Patent ID: 8928980
Filing Date: 2015-01-06
Classification: G03F

Abstract:
1. A micromirror arrangement, comprising: at least one micromirror having a reflective surface formed at a mirror substrate, and a reflective coating formed at the mirror substrate within the reflective surface, wherein the reflective coating has at least two layer subsystems, wherein the first layer subsystem has layers composed of a periodic sequence of alternate high and low refractive index layers composed of nonmetallic materials and is optimized with regard to reflectivity in respect of a used wavelength of used light for the micromirror arrangement, wherein the second layer subsystem is optimized with regard to reflectivity in respect of a measurement wavelength of measurement light for the micromirror arrangement, wherein the measurement wavelength deviates from the used wavelength by at least 50 nm, and wherein an incidence angle of the used light on the reflection surface deviates from an incidence angle of the measurement light on the reflection surface by at least 15°.