Multi-layered waveguide for capturing solar energy
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United States of America Patent
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Oct 25, 2016
Grant Date -
Oct 23, 2014
app pub date -
Apr 22, 2014
filing date -
Apr 23, 2013
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Abstract
A waveguide for use in solar power systems to capture sunlight without solar tracking. The waveguide includes a first transparent layer with a first surface receiving sunlight, and the waveguide includes a second surface, opposite the first surface of the first layer, including recessed surfaces (or “microstructures”) each defined by sidewalls extending from the second surface toward the first surface of the first layer. The waveguide includes a second layer of transparent material with a first surface proximate to the second surface of the first layer for receiving a portion of the sunlight transmitted through the first layer. The second layer has a second surface, opposite the first surface, including recessed surfaces of the same or differing shape, size, location, and orientation as those of the first layer. The recessed surfaces of the first and second layers capture sunlight of differing ranges of incidence angles with total internal reflection (TIR).
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