Investigation of superconducting NbN hot-electron bolometers for terahertz direct detection
General Assembly and Scientific Symposium（2014）
摘要
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.
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关键词
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
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