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Twin-Slot Antenna Coupled Nb Hot Electron Bolometer Mixers at 1 THz and 2.5 THz

Authors:
W. F. M. Ganzevles, J. R. Gao, D. Wilms Floet, G. de Lange, A. K. van Langen, L. R. Swart, T. M. Klapwijk, P. A. J. de Korte
Abstract:
We have designed quasi-optically coupled Nb diffusion-cooled Hot Electron Bolometer Mixers (DC HEBMs) using a twin-slot antenna and Co-Planar Waveguide (CPW) transmission lines for 1.0 and 2.5 THz. The devices have been realized using two-step e-beam lithography and deep UV lithography. DC measurements give a critical temperature of the bridge of 6.1 K and a critical current density of 7 x 10 10Am-² . Typical normal state values for Rsquare are in the order of 30[Omega]. At 1 THz, we obtain, in contrast to results at 2.5 THz, excellent agreement between design and the response as measured in a. Fourier Transform Spectrometer. For the 2.5 THz devices the peak response is shifted to 1.5 THz, similar to results reported in literature. Heterodyne measurements on a 1 THz mixer have shown a corrected receiver noise temperature TN,corr of 3600 K at Tbath -= 3.3K. The Y-factor measurements at different IF suggest an IF bandwidth of at least 1.7 GHz.
Categories:
HEB Mixers
Year:
1999
Session:
5
Full-text:
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Page Number(s):
247-260