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24 September 2012 Optimized sensitivity and beam pattern of a twin-slot antenna coupled NbN HEB mixer at 1.6THz
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We report on a twin-slot antenna coupled superconducting NbN hot electron bolometer (HEB) mixer designed for 1.6 THz. Terahertz (THz) radiation is quasi-optically coupled to the HEB with an uncoated elliptical Si lens. Measured DSB receiver noise temperatures are 1500 K at 0.85 THz, 1200 K at 1.27 THz, 1100 K at 1.31 THz, 1100 K at 1.4 THz, and 1000 K at 1.63 THz. This value at 1.63 THz is reduced to 750 K when the hot/cold loads in vacuum are used. The frequency dependence of the noise temperature is consistent with the measured FTS spectral response. The measured farfield beam patterns of the lens/antenna combination show nearly collimated beams with the side lobes below -16dB by adding a 40 μm extension to a standard Si elliptical lens design, which is understood by considering a slightly lower dielectric constant of Si (εSi) of 11.4 instead of 11.7. The good performance of such NbN HEB mixers makes it suitable for future high-resolution spectroscopic astronomical applications.
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W. Zhang, D. Hayton, J. R. Gao, M. Hajenius, W. Miao, D. Liu, T. M. Klapwijk, and S. C. Shi "Optimized sensitivity and beam pattern of a twin-slot antenna coupled NbN HEB mixer at 1.6THz", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84522H (24 September 2012);

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