Multilayered aluminum plasmonic metasurfaces for ultraviolet bandpass filtering

A multilayered aluminum-based metasurface is proposed toward realization of compact bandpass transmission filters for the ultraviolet spectral region. A systematic numerical study is presented that can assist in precisely tailoring the filter characteristics. The filter performance characteristics are benchmarked against previously reported filters. The proposed structures are CMOS process compatible and are suitable as replacements of bulky Wood's filters; consequently, they are a promising step toward cost-effective UV photodetectors and multispectral imagers.