Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 4, Issue 6, Pages 749-752Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2014.2352035
Keywords
Imaging; passive; submillimeter (submm); terahertz (THz); 1/f-noise; HEMT; InP
Funding
- U.S. Defense Advanced Research Projects Agency (DARPA) under the Terahertz Electronics program
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We combine newly developed InP HEMT amplifiers operating at 670 GHz with a zero-bias diode (ZBD) in order to investigate limits on passive imaging performance possible with fully uncooled, direct-detection technology. Noise-equivalent temperature difference (NETD) values under 2 K are found for reference conditions (30 Hz modulation). However, noise spectra continue to fall approximately as 1/f out to knee frequencies of several hundred hertz (Hz) and spectral densities of similar to 0.12 K/Hz(1/2) for the current, somewhat gain-starved, amplifiers. The amplifier alone contributes 0.043 K/Hz(1/2). These results indicate that modest-sized, rapidly scanned arrays should provide real-time, passive imaging-desired for standoff security screening and other applications-with the same image quality as cryogenic bolometer arrays.
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