%0 Journal Article
%T Parylene anti-reflection coating of a quasi-optical hot-electron-bolometric mixer at terahertz frequencies
%A Hübers, H-W
%A Schubert, J.
%A Krabbe, A.
%A Birk, M.
%A Wagner, G.
%A Semenov, A.
%A Gol’tsman, G.
%A Voronov, B.
%A Gershenzon, E.
%J Infrared Physics & Technology
%D 2001
%V 42
%N 1
%@ 1350-4495
%F Huebers_etal2001
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1548), last updated on Mon, 24 May 2021 14:16:35 -0500
%X Parylene C was investigated as anti-reflection coating for silicon at terahertz frequencies. Measurements with a Fourier-transform spectrometer show that the transmittance of pure silicon can be improved by about 30% when applying a layer of Parylene C with a quarter wavelength optical thickness. The 10% bandwidth of this coating extends from 1.5 to 3 THz for a center frequency of 2.3–2.5 THz, where the transmittance is constant. Heterodyne measurements demonstrate that the noise temperature of a hot-electron-bolometric mixer can be reduced significantly by coating the silicon lens of the hybrid antenna with a quarter wavelength Parylene C layer. Compared to the same mixer with an uncoated lens the improvement is about 30% at a frequency of 2.5 THz.
%K NbN HEB mixers
%K anti-reflection coating
%R 10.1016/S1350-4495(00)00057-8
%U https://linkinghub.elsevier.com/retrieve/pii/S1350449500000578
%U https://doi.org/10.1016/S1350-4495(00)00057-8
%P 41-47