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Title: Antenna-assisted subwavelength metal–InGaAs–metal structure for sensitive and direct photodetection of millimeter and terahertz waves
Authors: Tong, Jinchao
Qu, Yue
Suo, Fei
Zhou, Wei
Huang, Zhiming
Zhang, Dao Hua
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Tong, J., Qu, Y., Suo, F., Zhou, W., Huang, Z., & Zhang, D. H. (2019). Antenna-assisted subwavelength metal–InGaAs–metal structure for sensitive and direct photodetection of millimeter and terahertz waves. Photonics Research, 7(1), 89-97. doi:10.1364/PRJ.7.000089
Project: 2017-T1-002-117
Journal: Photonics Research
Abstract: 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.
ISSN: 2327-9125
DOI: 10.1364/PRJ.7.000089
Rights: © 2019 Chinese Laser Press. All rights reserved. This paper was published by OSA Publishing in Photonics Research and is made available with permission of Chinese Laser Press.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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