Patent ID: 8515223

Claim:
A lens, comprising: a substrate comprising a first side and an opposite second side; a first guided mode resonance grating supported by the first side of the substrate, wherein the first guided mode resonance grating comprises a plurality of spaced apart elongated elements, wherein each element of the first guided mode resonance has a substantially flat surface that extends along a first common plane; a second guided mode resonance grating supported by the second side of the substrate and offset from the first guided mode resonance grating, the second guided mode resonance grating being configured to shape and reflect a wave front of an incident optical beam within the substrate towards the first guided mode resonance grating, wherein the second guided mode resonance grating comprises a plurality of spaced apart elongated elements, wherein each element of the second guided mode resonance has a substantially flat surface that extends along a second common plane; and wherein the first guided mode resonance grating is configured to redirect the reflected incident optical beam out of the second side of the substrate.