Coupling of terahertz radiation to a high‐Tcsuperconducting hot electron bolometer mixer
作者:
Yu. P. Gousev,
A. D. Semenov,
E. V. Pechen,
A. V. Varlashkin,
R. S. Nebosis,
K. F. Renk,
期刊:
Applied Physics Letters
(AIP Available online 1996)
卷期:
Volume 69,
issue 5
页码: 691-693
ISSN:0003-6951
年代: 1996
DOI:10.1063/1.117808
出版商: AIP
数据来源: AIP
摘要:
We report on efficient coupling of THz radiation to a high‐Tcsuperconducting hot electron bolometer that is suitable for heterodyne detection. Our quasi‐optical 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 ≊3×105K. We also discuss possibilities of significant improvement of the sensitivity. ©1996 American Institute of Physics.
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