| 1. |
- Tarasov, Mikhail, 1954, et al.
(författare)
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Fabrication of nis and sis nanojunctions with aluminum electrodes and studies of magnetic field influence on iv curves
- 2021
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Ingår i: Electronics (Switzerland). - : MDPI AG. - 2079-9292. ; 10:23
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Tidskriftsartikel (refereegranskat)abstract
- Samples of superconductor–insulator–superconductor (SIS) and normal metal–insulator– superconductor (NIS) junctions with superconducting aluminum of different thickness were fabricated and experimentally studied, starting from conventional shadow evaporation with a suspended resist bridge. We also developed alternative fabrication by magnetron sputtering with twostep direct e-beam patterning. We compared Al film grain size, surface roughness, resistivity deposited by thermal evaporation and magnetron sputtering. The best-quality NIS junctions with large superconducting electrodes approached a resistance R(0)/R(V2Δ) factor ratio of 1000 at 0.3 K and over 10,000 at 0.1 K. At 0.1 K, R(0) was determined completely by the Andreev current. The contribution of the single-electron current dominated at V > VΔ/2. The single-electron resistance extrapolated to V = 0 exceeded the resistance R(V2Δ) by 3 × 109. We measured the influence of the magnetic field on NIS junctions and described the mechanism of additional conductivity due to induced Abrikosov vortices. The modified shape of the SINIS bolometer IV curve was explained by Joule overheating via NIN (normal metal–insulator–normal metal) channels.
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| 2. |
- Agulo, Ian Jasper, 1974, et al.
(författare)
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Effective Electron Microrefrigeration by SIN Tunnel Junctions with Advanced Geometry of Electrodes and Normal Metal Traps
- 2004
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Ingår i: Nanotechnology. ; 15, s. S224-S228
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate effective electron cooling of the normal metal strip by superconductor-insulator-normal metal (SIN) tunnel junctions. The improvement was achieved by two methods: first by using an advanced geometry of the superconducting electrodes for more effective removal of the quasiparticles; and second, by adding a normal metal trap just near the cooling junctions. With simple cross geometry and without normal metal traps, the decrease in electron temperature is 56 mK. With the advanced geometry of the superconducting electrodes, the decrease in electron temperature is 129 mK. With the addition of the normal metal traps, the decrease in electron temperature is 197 mK.
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| 3. |
- Burmistrov, Eugeny, 1983, et al.
(författare)
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A planar picoamperemeter based on a superconducting quantum interferometer
- 2006
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Ingår i: J. Communications Technol. and Electron.. ; 51:11, s. 1319-1324
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Tidskriftsartikel (refereegranskat)abstract
- An optimized picoamperemeter based on a superconducting quantum interferometer device (SQUID) for a metal cold-electron bolometer is fabricated and experimentally studied. The intrinsic SQUID current noise caused by the input coil is estimated to be less than 1 pA/Hz@1/2. Owing to the application of modulation electronics, current sensitivity in the input coil reaches 5 pA/Hz@1/2 in the frequency band from 10 Hz to 10 kHz.
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| 4. |
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| 5. |
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| 6. |
- Kuzmin, Leonid, 1946, et al.
(författare)
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Superconducting subterahertz fast nanoswitch
- 2007
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Ingår i: JETP Letters. - : Pleiades Publishing Ltd. - 1090-6487 .- 0021-3640. ; 86:4, s. 275-277
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Tidskriftsartikel (refereegranskat)abstract
- A superconducting thin-film nanoswitch for the subterahertz frequency range has been proposed, developed, fabricated, and tested. The switch makes it possible to modulate the microwave signal or switch it between two branches of a circuit with low losses and high speed. The switch can be naturally integrated with superconducting high-sensitive detectors. Its application makes it possible to avoid the use of massive slow mechanical modulators and to improve the measurement accuracy in decisive astrophysical experiments such as the investigation of the anisotropy of the cosmic microwave background.
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| 7. |
- Lemzyakov, S., et al.
(författare)
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Experimental study of a SINIS detector response time at 350 GHz signal frequency
- 2018
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Ingår i: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 969:1
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Konferensbidrag (refereegranskat)abstract
- Response time constant of a SINIS bolometer integrated in an annular ring antenna was measured at a bath temperature of 100 mK. Samples comprising superconducting aluminium electrodes and normal-metal Al/Fe strip connected to electrodes via tunnel junctions were fabricated on oxidized Si substrate using shadow evaporation. The bolometer was illuminated by a fast black-body radiation source through a band-pass filter centered at 350 GHz with a passband of 7 GHz. Radiation source is a thin NiCr film on sapphire substrate. For rectangular 10÷100 μs current pulse the radiation front edge was rather sharp due to low thermal capacitance of NiCr film and low thermal conductivity of substrate at temperatures in the range 1-4 K. The rise time of the response was ∼1-10 μs. This time presumably is limited by technical reasons: high dynamic resistance of series array of bolometers and capacitance of a long twisted pair wiring from SINIS bolometer to a room-Temperature amplifier.
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| 8. |
- Mahashabde, Sumedh, 1985, et al.
(författare)
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A distributed-absorber cold-electron bolometer single pixel at 95GHz
- 2015
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 107:9
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Tidskriftsartikel (refereegranskat)abstract
- We describe a Frequency Selective Surface (FSS) based distributed-absorber Cold-Electron Bolometer (CEB) pixel at 95GHz integrated in a multi-moded horn. The FSS provides a resonant interaction with incident mm and sub-mm radiation and defines the bandwidth of the array while the horn provides the matching of the beam to the telescope optics. CEB detectors with matched impedance are integrated within the periodic elements of the FSS and generate a voltage response proportional to the incident optical power in the bandwidth of the FSS. A prototype pixel was designed, fabricated, and characterized at a temperature of 280 mK. We present optical response to blackbody radiation and fit it to the CEB model. For an absorbed power of 50 pW, we estimate an optical responsivity of 1.2×108V/W and a readout dominated Noise Equivalent Power (NEP) of 1.8×10-15 W Hz - 1 / 2. A measured bandwidth of 9GHz of this detector array confirms the frequency selective nature. This prototype represents a possible solution as a detector for the 95GHz channel of the SWIPE instrument on the LSPE balloon-borne telescope. This kind of FSS based mm-wave architecture can be easily scaled to other frequency ranges and used on any other balloon-borne telescope focal planes.
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| 9. |
- Mahashabde, Sumedh, 1985, et al.
(författare)
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A Frequency Selective Surface based focal plane receiver for the OLIMPO balloon-borne telescope
- 2015
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Ingår i: IEEE Transactions on Terahertz Science and Technology. - 2156-342X .- 2156-3446. ; 5:1, s. 145-152
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Tidskriftsartikel (refereegranskat)abstract
- We describe here a focal plane array of Cold-Electron Bolometer (CEB) detectors integrated in a Frequency Selective Surface (FSS) for the 350 GHz detection band of the OLIMPO balloon-borne telescope. In our architecture, the two terminal CEB has been integrated in the periodic unit cell of the FSS structure and is impedance matched to the embedding impedance seen by it and provides a resonant interaction with the incident sub-mm radiation. The detector array has been designed to operate in background noise limited condition for incident powers of 20 pW to 80 pW, making it possible to use the same pixel in both photometric and spectrometric configurations. We present high frequency and dc simulations of our system, together with fabrication details. The frequency response of the FSS array, optical response measurements with hot/cold load in front of optical window and with variable temperature black body source inside cryostat are presented. A comparison of the optical response to the CEB model and estimations of Noise Equivalent power (NEP) is also presented.
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| 10. |
- Mahashabde, Sumedh, 1985, et al.
(författare)
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Focal plane array of thermo-electric bolometers
- 2010
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Ingår i: 21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010; Oxford; United Kingdom; 23 March 2010 through 25 March 2010. - 9781617823626 ; , s. 257-
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Konferensbidrag (refereegranskat)abstract
- Novel concepts of the parallel and series array of Thermo-Electric Bolometers (TEB) with Superconductor-Insulator-Normal (SIN) Tunnel Junctions [1] have been proposed and realized for a distributed focal plane antenna. The arrays are developed for a pixel design based on arrays of TEBs coupled to a distributed slot antenna or dipole antenna [2] similar to array of Cold-Electron Bolometers (CEB) [3,4].
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