A 665 GHz Waveguide Receiver Using a Tuned 0.5 μm2 Nb/AlOx/Nb SIS Tunnel Junction

Details A 665 GHz Waveguide Receiver Using a Tuned 0.5 μm2 Nb/AlOx/Nb SIS Tunnel Junction A 665 GHz Waveguide Receiver Using a Tuned 0.5 μm2 Nb/AlOx/Nb SIS Tunnel Junction

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996stt..conf...76k&link_type=abstract

Proceedings of the Seventh International Symposium on Space Terahertz Technology, held March 12-14, 1996, at the University of V

Physics

Optics

2

Scientific paper

We report recent results on a 580-740 GHz SIS heterodyne receiver employing a tuned 0.50μm2 Nb/AlOx/Nb SIS tunnel junction. The receiver has been successfully installed at the Caltech Submillimeter Observatory, Hawaii. Results of an untuned device in the same waveguide block were presented at the fifth International THz Conference. Since the mixer is meant to be operated near the supercondunting gap frequency of niobium (2Δ/h ≈ 690 GHz), special has been taken to minimize the absorption loss in the rf matching network. To this effect we propose the use of a RF matching network that constitutes a hybrid between the well known "end-loaded" stub and radial stub matching networks. We have measured uncorrected DSB receiver temperatures as low as 160K from 680- to 702 GHz, 200K at 725GHz and 120K from 585-640 GHz. The uncorrected mixer noise temperature at 702 GHz is about 125K, of which 62K can be directly contributed to the front end optics loss. Mixer conversion loss at 702 GHz is 7dB, of which ≈ 0.9dB is due to the absorption loss in the Nb film. This results in a corrected mixer noise temperature of 63K, ≈ 1.7 times the quantum noise limit.

Affiliated with

Also associated with

No associations

Rating

A 665 GHz Waveguide Receiver Using a Tuned 0.5 μm2 Nb/AlOx/Nb SIS Tunnel Junction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A 665 GHz Waveguide Receiver Using a Tuned 0.5 μm2 Nb/AlOx/Nb SIS Tunnel Junction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A 665 GHz Waveguide Receiver Using a Tuned 0.5 μm2 Nb/AlOx/Nb SIS Tunnel Junction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1618751