Grayscale-to-Color: Scalable Fabrication of Custom Multispectral Filter Arrays
Multispectral imaging captures spatial and spectral information beyond our vision. To achieve low-costand compact designs, multispectral filter arrays based on thin-film optical filters are manufactured atopimage sensors. Each imaging application requires a different set of spectral bands, however, everyspectral band requires a separate patterning step, including multiple material combinations. Hence, withmore bands, the more challenging and expensive the process becomes. We introduce a single-patterning-step process capable of producing high efficiency multispectral filter arrays with an arbitrarynumber of spectral bands. The versatile framework is cost-effective, scalable, simple to implement andcould be key enabling step towards widespread industrial adoption of multispectral image sensors.