2 May 2012 Light-guide-based diffractive solar concentrators
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Abstract
Compact and inexpensive solar concentrators can be designed by using transmission gratings that diffract incident sunlight into a light guide. To this end a grating should have a small period and maintain a high diffraction efficiency over a wide range of incident angles. We numerically study the angular dependence of the diffraction efficiency of surface-relief gratings using Rigorous Coupled-Wave Analysis. It is shown how one can control the angular acceptance of gratings by tuning the refractive index or the grating topology. Gratings with a high refractive index maintain a high diffraction efficiency over a wide range of incident angles. By adjusting the topological symmetry one can design a grating with a high diffraction efficiency over a narrow range of incident angles, or a grating with a more homogenous distribution of the diffraction efficiency.
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Ties M. de Jong, Dick K. G. de Boer, Cees W. M. Bastiaansen, "Light-guide-based diffractive solar concentrators", Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 84380X (2 May 2012); doi: 10.1117/12.922001; https://doi.org/10.1117/12.922001
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