2 May 2012 Light-guide-based diffractive solar concentrators
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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ties M. de Jong, Ties M. de Jong, Dick K. G. de Boer, Dick K. G. de Boer, Cees W. M. Bastiaansen, 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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