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Title: Hole array enhanced dual-band infrared photodetection
Authors: Suo, Fei
Tong, Jinchao
Chen, Xiren
Xu, Zhengji
Zhang, Dao Hua
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2021
Source: Suo, F., Tong, J., Chen, X., Xu, Z. & Zhang, D. H. (2021). Hole array enhanced dual-band infrared photodetection. Optics Express, 29(5), 6424-6433.
Project: SERC 1720700038 
SERC A1883c0002 
Journal: Optics Express 
Abstract: Photonic structures have been attracting more attention due to their ability to capture, concentrate and propagate optical energy. In this work, we propose a photon-trapping hole-array structure integrated in a nip InAsSb-GaSb heterostructure for the enhancement of the photoresponse in both near- and mid-infrared regions. The proposed symmetrical hole array can increase the photon lifetime inside the absorption layer and reduce reflection without polarization dependence. Significant enhancements in absorption and photoelectric conversion efficiency are demonstrated in dual bands for unpolarized incidence. The enhancement factors of responsivity at room temperature under zero-bias are 1.12 and 1.33 for the near- and mid-infrared, respectively, and they are increased to 1.71 and 1.79 when temperature drops to the thermoelectric cooling temperature of 220 K. Besides, such an integrated hole array also slightly improves working frequency bandwidth and response speed. This work provides a promising way for high-efficiency polarization-independent photoelectric conversion in different electromagnetic wave ranges.
ISSN: 1094-4087
DOI: 10.1364/OE.415987
Schools: School of Electrical and Electronic Engineering 
Rights: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for noncommercial purposes and appropriate attribution is maintained. All other rights are reserved.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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