GaSb-based mid-wave computational multispectral infrared detectors based on photonic crystal plates

The mid-wave multispectral detector combines the traditional spectrometer and infrared detector technologies to provide image information and spectral information at the same time, which has an important role in both civil and military fields. To solve the working band limitation and low energy utilization, this paper presents an integrated superlattice mid-wave multispectral hypersurface detector that can be used for computational multispectroscopy for the first time, which consists of photonic crystal (PC) plates of GaSb material, and uses PC microstructures to modulate the incident spectra, which can be used to reconstruct incident signals with computational multispectroscopy methods. In this paper, the finite difference time domain method (FDTD) is used to simulate the structural parameters of different PCs, and finally calculate the correlation coefficients of the transmission spectra of the different structures as well as the energy utilization rate. The simulation results show that the optimized structures have unique response curves and rich spectral features, with the average value of Pearson correlation coefficients (PCCs) < 0.3 and energy utilization >50%. It can be utilized in various fields, including astronomical remote sensing, medical diagnostics, and military reconnaissance.