavior in epitaxial TiN films points at surface magnetic disorder Type Miscellaneous
  Year 2019 Publication arXiv Abbreviated Journal arXiv  
  Volume Issue (down) Pages 1-10  
  Keywords  
  Abstract We analyze the evolution of the normal and superconducting electronic properties in epitaxial TiN films, characterized by high Ioffe-Regel parameter values, as a function of the film thickness. As the film thickness decreases, we observe an increase of in the residual resistivity, which becomes dominated by diffusive surface scattering for d≤20nm. At the same time, a substantial thickness-dependent reduction of the superconducting critical temperature is observed compared to the bulk TiN value. In such a high quality material films, this effect can be explained by a weak magnetic disorder residing in the surface layer with a characteristic magnetic defect density of ∼1012cm−2. Our results suggest that surface magnetic disorder is generally present in oxidized TiN films.  
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  Notes Approved no  
  Call Number Serial 1278  
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Author Tovpeko, N. A.; Trifonov, A. V.; Semenov, A. V.; Antipov, S. V.; Kaurova, N. S.; Titova, N. A.; Goltsman, G. N. url  openurl
  Title Bandwidth performance of a THz normal metal TiN bolometer-mixer Type Conference Article
  Year 2019 Publication Proc. 30th Int. Symp. Space Terahertz Technol. Abbreviated Journal Proc. 30th Int. Symp. Space Terahertz Technol.  
  Volume Issue (down) Pages 102-103  
  Keywords TiN normal metal bolometer, NMB  
  Abstract We report on the bandwidth performance of the normal metal TiN bolometer-mixer on top of an Al 2 O 3 substrate, which is capable to operate in a wide range of bath temperatures from 77 K – 300 K. The choice of the combination TiN / Al 2 O 3 is related to an advanced heat transport between the film and the substrate in this pair and the sufficient temperature coefficient of resistance. The data were taken at 132.5 – 145.5 GHz with two BWOs as a signal and an LO source. Measurements were taken on TiN films of different thickness starting from 20 nm down to 5 nm coupled into a spiral Au antenna, which improves matching of incoming radiation with the thin TiN fim. Our experiments demonstrate effective heat coupling from a TiN thin film to an Al 2 O 3 substrate (111) boosting gain bandwidth (GB) of TiN bolometer up to 6 GHz for 5 nm thin film. Current results indicate weak temperature dependence of GB on the bath temperature of the TiN bolometer. Theoretical estimations of GB performance meet with experimental data for 5 nm thin TiN films.  
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  Notes Approved no  
  Call Number Serial 1279  
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Author Smirnov, A.; Golubev, E.; Arkhipov, M.; Filina, E.; Pyshnov, V.; Myshonkova, N.; Fedorchuk, S.; Kosmovich, T.; Vinogradov, I.; Baryshev, A.; de Graauw, Th.; Likhachev, S.; Kardashev, N. openurl 
  Title Millimetron Space Observatory: progress in the development of payload module Type Conference Article
  Year 2019 Publication Proc. 30th Int. Symp. Space Terahertz Technol. Abbreviated Journal Proc. 30th Int. Symp. Space Terahertz Technol.  
  Volume Issue (down) Pages 180-181  
  Keywords Millimetron space observatory, primary mirror  
  Abstract Millimetron Space Observatory (MSO) is mission addressed to creation a space cryogenic telescope with aperture about 10-m [1]. Such telescope will allow scientific community to have an astronomical instrument with enormous sensitivity and angular resolution in the submillimeter and far-infrared wavelength ranges. We plan to install at the telescope several FIR and sub-millimeter scientific instruments, which will enable high-resolution imaging and spectroscopy observations with unprecedented sensitivity. At the same time, MSO will enable observations with an extremely high angular resolution (up to 0.1×10 -6 arcsec) as an element of a ground-space very long baseline interferometry system (S-VLBI). Thereby the observatory will contribute breakthrough capability into solution a number of cosmology and fundamental astrophysics questions about the origin and evolution of our Universe, galaxies, stars and other objects [2]. The MSO is divided into two parts: the payload module and the bus module. Due to the complexity of the payload module, most of the recent years of work are focused on it. This module includes an antenna of the telescope, scientific receivers, functional and service systems and a high-gain radio system for transmitting scientific data to Earth. The primary mirror of the telescope will be deployable and consist from of a 3-m aperture central part surrounded by 24 deployable petals. The concept of petals deployment is based on the successfully launched and currently working Radioastron project [3]. The surface accuracy of the deployable 10-m primary mirror of Radioastron achieves about 1 mm in space conditions. The telescope of MSO would have much better surface accuracy – less than 10 μm (rms). In order to achieve this we plan to use an active surface control system based on a wave front sensing. This system will be periodically employed to correct inaccuracies in the positions of the panels caused by different factors. A combination of a high modulus carbon fiber reinforced plastic (CFRP) and a cyanate ester resin as a binder provides a lightweight structure with low moisture absorption, high thermal stability and high stiffness. This combination has been chosen for the material of the primary mirror of telescope and many parts of it. The panels are mounted on the back support structure (Fig. 1) made from CFRP via precision cryogenic actuators. To achieve the required sensitivity of the telescope in the submm/FIR we need to cool antenna down to the temperature less than 10K (goal). It may be possible to do this on-orbit only by a combination of effective radiation cooling and additional active mechanical cooling. A cold space antenna requires minimization and stability of external thermal radiation. This is one of the reasons why MSO will be placed into orbit around the second Earth-Sun Lagrange point (L2). The MSO antenna into L2 will be cooled passively to a temperature about 30 – 60K by a suite of the deployable multi-layer V-groove shields. The following steps to reduce the temperature of the antenna are based on active reducing the thermal loads applied to it. Active mechanical cooling is based on existing close cycling space mechanical coolers. In this work, we will focus on the progress in the development of payload module.  
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  Notes Approved no  
  Call Number Serial 1280  
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Author Kovaluyk, V.; Lazarenko, P.; Kozyukhin, S.; An, P.; Prokhodtsov, A.; Goltsman, G.; Sherchenkov, A. url  openurl
  Title Influence of the phase state of Ge2Sb2Te5 thin cover on the parameters of the optical waveguide structures Type Abstract
  Year 2019 Publication Proc. Amorphous and Nanostructured Chalcogenides Abbreviated Journal Proc. Amorphous and Nanostructured Chalcogenides  
  Volume Issue (down) Pages 47-48  
  Keywords optical waveguides  
  Abstract The fast switching time of Ge-Sb-Te thin films between amorphous and crystalline states initiated by laser beam as well as significant change of their optical properties and the preservation of metastable states for tens of years open wide perspectives for the application of these materials to fully optical devices [1], including high-speed optical memory [2]. Here we study optical properties of the Ge2Sb2Te5 (GST225) thin films integrated with on-chip silicon nitride O-ring resonator. The rib waveguide of the resonator was formed the first stage of e-beam lithography and subsequent reactive-ion etching. We used the second stage of e-beam lithography combining with lift-off method for the formation of GST225 active region on the resonator ring surface. The amorphous GST225 thin films were prepared by magnetron sputtering, and were capped by thin silicon oxide on their tops. The length of the GST225 active region varied from 0.1 to 20 μ m. Crystallization of amorphous thin films was carried out at the temperature of 400 °C for 30 minutes. Auger electron spectroscopy and transmission electron microscopy were used for studying composition and structure of investigated GST225thin films, respectively. It was observed that crystallization of amorphous GST225 film lead to a decrease of the optical power, transmitted through the waveguide. Comparison of the optical transmittance of O-ring resonators before and after the GST225 deposition allowed to identify the change in the Q-factor and the wavelength peak shift. This can be explained by the differences of the complex refractive indexes of GST225 thin films in the amorphous and crystalline states. From the measurement data, the GST225 effective refractive index was extracted depending on the ring waveguide width of the resonator for a telecommunication wavelength of 1550 nm.  
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  Publisher Technical University of Moldova Place of Publication Editor  
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  Area Expedition Conference  
  Notes Poster Approved no  
  Call Number Serial 1281  
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