Single-Pixel Reconstructive Mid-Infrared Micro-Spectrometer


Miniaturized spectrometers in the mid-infrared (MIR) are critical in developing next-generation portable electronics for advanced sensing and analysis. The bulky gratings or detector/filter arrays in conventional micro-spectrometers set a physical limitation to their miniaturization. In this work, we demonstrate a single-pixel MIR micro-spectrometer that reconstructs the sample transmission spectrum by a spectrally dispersed light source instead of spatially grated light beams. The spectrally tunable MIR light source is realized based on the thermal emissivity engineered via the metal-insulator phase transition of vanadium dioxide (VO2). We validate the performance by showing that the transmission spectrum of a magnesium fluoride (MgF2) sample can be computationally reconstructed from sensor responses at varied light source temperatures. With potentially minimum footprint due to the array-free design, our work opens the possibility where compact MIR spectrometers are integrated into portable electronic systems for versatile applications.

Kaichen Dong
Jiachen Li
Tiancheng Zhang
Fangda Gu
Yuhang Cai
Jie Yao
Junqiao Wu
Publication date: 
April 17, 2023
Publication type: 
Journal Article
Dong, K., Li, J., Zhang, T., Gu, F., Cai, Y., Gupta, N., ... & Wu, J. (2023). Single-pixel reconstructive mid-infrared micro-spectrometer. Optics Express, 31(9), 14367-14376.