Patent ID: 9354362
Filing Date: 2016-05-31
CPC Classification: G02B

Claim Text:
1. An optical device comprising: a first substantially planar reflective structure; a second substantially planar reflective structure; a substantially planar sub-wavelength diffraction grating layer disposed between the first reflective structure and the second reflective structure, wherein at least one of the first reflective structure and the second reflective structure are configured as sub-wavelength diffraction grating layers, wherein the substantially planar sub-wavelength diffraction grating layer is configured with lines having line widths, line thicknesses, and line period spacing selected to control phase changes in different portions of a beam of light transmitted through the optical device; a first resonant cavity formed between the first reflective structure and the substantially planar sub-wavelength diffraction grating layer; and a second resonant cavity formed between the second reflective structure and the substantially planar sub-wavelength diffraction grating layer.