Patent ID: 9442227
Filing Date: 2016-09-13
CPC Classification: G02B,H01L,Y02E

Claim Text:
1. A method of concentrating light using a solar concentrator, said method comprising the steps of (i) providing subwavelength gratings on top and bottom surfaces of a planar substrate; and (ii) optimizing said subwavelength gratings for minimizing 0 wherein, C max is concentration ratio, r d is diffraction efficiency of incoming light into ±1T modes, r dt is diffraction efficiency of +1T mode into −1T mode and vice versa, θ is diffraction angle given by θ=sin −1 (λ/Λ*n substrate ) in the limit of large W/t where W is width of the solar concentrator, t is thickness of the solar concentrator, Λ is period of the subwavelength gratings and n substrate is refractive index of the substrate.