NDLI: Performance of the NbTiN hot electron bolometer mixer with AlN buffer layer at terahertz frequency range

Content Provider	IEEE Xplore Digital Library
Author	Loudkov, D. Tong, C.-Y.E. Blundell, R. Megerian, K.G. Stern, J.A.
Copyright Year	2002
Abstract	We present recent measurements of receiver noise temperature and intermediate frequency (IF) bandwidth in the frequency range 0.8-1.3 THz for waveguide NbTiN HEB mixers of various dimensions. These devices are fabricated from an NbTiN film deposited on crystalline quartz substrates with AlN buffer layer. The lengths of the mixer elements vary from 0.3 to 0.5 /spl mu/m and their widths vary from 3 to 10 /spl mu/m. Critical temperatures are typically at 8.5 K, and the measured normal state resistance of the devices is about 1000 ohms per square. All the device DC parameters demonstrate a high degree of uniformity. A double side band noise temperature at 0.8 THz as low as 550 K has been measured at an IF frequency of 1.8 GHz, with a conversion loss of around 14 dB. At an IF of 3 GHz, the noise temperature increases to 750 K. We have also made extensive measurements of the IF bandwidth as a function of bias voltages and currents. At the optimal low-noise operation point, a 3-dB IF bandwidth of 1.2 GHz is obtained for a wide variety of device dimensions and bath temperature.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	476
Ending Page	479
Page Count	4
File Size	124168
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrons Bolometers Buffer layers Noise measurement Bandwidth Frequency measurement Electrical resistance measurement Temperature distribution Crystallization Substrates waveguide terahertz receiver Hot electron bolometric mixer NbTiN superconducting film
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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