WIDE RANGE DETECTOR USING PARABOLIC CYLINDRICAL MIRROR FOR THz APPLICATIONS

Authors: Yasui, Takanari; Ohtsuka, Takeshi; Suzuki, Tetsu; Okajima, Shigeki; Nakayama, Kazuya; Tomioka, Mitsuru; Kamimura, Katsuhiro; Namekata, Takeo; Minamide, Hiroaki; Ito, Hiromasa

Source: International Journal of Infrared and Millimeter Waves, Volume 27, Number 2, February 2006 , pp. 199-210(12)

Publisher: Springer

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Abstract:

A new, wide-band, high-speed and high-sensitivity THz detector has been developed. The prototype detector consists of a parabolic cylindrical mirror, a long wire antenna and a Schottky barrier diode. Direct detection measurements have shown a stable sensitivity of 150 ± 50 V/W for 1-2 THz without any adjustments. The long wire antenna was fixed at the focus of parabolic cylindrical mirror then it has been realized less operation steps, easy coupling to the external THz signals and a dramatic enhancement in the practicality of this system. The optically polished mirror and frosted surface one showed comparable sensitivities, thus easy polishing and less cost mirror fabrication can be applied for this system. The radiation pattern showed a maximum radiation angle of approximately 23° with its dominant main lobe, which was attributed to the wire antenna character and confirmed good agreements with classical antenna theory.

Keywords: parabolic mirror; THz; detector; sensitivity; radiation pattern

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10762-006-9068-9

Publication date: 2006-02-01