PT Journal
AU Zhang, W
   Miao, W
   Yao, QJ
   Lin, ZH
   Shi, SC
   Gao, JR
   Goltsman, GN
TI Spectral response and noise temperature of a 2.5 THz spiral antenna coupled NbN HEB mixer
SO Phys. Procedia
JI Phys. Procedia
PY 2012
BP 334
EP 337
VL 36
DI 10.1016/j.phpro.2012.06.169
DE NbN HEB mixer
AB We 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 1180 K 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.
ER