Superconductive hot-electron mixers for terahertz heterodyne receiver applications

Details Superconductive hot-electron mixers for terahertz heterodyne receiver applications Superconductive hot-electron mixers for terahertz heterodyne receiver applications

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3357...14m&link_type=abstract

Proc. SPIE Vol. 3357, p. 14-21, Advanced Technology MMW, Radio, and Terahertz Telescopes, Thomas G. Phillips; Ed.

Physics

1

Scientific paper

We report on the development of quasioptical Nb hot-electron bolometer mixers for heterodyne receivers operating at 1 THz 3 THz. The devices have submicron in-plane sizes, thus exploiting diffusion as the electron cooling mechanism. Quasioptical mixer circuits have been developed with planar double-dipole or twin-slot antennas. The measured (DSB) receiver noise temperatures are 1670 K at 1.1 THz, with an estimated mixer noise temperature of approximately equals 1060 K, and 2750 K at 2.5 THz, with an estimated mixer noise temperature of approximately equals 900 K. The IF bandwidth is found to scale as the length-squared, and bandwidths as high as 8 GHz have been measured. These results demonstrate the low-noise, broadband operation of the diffusion-cooled bolometer mixer over a wide range of far-infrared wavelengths.

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