PT Journal
AU Gousev, YP
   Semenov, AD
   Pechen, EV
   Varlashkin, AV
   Nebosis, RS
   Renk K. F
TI Coupling of terahertz radiation to a high-Т(с) superconducting hot electron bolometer mixer
JI Appl. Phys. Lett.,
PY 1996
BP 691
EP 693
VL 69
AB We report  on efficient coupling of THz radiation to a high-T(c) superconducting hot electron bolometer that is suitable for heterodyne detection. Our quasioptical system consisted of a planar self-complementary spiral antenna on a dielectric substrate clamped to an extended hyperhemispherical lens. The antenna was integrated into a co-planar line for broadband intermediate frequency matching. Measurements in the homodyne regime at a frequency of 2.5 THz showed a radiation pattern with a beam width of 1° and a coupling efficiency of 0.1. We measured, at an intermediate frequency of 1.5 GHz, an output noise temperature of'160 K and estimated for the device, operated in the heterodyne regime, a system noise temperature of 30 000 K. We also discuss possibilities of significant improvement of the sensitivity.
ER