ISSTT Proceedings

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Direct and Heterodyne Response of Quasi Optical Nb Hot-Electron Bolometer Mixers Designed for 2.5 Thz Radiation Detection

Authors:
W.F.M. Ganzevles, J.R. Gao, W.M. Laauwen, G. de Lange, T.M. Klapwijk, P.A.J. de Korte
Abstract:
We measure the direct response of a, Nb diffusion-cooled hot electron bolometer mixer m a frequency range between 0.5 THz and 3.5 THz. The mixer consists essentially of a twin slot antenna, a co-planar waveguide transmission line and a Nb superconducting bridge. It is designed for use in receivers with astronomical and atmospherical applications around 2.5 TI-1z. We calculate the impedance of the antenna, the transmission line and the bridge separately using models which are developed for frequencies below 1 THz and predict the direct response of the mixer. We demonstrate that these models can be applied to lunch higher frequencies. However, the measured central frequency is 10-15% lower than predicted. Using a far infrared (FIR) laser, the device can be fully pumped at 2.5 THz. A preliminary Y-factor measurement shows a corrected noise temperature of 4700 K.
Categories:
Hot Electron Bolometers
Year:
2000
Session:
1
Full-text:
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Page Number(s):
69-81