Antenna-assisted subwavelength metal–InGaAs–metal structure for sensitive and direct photodetection of millimeter and terahertz waves
Millimeter and terahertz wave photodetectors have a wide range of applications. However, the state-of-the-art techniques lag far behind the urgent demand due to the structure and performance limitations. Here, we report sensitive and direct millimeter and terahertz wave photodetection in compact InGaAs-based subwavelength ohmic metal–semiconductor–metal structures. The photoresponse originates from unidirectional transportation of nonequilibrium electrons induced by surface plasmon polaritons under irradiation. The detected quantum energies of electromagnetic waves are far below the bandgap of InGaAs, offering, to the best of our knowledge, a novel direct photoelectric conversion pathway for InGaAs beyond its bandgap limit. The achieved room temperature rise time and noise equivalent power of the detector are 45 μs and 20 pW·Hz?1/2, respectively, at the 0.0375 THz (8 mm) wave. The detected wavelength is tunable by mounting different coupling antennas. Room temperature terahertz imaging of macroscopic samples at around 0.166 THz is also demonstrated. This work opens an avenue for sensitive and large-area uncooled millimeter and terahertz focal planar arrays.
基金项目：Ministry of Education - Singapore (MOE)10.13039/501100001459 (RG177/17); Economic Development Board - Singapore (EDB)10.13039/501100001446 (NRF2013SAS-SRP001-019); Agency for Science, Technology and Research (A*STAR)10.13039/501100001348 (1720700038); China National Funds for Distinguished Young Scientists10.13039/501100005153 (61625505); Science and Technology Commission of Shanghai Municipality (STCSM)10.13039/501100003399 (16JC1403400).
Yue Qu：State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Fei Suo：School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
Wei Zhou：State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
Zhiming Huang：State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaKey Laboratory of Space Active Opto-electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, Chinae-mail: email@example.com
Dao Hua Zhang：School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singaporee-mail: EDHZHANG@ntu.edu.sg
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Jinchao Tong, Yue Qu, Fei Suo, Wei Zhou, Zhiming Huang, and Dao Hua Zhang, "Antenna-assisted subwavelength metal–InGaAs–metal structure for sensitive and direct photodetection of millimeter and terahertz waves," Photonics Research 7(1), 89-97 (2019)