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A Broad-Band THz Radiation Detector Using a Nb-Based Superconducting Tunnel Junction
- Source :
- IEEE Transactions on Appiled Superconductivity. 15:591-594
- Publication Year :
- 2005
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2005.
-
Abstract
- We have proposed and been developing a new broad-band terahertz (THz) radiation detector using a Nb-based superconducting tunnel junction (STJ). The STJ's were fabricated on LiNbO/sub 3/ and LiTaO/sub 3/ mono-crystal substrates. We radiated monochromatic THz pulses in the range 1-2 THz with the pulse repetition rate of 49 Hz, and successfully detected the corresponding periodic signals via a charge-sensitive preamplifier. The current signal obtained by the derivative of the output signal gave the time response of about 15-20 microseconds. The frequency response was compared with that of a conventional pyro-electric sensor. We found their frequency response showed the similar shape in frequency, demonstrating the flat response of the STJ detector in 1-2 THz. These results show that the detector can be used as a broad-band THz and far-infrared radiation detector above the frequency corresponding to the energy gap of the superconductor used for the base electrode.
Details
- ISSN :
- 10518223
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Appiled Superconductivity
- Accession number :
- edsair.doi...........4d64a49a67fddfa644e22ac9ae08c63c