Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 1, Issue 2, Pages 390-394Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2011.2161050
Keywords
Terahertz (THz) detectors; microbolometers; spiral antenna; superconductor; YBa2Cu3O7 (YBCO)
Funding
- Swedish Research Council (VR)
- Swedish National Space Board
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A high sensitivity broadband terahertz direct detector based on YBa2Cu3O7 high-Tc superconductor microbolometers is presented. At 77 K, the responsivity of the spiral antenna-integrated microbolometers (1.5 mu m x 1.5 mu m) is 190 V/W, referenced to the input of the silicon substrate lens, across the frequency range of 330 GHz-1.63 THz in a single device. The response time is approximately 300 ps. Using a room temperature readout, we measure an optical noise equivalent power (NEP) of 20 pW/Hz(0.5) (readout noise limited) for modulation frequencies ranging from 500 Hz to 100 kHz.
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