Extended short-wavelength infrared spectrometer based on a single n-graded-p junction

Ultra-compact spectrometers have attracted significant attention for their potential applications in portable systems for biomedical analysis, environmental monitoring, spectral analysis, and astronomical observation. In this work, we propose a miniaturized InGaAs-based extended short-wave infrared (eSWIR) spectrometer based on a single n-graded-p junction with voltage-tunable optical response characteristics in the range from 1600 to 2100 nm. We combine this unique optical characteristic with a regression algorithm to realize the reconstruction of an unknown spectrum. The spectrometer achieves a high responsivity of 0.73 A/W at 1650 nm, and a low dark current density of 3.91×10 −5 A/ cm 2 at 200 K, corresponding to a calculated detectivity of 1.69×10 11 cm · Hz 1/2 /W. Such spectrometers compatible with standard III–V processes can offer a pathway to greatly promote the development of miniaturized spectrometers.

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Publication Details

Journal
Photonics Research
Published
2025-09-25
DOI
https://doi.org/10.1364/prj.570193
Citations
1
Primary Topic
Photonic and Optical Devices
Type
article
Field-Weighted Citation Impact
0.73
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Extended short-wavelength infrared spectrometer based on a single n-graded-p junction

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Extended short-wavelength infrared spectrometer based on a single n-graded-p junction

Zhen Deng, Chunhua Du, Yang Jiang, Leran Zhao, J. F. Yue, Xiaolong Chen, Hong Chen, Jinyu Zhang, Wenxin Wang, Haiqiang Jia, Hongyang Wang, Zhongshan Zhang, Fanlong Meng, Renjie Wen, Le Qin
article en
1 citations

Abstract

Ultra-compact spectrometers have attracted significant attention for their potential applications in portable systems for biomedical analysis, environmental monitoring, spectral analysis, and astronomical observation. In this work, we propose a miniaturized InGaAs-based extended short-wave infrared (eSWIR) spectrometer based on a single n-graded-p junction with voltage-tunable optical response characteristics in the range from 1600 to 2100 nm. We combine this unique optical characteristic with a regression algorithm to realize the reconstruction of an unknown spectrum. The spectrometer achieves a high responsivity of 0.73 A/W at 1650 nm, and a low dark current density of 3.91×10 −5 A/ cm 2 at 200 K, corresponding to a calculated detectivity of 1.69×10 11 cm · Hz 1/2 /W. Such spectrometers compatible with standard III–V processes can offer a pathway to greatly promote the development of miniaturized spectrometers.

Photonics ResearchVol. 14(1)
Chinese Academy of Sciences (CN), Southern University of Science and Technology (CN), University of Chinese Academy of Sciences (CN)
Openalex Percentile: Top 23%
Photonic and Optical Devices
0.73
DOISourceOpenAlex
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