Patent ID: 7088510

Claim:
An anti-aliasing filter for use in a device including a photodetector array having a plurality of pixels, comprising: a substrate; a first double-refraction plate (“DRP”) adapted to separate an incoming ray of light into an ordinary ray and an extraordinary ray having different polarization states, the DRP having at least a first liquid photo-polymerization (“LPP”) layer having an optical axis oriented at an angle non-parallel and non-perpendicular to a surface of the LPP layer, the first LPP layer connected to the substrate, and a first liquid-crystal polymer (“LCP”) layer disposed on the first LPP layer having an optical axis aligned with the orientation of the optical axis of the LPP layer, the orientation comprising an optical axis of the first DRP, the first DRP having a thickness and an optical axis selected so as to provide a selected separation, d, of ordinary and extraordinary light rays such that d is large enough for the separated ordinary and extraordinary light rays to substantially illuminate two adjacent pixels of the photodetector array.