Cai, GuiyiLi, YanhaoZhang, YaoJiang, XiongChen, YimuQu, GeyangZhang, XudongXiao, ShuminHan, JiecaiYu, ShaohuaKivshar, YuriSong, Qinghai2024-08-292024-08-291476-1122https://hdl.handle.net/1885/733716048Light scattered or radiated from a material carries valuable information on the said material. Such information can be uncovered by measuring the light field at different angles and frequencies. However, this technique typically requires a large optical apparatus, hampering the widespread use of angle-resolved spectroscopy beyond the lab. Here we demonstrate compact angle-resolved spectral imaging by combining a tunable metasurface-based spectrometer array and a metalens. With this approach, even with a miniaturized spectrometer footprint of only 4 × 4 μm2, we demonstrate a wavelength accuracy of 0.17 nm, spectral resolution of 0.4 nm and a linear dynamic range of 149 dB. Moreover, our spectrometer has a detection limit of 1.2 fJ, and can be patterned to an array for spectral imaging. Placing such a spectrometer array directly at the back focal plane of a metalens, we achieve an angular resolution of 4.88 × 10−3 rad. Our angle-resolved spectrometers empowered by metalenses can be employed towards enhancing advanced optical imaging and spectral analysis applications.This research was supported by National Key Research and Development Program of China (grant nos. 2022YFA1404700 and 2021YFA1400802), National Natural Science Foundation of China (grant nos. 12025402, 12334016, 62125501, 6233000076, 12261131500, 92250302 and 11934012), New Cornerstone Science Foundation through XPLORER PRIZE, Shenzhen Fundamental Research Project (grant nos. JCYJ20210324120402006, JCYJ20220818102218040 and GXWD20220817145518001) and Fundamental Research Funds for the Central Universities (grant no. 2022FRRK030004), Y.K. acknowledges support from the Australian Research Council (grant no. DP210101292).application/pdfen-AU© Nature Publishing Group202410.1038/s41563-023-01710-12024-04-28