Patent ID: 7619816

Claim:
An article, comprising: a first layer including a plurality of rows of a first material extending along a first direction, the rows being spaced apart from each other and a center of each adjacent row being separated by a distance less than a wavelength λ; and a second layer supported by the first layer, the second layer comprising a second material, wherein the first layer is configured to transmit about 50% or more of radiation of the wavelength λ having a first polarization state incident on the first layer along a path and to specularly reflect about 80% or more of radiation of the wavelength λ having a second polarization state incident on the first layer along the path, the first and second polarization states being orthogonal, and the second layer is configured so that the article specularly reflects about 10% or less of the radiation of the wavelength λ having the second polarization incident on the article along the path, where the path intersects the first and second layers, wherein the second layer comprises a plurality of portions comprising the second material, the portions being spaced apart from each other and a center of each adjacent portion being separated by a distance more than the wavelength λ.