Patent ID: 9696632
Date: 2017-07-04
CPC Classifications: B82Y,C23C,G02B,G03F,G21K

Claim:
1. Mirror for the extreme ultraviolet (EUV) wavelength range having a reflectivity of greater than 40% for at least one angle of incidence of between 0° and 25°, comprising a substrate (S) and a layer arrangement, wherein the layer arrangement comprises at least one non-metallic individual layer (B, H, M), wherein the layer arrangement comprises at least one layer subsystem (P′) consisting of a periodic sequence of at least two periods (P) of individual layers, wherein the periods (P) comprise two individual layers composed of different materials for a high refractive index layer (H) and a low refractive index layer (L), wherein the materials of the two individual layers (L, H) of the at least one layer subsystem (P′) that form the periods (P) are either molybdenum and silicon or ruthenium and silicon, wherein the individual layers of the at least one layer subsystem (P′) are separated by at least one barrier layer (B) and the barrier layer (B) consists of a material which is selected from the group of materials: B wherein the non-metallic individual layer (B, H, M) has a doping with impurity atoms of between 10 ppb and 10%, which increases a number of free electrons in the non-metallic individual layer and provides the non-metallic individual layer (B, H, M) at least one of: