TY  - JOUR
AU  - Tong, C-Y E.
AU  - Trifonov, A.
AU  - Shurakov, A.
AU  - Blundell, R.
AU  - Gol’tsman, G.
PY  - 2015
DA  - 2015//
TI  - A microwave-operated hot-electron-bolometric power detector for terahertz radiation
T2  - IEEE Trans. Appl. Supercond.
JO  - IEEE Trans. Appl. Supercond.
SP  - 2300604 (1 to 4)
VL  - 25
IS  - 3
KW  - NbN HEB mixer
AB  - A new class of microwave-operated THz power detectors based on the NbN hot-electron-bolometer (HEB) mixer is proposed. The injected microwave signal ( 1 GHz) serves the dual purpose of pumping the HEB element and enabling the read-out of the internal state of the device. A cryogenic amplifier amplifies the reflected microwave signal from the device and a homodyne scheme recovers the effects of the incident THz radiation. Two modes of operation have been identified, depending on the level of incident radiation. For weak signals, we use a chopper to chop the incident radiation against a black body reference and a lock-in amplifier to perform synchronous detection of the homodyne readout. The voltage measured is proportional to the incident power, and we estimate an optical noise equivalent power of  5pW/ √Hz at 0.83 THz. At higher signal levels, the homodyne circuit recovers the stream of steady relaxation oscillation pulses from the HEB device. The frequency of these pulses is in the MHz frequency range and bears a linear relationship with the incident THz radiation over an input power range of  15 dB. A digital frequency counter is used to measure THz power. The applicable power range is between 1 nW and 1 μW.
SN  - 1558-2515
UR  - https://doi.org/10.1109/TASC.2014.2377670
DO  - 10.1109/TASC.2014.2377670
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1354), last updated on Thu, 13 May 2021 00:03:15 -0500
ID  - Tong_etal2015
ER  -