Gousev, Yu P. and Semenov, A. D. and Nebosis, R. S. and Pechen, E. V. and Varlashkin, A. V. and Renk, Karl F. (1996) Broad-band coupling of THz radiation to an YBa2Cu3O7-delta hot-electron bolometer mixer. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 9 (9). pp. 779-787. ISSN 0953-2048
Full text not available from this repository.Abstract
We report on broad-band coupling of THz radiation to an YBa2Cu3O7-delta superconducting hot-electron bolometer. The bolometer-a micro-bridge of an YBa2Cu3O7-delta film with a PrBa2Cu3O7-delta, protection layer-was built in a hybrid quasioptical antenna system consisting of a planar self-complementary spiral antenna on a dielectric substrate and an extended hyperhemispherical lens. The planar antenna was integrated into a coplanar transmission line for broad-band intermediate-frequency matching. Measurements performed in the direct detection regime between 2.5 THz and 4.2 THz delivered a system coupling efficiency for the radiation in the fundamental Gaussian mode of about 0.1 and a beam width of the radiation pattern of less than one degree. The pattern was consistent with the far-field radiation pattern that we calculated with a ray-tracing technique. At an intermediate frequency of 1.5 GHz we measured an output noise temperature of approximate to 160 K for the bolometer driven in the resistive state by both de and THz current and estimated, for the heterodyne regime, a system noise temperature of approximate to 3 x 10(5) K. We studied the effect of a protection layer on the rate of phonon escape from the micro-bridge and, thus, on the output frequency bandwidth of the device. We discuss possibilities of a significant improvement of the device performance.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SUPERCONDUCTING FILMS; STRATOSPHERIC OH; THERMAL PHONONS; MILLIMETER-WAVE; ANTENNAS; SUBMILLIMETER; PHOTORESPONSE; RECEIVERS; NOISE; MM |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Karl F. Renk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Jun 2023 05:59 |
| Last Modified: | 29 Jun 2023 05:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/51530 |
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