ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report on efficient coupling of THz radiation to a high-Tc superconducting 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 ≈3×105 K. We also discuss possibilities of significant improvement of the sensitivity. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.117808
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