Open AccessNoise temperature of a 4.3 THz HEB receiver
Author(s) -
P. Khosropanah,
W. M. Laauwen,
J. R. Gao,
M. Hajenius,
J. N. Hovenier,
Teun M. Klapwijk
Publication year - 2007
Publication title -
proceedings of spie, the international society for optical engineering/proceedings of spie
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.192
H-Index - 176
eISSN - 1996-756X
pISSN - 0277-786X
DOI - 10.1117/12.737332
Subject(s) - terahertz radiation , bolometer , noise temperature , noise (video) , local oscillator , superheterodyne receiver , heterodyne (poetry) , antenna (radio) , physics , optoelectronics , voltage , materials science , biasing , spiral antenna , optics , sensitivity (control systems) , temperature measurement , noise equivalent power , phase noise , electrical engineering , acoustics , photodetector , dipole antenna , microwave , electronic engineering , engineering , detector , artificial intelligence , image (mathematics) , computer science , quantum mechanics , coaxial antenna , responsivity
We have characterized a heterodyne receiver based on an NbN hot electron bolometer integrated with spiral antenna as mixer and an optically pumped FIR ring laser at 4.3 THz as local oscillator (LO). We succeeded in measuring the receiver output power, responding to the hot/cold load, as a function of bias voltage at optimum LO power. From the resulted receiver noise temperature versus the bias voltage, we found a DSB receiver noise temperature of 3500 K at a bath temperature of 4 K, which is a minimum average value. This is the highest sensitivity reported so far at frequencies above 4 THz.
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