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 novel 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.
@article{arxiv.2306.04388,
title = {Single-pixel p-graded-n junction spectrometers},
author = {Jingyi Wang and Beibei Pan and Zi Wang and Jiakai Zhang and Zhiqi Zhou and Lu Yao and Yanan Wu and Wuwei Ren and Jianyu Wang and Jingyi Yu and Baile Chen},
journal= {arXiv preprint arXiv:2306.04388},
year = {2023}
}