ISSTT Proceedings

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Microstripline-Coupled Quasi-Optical Niobium Hot Electron Bolometer Mixers around 2.5 THz

Authors:
W.F.M. Ganzevles, J.R. Gao, P. Yagoubov, T.M. Klapwijk, P.A.J. de Korte
Abstract:
For the first time, the measured direct and heterodyne response of a hot electron bolometer mixer (HEBM) at 2.5 THz applying a microstripline coupling circuit is reported. A new fabrication process for quasi-optically coupled HEBMs essentially consisting of a twin slot antenna, microstripline transformer and Nb microbridge has been developed. In a Fourier transform spectrometer, the frequency response of the device is measured. We find a peak response at a frequency of 2.0 THz and the bandwidth equals 1.5 THz. The peak frequency is about 20% lower than predicted by a model based on coupling the impedance of the constituting elements. By applying 2.5 THz RF radiation from a FIR laser, the mixer can be fully pumped as is suggested by the current-voltage curves. Using a chopped Y-factor technique, an uncorrected noise temperature TN,rec of 4200 K has been measured.
Categories:
Hot Electron Bolometers
Year:
2000
Session:
1
Full-text:
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Page Number(s):
60-68