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Thin-film optical filters can nowadays be integrated onto pixels ofcommercial image sensors used for spectral imaging. A drawback of having morefilters on an image sensor is a loss in spatial resolution which could beregained by using smaller pixels. However, this work shows that miniaturizationcauses a reduction in transmittance and requires a trade-off between pixel sizeand filter bandwidth. This is caused by diffraction and the reduced number ofreflections in the filter. Analytical wave and ray optics models are developedand used for fast transmittance prediction and this is validated using acommercial spectral sensor and numerical simulations. The identified trade-offis an intrinsic limitation of pixel-integrated thin-film filter technology andthe developed models will be useful tools for exploring new hardware andcomputational solutions.

Pixel-integrated thin-film filter simulation and scaling trade-offs