[12a-B414-1~10] 3.9 Terahertz technologies

[12a-B414-8] Photovoltage Output from Gate Electrode of a Grating-Gate Plasmonic THz Detector

〇Takumi Negoro¹, Taku Saito¹, Masaya Suzuki¹, Tomotaka Hosotani¹, Tetsuya Suemitsu², Yuma Takida³, Hiromasa Ito³, Hiroaki Minamide³, Taiichi Otsuji¹, Akira Satou¹ (1.Tohoku Univ. RIEC, 2.Tohoku Univ. CIES, 3.RIKEN Advanced Photonics)

Keywords:THz detection, Plasmon, HEMT

We have developed grating-gate plasmonic THz detectors, which are promising as room-temperature-operating, sensitive, high-speed THz detectors. In a conventional way, the photovoltage generated in a detector channel is output from the drain electrode. In this case, the photovoltage is proportional to the channel length only and is independent of the channel width, resulting in the output signal not proportional to the active area size. In this study, we theoretically show that the output is expected to be proportional to the active area size in case where the photocurrent is extracted from the gate electrode as a displacement current, leading to the greater output enhancement. Also, we experimentally show that the gate electrode of a grating-gate plasmonic THz detector works as an output port.