Patent ID: 8519325
Filing Date: 2013-08-27
Classification: G02B

Abstract:
1. An optical radiation concentrator for concentrating and transferring radiant energy, comprising: at least one angle selective optical filter, comprising a first sheet with a monolayer or multilayer structure, having substantially high transmittance for light that is incident from outside of said optical radiation concentrator upon an outer major surface of said angle selective optical filter within a designed transmitting incident angle range and also having substantially high reflectance for light that is incident from inside of said optical radiation concentrator upon an inner major surface of said angle selective optical filter within a designed reflecting incident angle range; at least one light redirecting reflector having a predetermined distance from said angle selective optical filter, comprising a second sheet that is substantially reflective, having at least one predetermined configuration of geometry, topography or micro-structure, for redirecting light that is incident from said angle selective optical filter towards at least one trapping direction, wherein said trapping direction has an incident angle to the inner major surface of said angle selective optical filter within said designed reflecting incident angle range so that said light will be trapped in said optical radiation concentrator and guided to at least one desired direction; and a transmission medium between said angle selective optical filter and said light redirecting reflector, wherein light propagating in said transmission medium will be trapped when the angle between said light and said inner major surface of said angle selective optical filter is within a trapping angle range, and wherein applying said angle selective optical filter substantially increases said trapping angle range than without said angle selective optical filter.