Low-Noise Sis Receivers for New Radio-Astronomy Projects

Rudakov, K. I.; Дмитриев, П. Н.; Baryshev, A.; Khudchenko, Andrey; Hesper, Ronald; Koshelets, V. P.

doi:10.1007/s11141-020-10001-7

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…These data were Fourier-transformed into a mixer response on the frequency. The experimental data demonstrate a good agreement with the results of numerical simulations [48,49].…”

Section: -275 Ghz Sis-mixer Measurementssupporting

confidence: 80%

“…To make a wideband receiver for the 790-950 GHz frequency range for CHAMP+, we used twin SIS junctions [46,47] (each with an area of 0.5 µm 2 , see Figure 8), coupled by a waveguide probe to the E-field of a rectangular waveguide of 300 × 75 µm. The SIS mixer [48,49] was based on high critical current density Nb/AlN/NbN tunnel junctions included in the NbTiN-Al microstrip line [39]. The microstrip electrodes (320 nm thick bottom NbTiN electrode and a 500 nm thick top electrode made of Al) were separated by a 250 nm SiO 2 insulator.…”

Section: Mixer and Mixer Block Designsmentioning

confidence: 99%

“…The DSB mixer noise temperature was determined by the standard Y-factor measurement method; an absorber at room temperature (295 K) was used as a "hot" load, and an absorber cooled by liquid nitrogen (78 K) was used as a "cold" load [48,49]. Figure 9 shows the SIS receiver output versus the bias voltage measured for 241 GHz LO at 6.5 GHz IF (60 MHz IF filter bandwidth).…”

Section: -275 Ghz Sis-mixer Measurementsmentioning

confidence: 99%

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THz Range Low-Noise SIS Receivers for Space and Ground-Based Radio Astronomy

et al. 2021

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We report on research in the field of low-noise receiving systems in the sub-terahertz (THz) range, carried out in recent years, aimed at developing receivers with quantum sensitivity for implementation in space and ground-based radio telescopes. Superconductor-Insulator-Superconductor (SIS) mixers based on high-quality tunnel junctions are the key elements of the most sensitive sub-THz heterodyne receivers. Motivations and physical background for technology improvement and optimization, as well as fabrication details, are described. This article presents the results of the SIS receiver developments for the 211–275 GHz and 790–950 GHz frequency ranges with a noise temperature in the double sideband (DSB) mode of approximTELY 20 K and 200 K, respectively. These designs and achievements are implemented in the development of the receiving systems for the Russian Space Agency mission “Millimetron”, and for the ground-based APEX (Atacama Pathfinder EXperiment) telescope.

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“…These data were Fourier-transformed into a mixer response on the frequency. The experimental data demonstrate a good agreement with the results of numerical simulations [48,49].…”

Section: -275 Ghz Sis-mixer Measurementssupporting

confidence: 80%

Section: Mixer and Mixer Block Designsmentioning

confidence: 99%

Section: -275 Ghz Sis-mixer Measurementsmentioning

confidence: 99%

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THz Range Low-Noise SIS Receivers for Space and Ground-Based Radio Astronomy

et al. 2021

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“…It is also necessary to compensate for the significant capacitance of the SIS junction (C ≈ 0.085 pFμm 2 ) in order to achieve a low noise temperature. As a result, the impedance of the structure is reduced to a few ohms, and it is necessary to coordinate the final impedance of the SIS junction at a high frequency with the impedance of the waveguide (about 400 Ω), which was done by using a planar structure consisting of segments of coplanar and microstrip lines of Nb/SiO 2 /Nb [99]. The receiving element was made on a quartz substrate with a thickness of 125 μm.…”

Section: Low-noise 211-275 Ghz Band Sis Mixer For Radio Astronomymentioning

confidence: 99%

Superconducting Receivers for Space, Balloon, and Ground-Based Sub-Terahertz Radio Telescopes

Balega

Baryshev

Bubnov

et al. 2020

Radiophys Quantum El

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We give a review of both our own original scientific results of the development of superconducting receivers for sub-terahertz astronomy and the main leading concepts of the global instrumentation. The analysis of current astronomical problems, the results of microwave astroclimate research, and the development of equipment for sub-terahertz radio astronomy studies justify the need and feasibility of a major infrastructure project in Russia to create a sub-terahertz telescope, as well as to enhance the implementation of the ongoing Millimetron and Suffa projects. The following results are discussed: i) superconducting coherent receivers and broadband subterahertz detectors for space, balloon, and ground-based radio telescopes have been developed and tested; ii) ultrasensitive receiving systems based on tunnel structures such as superconductorinsulator -superconductor (SIS) and superconductor -insulator -normal metal -insulatorsuperconductor (SINIS) have been created, fabricated, and examined; iii) a receiving array based on SINIS detectors and microwave readout system for such structures has been implemented; iv) methods for manufacturing high-quality tunnel structures Nb/AlO x /Nb and Nb/AlN/NbN based on niobium films with a current density of up to 30 kA/cm 2 have been developed. Receivers operated at 200 to 950 GHz and having a noise temperature only a factor of 2 to 5 higher than the quantum limit have been created and tested.

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“…The SIS junction on silicon or quartz substrate was formed by etching a three-layer Nb-AlN-NbN structure through a resist mask formed using EBL. After fabrication of the tunnel junction using plasma chemical etching, anodizing was carried out, and then an insulation layer of SiO 2 was applied [13]. In the final stages, the counter NbN electrode and Au contact pads were formed.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Superconducting Nb–AlN–NbN Tunnel Junctions Using Electron-Beam Lithography

et al. 2021

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Mixers based on superconductor–insulator–superconductor (SIS) tunnel junctions are the best input devices at frequencies from 0.1 to 1.2 THz. This is explained by both the extremely high nonlinearity of such elements and their extremely low intrinsic noise. Submicron tunnel junctions are necessary to realize the ultimate parameters of SIS receivers, which are used as standard devices on both ground and space radio telescopes around the world. The technology for manufacturing submicron Nb–AlN–NbN tunnel junctions using electron-beam lithography was developed and optimized. This article presents the results on the selection of the exposure dose, development time, and plasma chemical etching parameters to obtain high-quality junctions (the ratio of the resistances below and above the gap Rj/Rn). The use of a negative-resist ma-N 2400 with lower sensitivity and better contrast in comparison with a negative-resist UVN 2300-0.5 improved the reproducibility of the structure fabrication process. Submicron (area from 2.0 to 0.2 µm2) Nb–AlN–NbN tunnel junctions with high current densities and quality parameters Rj/Rn > 15 were fabricated. The spread of parameters of submicron tunnel structures across the substrate and the reproducibility of the cycle-to-cycle process of tunnel structure fabrication were measured.

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Low-Noise Sis Receivers for New Radio-Astronomy Projects

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Cited by 13 publications

References 19 publications

THz Range Low-Noise SIS Receivers for Space and Ground-Based Radio Astronomy

THz Range Low-Noise SIS Receivers for Space and Ground-Based Radio Astronomy

Superconducting Receivers for Space, Balloon, and Ground-Based Sub-Terahertz Radio Telescopes

Fabrication of Superconducting Nb–AlN–NbN Tunnel Junctions Using Electron-Beam Lithography

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