Red omnidirectional structural color made from metal and dielectric layers

Abstract

A multilayer stack displaying a red omnidirectional structural color. The multilayer stack includes a core layer, a semiconductor layer extending across the core layer, and a dielectric layer extending across the semiconductor layer. The semiconductor layer absorbs more than 70% of incident white light that has a wavelength less than 550 nanometers (nm). In addition, the dielectric layer in combination with the core layer reflects more than 70% of the incident white light with a wavelength greater than 550 nm. In combination, the core layer, semiconductor layer and dielectric layer form an omnidirectional reflector that reflects a narrow band of electromagnetic radiation with a center wavelength between 550-700 nm, has a width of less than 200 nm wide and a color shift of less than 100 nm when the reflector is viewed from angles between 0 and 45 degrees.

Dependencies are inferred from the claim text.