Long-wave Infrared Computational Multispectral Metasurface and Spectral Reconstruction Method

We designed a computational multispectral metasurface based on photonic crystals. The study results show that in the 8-11.5\textmu m wavelength range, the 3×3 photonic crystal array structure exhibits an average transmittance correlation of 0.17, with peak transmittance values ranging from 62.5% to 89.1% and an average energy utilization rate of 32.65% and 49.37%. Additionally, to evaluate the spectral reconstruction performance of the transmission spectra under different photonic crystals, a spectral reconstruction deep learning network was constructed with the mean squared error is 1.292×10−3. This establishes a foundation for future integration on superlattice detectors, aimed at enhancing device integration, reducing system power consumption, and lowering costs.