Spectral Response and Noise Temperature of a 2.5 THz Spiral Antenna Coupled NbN HEB Mixer
- Zhang, W.
- Miao, W.
- Yao, Q.J.
- Lin, Z.H.
- Shi, S.C.
- Gao, J.R.
- Goltsman, G.N.
Publication date
December 2012
DOI Publisher
Published by Elsevier B.V. ISSN
1875-3892 Citation count (estimate)
5Abstract
AbstractWe report on a 2.5 THz spiral antenna coupled NbN hot electron bolometer (HEB) mixers, fabricated with in-situ process. The receiver noise temperature with lowest value of 1180K is in good agreement with calculated quantum efficiency factor as a function of bias voltage. In addition, the measured spectral response of the spiral antenna coupled NbN HEB mixer shows broad frequency coverage of 0.8-3 THz, and corrected response for optical losses, FTS, and coupling efficiency between antenna and bolometer falls with frequency due to diffraction-limited beam of lens/antenna combination
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