Single-pixel p-graded-n junction spectrometers

Jingyi Wang, Beibei Pan, Zi Wang, Jiakai Zhang, Zhiqi Zhou, Lu Yao, Yanan Wu, Wuwei Ren, Jianyu Wang, Haiming Ji, Jingyi Yu () and Baile Chen ()
Additional contact information
Jingyi Wang: ShanghaiTech University
Beibei Pan: ShanghaiTech University
Zi Wang: ShanghaiTech University
Jiakai Zhang: ShanghaiTech University
Zhiqi Zhou: ShanghaiTech University
Lu Yao: ShanghaiTech University
Yanan Wu: ShanghaiTech University
Wuwei Ren: ShanghaiTech University
Jianyu Wang: ShanghaiTech University
Haiming Ji: University of Chinese Academy of Sciences
Jingyi Yu: ShanghaiTech University
Baile Chen: ShanghaiTech University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Ultra-compact spectrometers are becoming increasingly popular for their promising applications in biomedical analysis, environmental monitoring, and food safety. In this work, we report a single-pixel-photodetector spectrometer with a spectral range from 480 nm to 820 nm, based on the AlGaAs/GaAs p-graded-n junction with a voltage-tunable optical response. To reconstruct the optical spectrum, we propose a tailored method called Neural Spectral Fields (NSF) that leverages the unique wavelength and bias-dependent responsivity matrix. Our spectrometer achieves a high spectral wavelength accuracy of up to 0.30 nm and a spectral resolution of up to 10 nm. Additionally, we demonstrate the high spectral imaging performance of the device. The compatibility of our demonstration with the standard III-V process greatly accelerates the commercialization of miniaturized spectrometers.

Date: 2024
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DOI: 10.1038/s41467-024-46066-5

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