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Merkel H, Khosropanah P, Yagubov P, Kollberg E. A hot spot mixer model for superconducting phonone–cooled HEB far above the quasipartical band gap. In: Proc. 10th Int. Symp. Space Terahertz Technol. Charlottesville, Virginia; 1999. p. 592–606.
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Ynvesson KS, Kollberg EL. Optimum receiver noise temperature for NbN HEB mixers according to standard model. In: Proc. 10th Int. Symp. Space Terahertz Technol.; 1999. p. 566–82.
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Cherednichenko S, Ronnung F, Gol'tsman G, Gershenzon E, Winkler D. YBa2Cu3O7-δ hot-electron bolometer with submicron dimensions. In: Proc. 10th Int. Symp. Space Terahertz Technol.; 1999. p. 181–9.
Abstract: Photoresponse of YBa2Cu3O7-δ hot-electron bolometers to modulated near-infrared radiation was studied at a modulation .frequenc y var y ing from 0.2 MHz to 2 GHz. Bolometers were _fabricated from a 50 12 M thick film and had in-plane areas of 10x10 , um 2 . 2x0.2 s um', 1x0.2 p.m', and 0.5x0.2 jim. We found that nonequilibrium phonons cool down more effectively for the bolometers with smaller area. For the smallest bolometer the bolometric component in the response is 10 dB less than for the largest one.
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Schubert J, Semenov A, Gol'tsman G, Hübers H-W, Schwaab G, Voronov B, et al. Noise temperature and sensitivity of a NbN hot-electron mixer at frequencies from 0.7 THz to 5.2 THz. In: Proc. 10th Int. Symp. Space Terahertz Technol.; 1999. p. 190–9.
Abstract: We report on noise temperature measurements of a NbN phonon-cooled hot-electron bolometric mixer at different bias regimes. The device was a 3 nm thick bridge with in-plane dimensions of 1.7 x 0.2 gm 2 integrated in a complementary logarithmic spiral antenna. Measurements were performed at frequencies ranging from 0.7 THz up to 5.2 THz. The measured DSB noise temperatures are 1500 K (0.7 THz), 2200 K (1.4 THz), 2600 K (1.6 THz), 2900 K (2.5 THz), 4000 K (3.1 THz) 5600 K (4.3 THz) and 8800 K (5.2 THz). Two bias regimes are possible in order to achieve low noise temperatures. But only one of them yields sensitivity fluctuations close to the theoretical limit.
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Gerecht E, Musante CF, Jian H, Zhuang Y, Yngvesson KS, Dickinson J, et al. Improved characteristics of NbN HEB mixers integrated with log-periodic antennas. In: Proc. 10th Int. Symp. Space Terahertz Technol.; 1999. p. 200–7.
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