Abstract
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 Ω 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 μV/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/Hz1/2, and the noise-equivalent power is about (1–5) × 10−17 W/Hz1/2.
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Original Russian Text © M.A. Tarasov, L.S. Kuzmin, V.S. Edelman, N.S. Kaurova, M.Yu. Fominskii, A.B. Ermakov, 2010, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 92, No. 6, pp. 460–464
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Tarasov, M.A., Kuzmin, L.S., Edelman, V.S. et al. Optical response of a cold-electron bolometer array. Jetp Lett. 92, 416–420 (2010). https://doi.org/10.1134/S0021364010180116
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DOI: https://doi.org/10.1134/S0021364010180116