"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 10, 2017

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SUPERCONDUCTING HOT-ELECTRON-BOLOMETER MIXERS FOR THE MID-IR

 

Ivan Pentin 1, Matvey Finkel 1, Sergey Maslennikov 1, Yuri Vakhtomin 1, Konstantin Smirnov 1,2, Nataliya Kaurova 1, Gregory Goltsman 1,2

 

1 Physics Department, Moscow State Pedagogical University, Malaya Pirogovskaya st. 28, Moscow 119435, Russia

2 Moscow Institute of Electronics and Mathematics, Higher School of Economics, Moscow 109028, Russia

 

The paper is received on October 11, 2017, after correction - on October 27, 2017

 

Abstract. The work presents the result of development of the NbN superconducting hot-electron-bolometer (HEB) mixer. The sensitive element of the mixer is directly coupled to mid-IR radiation, and doesn’t have planar metallic antenna. Investigations of noise characteristics of NbN HEB mixer were performed at the frequency 28.4 THz (λ = 10.6 µm) by using gas-discharge CW CO2-laser without consideration of optical and electrical losses in the heterodyne receiver. The noise temperature of NbN HEB mixer with the size of the sensitive element 10 µm × 10 µm was 2320 K (~ 1.5hν/kB) at the heterodyne frequency of 28.4 THz. The noise temperature was determined by measuring the Y-factor taking into account the term which describes fluctuations of zero-point oscillations in accordance with the fluctuation-dissipation theorem of Calle-Welton. Isothermal method was used to estimate the absorbed heterodyne radiation power which was 9 µW at the optimal operating point for the minimum noise temperature of NbN HEB mixer.

Keywords: NbN film, hot-electron effect in superconducting, receivers of electromagnetic radiation.

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For citation:

Ivan Pentin, Matvey Finkel, Sergey Maslennikov, Yuri Vakhtomin, Konstantin Smirnov, Nataliya Kaurova, Gregory Goltsman. Superconducting hot-electron bolometer mixed for the mid-IR. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 10. Available at http://jre.cplire.ru/jre/oct17/9/text.pdf. (In Russian)