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Proceedings Paper

Angular dependence of surface-relief gratings for solar and lighting applications
Author(s): Ties M. de Jong; Dick K. G. de Boer; Cees W. M. Bastiaansen
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Paper Abstract

Transmission gratings that combine a large diffraction angle with a high diffraction efficiency and low angular and wavelength dispersion can be used to concentrate sunlight in a light guide and for lighting applications. Surface-relief gratings with sub-wavelength grating periods can have these properties. In this paper we study their diffraction efficiency for general conical angles of incidence. We show the presence of regions in the space of incident angles where light is efficiently coupled into or out of total internal reflection. It is demonstrated how this distribution of the diffraction efficiency over angular space can be adjusted by changing the grating geometry. Finally, these properties are qualitatively verified using holographically produced surface relief gratings.

Paper Details

Date Published: 21 September 2011
PDF: 8 pages
Proc. SPIE 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII, 81240D (21 September 2011); doi: 10.1117/12.893311
Show Author Affiliations
Ties M. de Jong, Eindhoven Univ. of Technology (Netherlands)
Dick K. G. de Boer, Philips Research Europe (Netherlands)
Cees W. M. Bastiaansen, Eindhoven Univ. of Technology (Netherlands)
Queen Mary Univ. of London (United Kingdom)

Published in SPIE Proceedings Vol. 8124:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII
Roland Winston; Jeffrey M. Gordon, Editor(s)

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