Silicon-based high sensitivity of room-temperature microwave and sub-terahertz detector

We demonstrated a Si-based photoelectric detector with silicon-on-insulator structure. The Si-based detector was successfully fabricated and showed broadband response from 20-40 GHz to 0.165-0.173 THz radiation at room temperature. It achieved a maximal responsivity of 49.3 kV W-1 and noise equivalent power (NEP) of 0.38 pW Hz -(1/2) at 20-40 GHz, and achieved a responsivity of 3.3 kV W-1 and NEP of 5.7 pW Hz(-1/2) at 0.165-0.173 THz; moreover, a short response time similar to 810 ns was realized for the detector. The simple structure, excellent performance and easy integration of the detectors, which provides an avenue to the optoelectronic integration of sensitive room-temperature terahertz focal-plane arrays. (C) 2019 The Japan Society of Applied Physics