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Full characterization and analysis of a terahertz heterodyne receiver based on a NbN hot electron bolometer

Hajenius, M. and Baselmans, J. J. A. and Baryshev, A. and Gao, J. R. and Klapwijk, T. M. and Kooi, J. W. and Jellema, W. and Yang, Z. Q. (2006) Full characterization and analysis of a terahertz heterodyne receiver based on a NbN hot electron bolometer. Journal of Applied Physics, 100 (7). Art. No. 074507. ISSN 0021-8979. doi:10.1063/1.2354421.

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We present a complete experimental characterization of a quasioptical twin-slot antenna coupled small area (1.0×0.15 µm^2) NbN hot electron bolometer (HEB) mixer compatible with currently available solid state tunable local oscillator (LO) sources. The required LO power absorbed in the HEB is analyzed in detail and equals only 25 nW. Due to the small HEB volume and wide antenna bandwidth, an unwanted direct detection effect is observed which decreases the apparent sensitivity. Correcting for this effect results in a receiver noise temperature of 700 K at 1.46 THz. The intermediate frequency (IF) gain bandwidth is 2.3 GHz and the IF noise bandwidth is 4 GHz. The single channel receiver stability is limited to 0.2–0.3 s in a 50 MHz bandwidth.

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Kooi, J. W.0000-0002-6610-0384
Additional Information:©2006 American Institute of Physics (Received 24 November 2005; accepted 8 July 2006; published online 11 October 2006) We thank B. Voronov and G. Gol’tsman for providing us with the NbN films, JPL for making available the tunable solid state LO chain for our experiment, and the help of J. Kawamura thereby. The work is supported financially by the EU through RadioNet and INTAS program.
Subject Keywords:niobium compounds; submillimetre wave receivers; submillimetre wave antennas; bolometers; submillimetre wave mixers; slot antennas; oscillators; broadband antennas; superconducting microwave devices
Issue or Number:7
Record Number:CaltechAUTHORS:HAJjap06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6049
Deposited By: Archive Administrator
Deposited On:15 Nov 2006
Last Modified:08 Nov 2021 20:30

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