Infrared absorber for ferroelectric detectors.

A thin-film, metal-dielectric coating is described that can be used as a nearly ideal IR absorber for ferroelectric and related IR detectors. This coating can provide an absorption of greater than 98% for IR wavelengths over a two-to-one spectral band. The theory and optical design are presented along with measured data for several experimental absorbers. The agreement between theory and experiment is excellent.