| Autor: |
Gousev, Yu. P., Semenov, A. D., Pechen, E. V., Varlashkin, A. V., Nebosis, R. S., Renk, K. F. |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 7/29/1996, Vol. 69 Issue 5, p691, 3p, 1 Diagram, 3 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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