近日，中国科学院长春光学精密机械与物理研究所的李炜及其研究小组与新加坡国立大学的Cheng-Wei Qiu等人合作并取得一项新进展。经过不懈努力，他们研制出色散辅助的高维光电探测器。相关研究成果已于2024年5月15日在国际权威学术期刊《自然》上发表。

该研究团队证实，具有空间和频率色散的简单薄膜界面能够在波矢量域中精准投射和定制偏振与频谱响应。这种技术能将高维光信息编码至单次成像中，并通过深度残差网络高效解码。据研究人员所述，该方法能够通过单一设备和单次测量，在宽带频谱上实现对任意混合全斯托克斯偏振态光的全面表征，其性能与最先进的单一用途小型化偏光计或光谱仪相媲美，甚至更胜一筹。此外，这种研究方法可轻松整合至现有成像平台，实现无需比对的改进，为超紧凑、高维光探测和成像领域开辟了新的发展方向。

据悉，光的强度、偏振和波长是光的固有特性。用任意混合的偏振和光谱信息来表征光是一个非常重要的问题。尽管在偏振计和光谱仪的设计上付出了大量的努力，但同时产生光场的强度、偏振和光谱的高维特征是具有挑战性的，并且通常需要在空间或时间域中对偏振和/或波长敏感元件进行复杂的集成。

附：英文原文

Title: Dispersion-assisted high-dimensional photodetector

Author: Fan, Yandong, Huang, Weian, Zhu, Fei, Liu, Xingsi, Jin, Chunqi, Guo, Chenzi, An, Yang, Kivshar, Yuri, Qiu, Cheng-Wei, Li, Wei

Issue&Volume: 2024-05-15

Abstract: Intensity, polarization and wavelength are intrinsic characteristics of light. Characterizing light with arbitrarily mixed information on polarization and spectrum is in high demand. Despite the extensive efforts in the design of polarimeters and spectrometers, concurrently yielding high-dimensional signatures of intensity, polarization and spectrum of the light fields is challenging and typically requires complicated integration of polarization- and/or wavelength-sensitive elements in the space or time domains. Here we demonstrate that simple thin-film interfaces with spatial and frequency dispersion can project and tailor polarization and spectrum responses in the wavevector domain. By this means, high-dimensional light information can be encoded into single-shot imaging and deciphered with the assistance of a deep residual network. To the best of our knowledge, our work not only enables full characterization of light with arbitrarily mixed full-Stokes polarization states across a broadband spectrum with a single device and a single measurement but also presents comparable, if not better, performance than state-of-the-art single-purpose miniaturized polarimeters or spectrometers. Our approach can be readily used as an alignment-free retrofit for the existing imaging platforms, opening up new paths to ultra-compact and high-dimensional photodetection and imaging.

DOI: 10.1038/s41586-024-07398-w

Source: https://www.nature.com/articles/s41586-024-07398-w