▎ 摘　　要

We report a tunable bandpass mid-infrared filter with microstructure and graphene, and the transmission peaks can be tuned from 4.5638 mu m to 4.5461 mu m when the graphene's Fermi level increases from 0.2 eV to 1.0 eV. This bandpass mid-infrared filter is originated from the guided-mode resonance (GMR) effect, and the tunable mechanism is mainly attributed to the change of the refractive index of the graphene. This tunable mid-infrared filter can be applied in non-dispersive infrared analyzer.