Up-scalable method to amplify the diffraction efficiency of simple gratings

An innovative class of coupling gratings for efficiently redirecting light beams is described. They are based on symmetric binary gratings equipped with an asymmetric high refractive index coating. This kind of structure exhibits a grating blaze effect and produces high diffraction efficiencies. Coupling gratings based on the described principle have been fabricated by UV casting and subsequent oblique ZnS evaporation. The gratings were characterized by measuring their diffraction efficiencies. For unpolarized light, efficiencies of around 70% have been measured at 510 nm wavelength. Simulations revealed that diffraction efficiencies of up to 90% can be obtained for polarized light. (C) 2014 Optical Society of America


Published in:
Optics Letters, 39, 23, 6557-6560
Year:
2014
Publisher:
Washington, Optical Society of America
ISSN:
0146-9592
Laboratories:




 Record created 2015-02-20, last modified 2018-09-13


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