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Title: Elliptical cylinder metallic array for enhancing room-temperature midwave infrared photodetection
Authors: Tong, Jinchao
Suo, Fei
Zhang, Dao Hua
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Tong, J., Suo, F. & Zhang, D. H. (2019). Elliptical cylinder metallic array for enhancing room-temperature midwave infrared photodetection. Journal of Physics D: Applied Physics, 52, 475105-.
Project: SERC 1720700038
SERC A1883c0002
Journal: Journal of Physics D: Applied Physics
Abstract: Metasurface, from periodical and artificial structures of 'meta-atoms' constructed by subwavelength-sized metallic resonators, has been incorporated with optoelectronic devices to realize improved and multifunctional performance. Here, we report a fourfold rotationally-symmetric elliptical cylinder metasurface for enhancing photodetection in the midwave infrared (2–5 µm) range. This metasurface has the capability to confine light within a small volume and has polarization-independence property. An enhanced photodetector consisting of this metasurface and an InAsSb-based heterojunction photodiode is fabricated and evaluated in detail. Polarization-independent improvement for performance is achieved. A fourfold specific detectivity (D*) improvement (to 3.3  ×  109 Jones) compared to that of a reference photodiode is achieved for room-temperature operation. Electrically controlled enhancement for the enhanced device is observed with a maximum enhancement factor of six (600%) for photocurrent (or responsivity). The enhanced photodiode has response speed similar to that of the reference.
ISSN: 0022-3727
DOI: 10.1088/1361-6463/ab3b72
Rights: © 2019 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at
Fulltext Permission: open
Fulltext Availability: With Fulltext
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