Light trapping optical structure

  • US 9,678,321 B2
  • Filed: 02/14/2014
  • Issued: 06/13/2017
  • Est. Priority Date: 04/21/2009
  • Status: Active Grant
First Claim
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1. An optical structure, comprising:

  • a layer of optically transmissive material defined by a first broad area surface and an opposing second broad area surface extending parallel to said first surface;

    an optically absorptive layer disposed in contact with said second surface and in an energy exchange relationship with said layer of optically transmissive material; and

    a plurality of light deflecting elements distributed within said layer of optically transmissive material;

    wherein each of the plurality of said light deflecting elements is configured to deflect a light ray propagating transversally through said layer of optically transmissive material away from a surface normal so as to form a propagation angle of said light ray with respect to said surface normal, above a predefined critical angle, and wherein said predefined critical angle is selected to result in a multiple transversal passage of light through said optically absorptive layer.

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