Title :
Investigation of superconducting NbN hot-electron bolometers for terahertz direct detection
Author :
Jiaqiang Zhong ; Wei Miao ; Wen Zhang ; Sheng-cai Shi ; Pajot, F.
Author_Institution :
Purple Mountain Obs. (PMO), Nanjing, China
Abstract :
In this paper, we report on the terahertz (THz) direct detection performance of two superconducting niobium nitride (NbN) hot-electron bolometers (HEBs) of different micro-bridge sizes. At the optimum bias point, the two HEB devices show similar thermal conductance (~80nW/K). The measured responsivity coincides well with the electrical responsivity calculated from the measured current-voltage (IV) curves at different bath temperatures. The noise equivalent power (NEP) of the two HEB devices is found to be about 10-12W/√Hz.
Keywords :
bolometers; electric current measurement; hot carriers; niobium compounds; submillimetre wave detectors; submillimetre wave measurement; superconducting devices; terahertz wave detectors; thermal conductivity measurement; voltage measurement; HEB device; IV curve measurement; NEP; NbN; THz direct detection performance; current-voltage curve measurement; electrical responsivity measurement; microbridge size; noise equivalent power; superconducting hot-electron bolometer; terahertz direct detection performance; thermal conductance; Bolometers; Current measurement; Electrical resistance measurement; Extraterrestrial measurements; Noise; Temperature measurement; Thermal conductivity;
Conference_Titel :
General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI
Conference_Location :
Beijing
DOI :
10.1109/URSIGASS.2014.6930018
