Abstract
In the recent Letter [Opt. Lett. 39, 781 (2014) [CrossRef] ] that proposes a method to design slanted parallelogram gratings based on the simplified modal method, the analysis of the modal field in the grating layer is incorrect; therefore, the validity of the equivalence between slanted parallelogram gratings and upright rectangular gratings that the authors thereby have deduced is questionable or at least in need of substantial modifications.
© 2014 Optical Society of America
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