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Optical response of...
Optical response of a cold-electron bolometer array
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- Tarasov, Mikhail, 1954 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Kuzmin, Leonid, 1946 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Edelman, Valerian S. (author)
- Russian Academy of Sciences
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- Kaurova, Natalia (author)
- Moscow State Pedagogical University
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- Fominskii, M. Y. (author)
- National Research University of Electronic Technology (MIET)
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- Ermakov, Andrey B. (author)
- National Research University of Electronic Technology (MIET)
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(creator_code:org_t)
- 2010
- 2010
- English.
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In: JETP Letters. - 1090-6487 .- 0021-3640. ; 92:6, s. 416-420
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Abstract
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- A multielement bolometric receiver system has been developed to measure the power and polarization of radiation at a calculated frequency of 345 GHz. Arrays of ten series-parallel connected cold-electron bolometers have been pairwise integrated into orthogonal ports of a cross-slot antenna. Arrays are connected in parallel in the high-frequency input signal and in series in the output signal, which is measured at a low frequency, and in a dc bias. Such an array makes it possible to increase the output resistance by two orders of magnitude as compared to an individual bolometer under the same conditions of high-frequency matching and to optimize the matching with the JFET amplifier impedance up to dozens of megohms. Parallel connection ensures matching of the input signal to the cross-slot antenna with an impedance of 30 Omega on a massive silicon dielectric lens. At a temperature of 100 mK, a response to the thermal radiation of a thermal radiation source with an emissivity of 0.3, which covers the input aperture of the antenna and is heated to 3 K, is 25 mu V/K. Taking into account real noise, the optical fluctuation dc sensitivity is 5 mK, the estimated sensitivity corresponding to the noise of the amplifier is about 10(-4) K/Hz(1/2), and the noise-equivalent power is about (1-5) x 10(-17) W/Hz(1/2).
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- tunnel-junctions
- electrothermal feedback
Publication and Content Type
- art (subject category)
- ref (subject category)
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