The Advantages of Dual-Layer Broadband Filter Spectrometers in Improving Ill-Conditioned Spectrum Reconstruction Processes

We propose a design scheme of dual-layer broadband filter spectrometers, and analyze the advantages of this dual-layer filter structure in improving the ill-conditioned spectrum reconstruction processes of micro-spectrometers. Quantum dot filters and silicon film filters are stacked vertically to form the dual-layer filter array. The results show that in the case of different scales of filter arrays, the dual-layer filter structure can provide a less ill-conditioned spectral description matrix than the monolayer filter structure. This usually means that the spectrometers based on this dual-layer structure can have better spectrum reconstruction performance and noise resistance.