Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 30, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/aa621b
Keywords
terahertz; direct detector; microwave biasing; superconducting hot electron bolometer; noise equivalent power
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Funding
- National Basic Research Program of China ('973' Program) [2014CB339800]
- National Natural Science Foundation of China [61521001, 11173015, 11227904]
- Fundamental Research Funds for the Central Universities
- Jiangsu Key Laboratory of Advanced Techniques for Manipulating Electromagnetic Waves
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Terahertz (THz) direct detectors based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) and biased by a simple microwave (MW) source have been studied. The frequency and power of the MW are selected by measuring the MW responses of the currentvoltage (I-V) curves and resistance-temperature (R-T) curves of the NbN HEBs. The non-uniform absorption theory is used to explain the current jumps in the I-V curves and the resistance jumps in the R-T curves. Compared to the thermal biasing, the MW biasing method can improve the sensitivity, make the readout system much easier and consumes less liquid helium, which is important for long lasting experiments. The noise equivalent power (NEP) of 1.6 pW Hz(-1/2) and the response time of 86 ps are obtained for the detectors working at 4.2 K and 0.65 THz.
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