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Opt Express. 2010 Jan 18;18(2):1122-33. doi: 10.1364/OE.18.001122.

Planar micro-optic solar concentrator.

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  • 1Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093-0407, USA.


We present a new approach to solar concentration where sunlight collected by each lens in a two-dimensional lens array is coupled into a shared, planar waveguide using localized features placed at each lens focus. This geometry yields a thin, flat profile for moderate concentration systems which may be fabricated by low-cost roll manufacture. We provide analyses of tradeoffs and show optimized designs can achieve 90% and 82% optical efficiency at 73x and 300x concentration, respectively. Finally, we present preliminary experimental results of a concentrator using self-aligned reflective coupling features fabricated by exposing molded SU-8 features through the lens array.

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