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Low-noise 1 THz niobium superconducting tunnel junction mixer with a normal metal tuning circuit

Bin, M. and Gaidis, M. C. and Zmuidzinas, J. and Phillips, T. G. and LeDuc, H. G. (1996) Low-noise 1 THz niobium superconducting tunnel junction mixer with a normal metal tuning circuit. Applied Physics Letters, 68 (12). pp. 1714-1716. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:BINapl96

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Abstract

We describe a 1 THz quasioptical SIS mixer which uses a twin-slot antenna, an antireflection-coated silicon hyperhemispherical lens, Nb/Al-oxide/Nb tunnel junctions, and an aluminum normal-metal tuning circuit in a two-junction configuration. Since the mixer operates substantially above the gap frequency of niobium (nu >~ 2 Delta/h ~ 700 GHz), a normal metal is used in the tuning circuit in place of niobium to reduce the Ohmic loss. The frequency response of the device was measured using a Fourier transform spectrometer and agrees reasonably well with the theoretical prediction. At 1042 GHz, the uncorrected double-sideband receiver noise temperature is 840 K when the physical temperature of the mixer is 2.5 K. This is the first SIS mixer which outperforms GaAs Schottky diode mixers by a large margin at 1 THz.


Item Type:Article
Additional Information:Copyright © 2006 American Institute of Physics. Received 6 November 1995; accepted 11 January 1996. We thank Paul Stockman and Geoff Blake for their assistance with the far-IR laser measurements, and Jacob Kooi for help with the 800 GHz measurements. This work was supported by NASA Grants NAG2-744 and NAGW-107, the NASA/JPL Center for Space Microelectronics Technology,and a NSF Presidential Young Investigator grant to J.Zmuidzinas.
Subject Keywords:ALUMINIUM OXIDES; HETERODYNE RECEIVERS; INFRARED SPECTRA; MICROWAVE SPECTRA; MIXERS; NIOBIUM; NOISE; SUPERCONDUCTING DEVICES; TUNNEL DIODES
Record Number:CaltechAUTHORS:BINapl96
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BINapl96
Alternative URL:http://dx.doi.org/10.1063/1.115915
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3680
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:27 Jun 2006
Last Modified:26 Dec 2012 08:55

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