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Measured Results for NbN Phonon-Cooled Hot Electron Bolometric Mixers at 0.6-0.75 THz, 1.56 THz, and 2.5 THz

Authors:
E. Gerecht, C. F. Musante, H. Jian, K. S. Yngvesson, J. Dickinson, J. Waldman, G. N. Gol'tsman, P. A. Yagoubov, B. M. Voronov, E. M. Gershenzon
Abstract:
NbN Hot Electron Bolometric (HEB) mixers represent a promising approach for achieving receiver noise temperatures of a few times the quantum noise limit at frequencies above 1 THz. These HEB mixers have so far demonstrated a DSB noise temperature as low as 500 K at 630 GHz, and 980 K at 900 GHz. Noise temperatures of about 1000 K or less can be expected for frequencies above 1 THz in the future. NbN HEB mixers have been shown to have sufficient bandwidths for the anticipated applications such as future receiver frontends for THz astronomical observation from space. A receiver noise bandwidth of 5 GHz and conversion gain bandwidth of 3 GHz were measured by. The LO power required is typically 100 nW, which makes the NbN HEB mixers suitable for use with future solid state tunable THz sources. However, the LO power is not at such a low level that its operating point is affected by input thermal noise power. This paper describes the development of THz HEB mixers for the 1 THz to 2.5 THz frequency range. The HEBs employ NbN as the bolometric material. We present our first results from measurements with these mixers at frequencies of 0.6 THz to 0.75 THz, 1.56 THz, and 2.52 THz.
Categories:
HEB Mixers
Year:
1998
Session:
3
Full-text:
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Page Number(s):
105-114