Patent ID: 9442383
Filing Date: 2016-09-13
CPC Classification: B82Y,G02B,G03F,G21K

Claim Text:
1. A mirror arrangement for extreme ultraviolet (EUV) radiation comprising a multiplicity of mirror elements which are arranged alongside one another and jointly form a mirror surface of the mirror arrangement, wherein each mirror element comprises: a substrate, a multilayer arrangement applied on the substrate and having a reflective effect with respect to the EUV radiation, said multilayer arrangement comprising: for each active layer, a respective electrode arrangement configured to generate an electric field acting on the active layer, wherein the multilayer arrangement has a first layer group arranged between the radiation entrance surface and the active layer and having a first number N1 of layer pairs, and a second layer group arranged between the active layer and the substrate and having a second number N2 of layer pairs, wherein the numbers N1 and N2 of layer pairs of the first layer group and of the second layer group are configured such that, for at least one angle of incidence of the radiation impinging on the radiation entrance surface, the first layer group transmits a portion of the incident radiation through the active layer to the second layer group and the radiation reflected by the multilayer arrangement contains a first portion reflected by the first layer group and a second portion reflected by the second layer group.