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Abstract
We characterize superconducting antenna-coupled NbN hot-electron bolometer (HEB) for direct detection of THz radiation operating at a temperature of 9.0 K. At signal frequency of 2.5 THz, the measured value of the optical noise equivalent power is 2.0×10-13 W-Hz-0.5. The estimated value of the energy resolution is about 1.5 aJ. This value was confirmed in the experiment with pulsed 1.55-μm laser employed as a radiation source. The directly measured detector energy resolution is 2 aJ. The obtained risetime of pulses from the detector is 130 ps. This value was determined by the properties of the RF line. These characteristics make our detector a device-of-choice for a number of practical applications associated with detection of short THz pulses.
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Details
1 Physics Department, Moscow State Pedagogical University, 29 Malaya Pirogovskaya St., Moscow, 119992, Russia
2 Physics Department, Moscow State Pedagogical University, 29 Malaya Pirogovskaya St., Moscow, 119992, Russia; Moscow Institute of Electronics and Mathematics, National Research University Higher School of Economics, 34 Tallinskaja St., Moscow, 123458, Russia