Bilayer metasurface-enabled high sensitivity near-infrared computational spectrometer

Computational spectrometer based on spectral encoding directly captures the “fingerprint” of an object. However, the small effective detection area of conventional encoders leads to reduced sensitivity, limiting their practical applications. In this work, we propose a high-sensitivity near-infrared miniaturized spectrometer based on bilayer-metasurface, with a size of only 21 × 21 μm, and has potential to be integrated with CMOS chips to achieve spectral imaging. The sensitivity is about 60 % higher than that of conventional spectrometer, and the spectral reconstruction fidelity reaches 93.5 %. Our work provides an effective strategy for application in next generation of machine vision tasks for artificial intelligence.