Abstract
In the recent Letter [Opt. Lett.39, 781 (2014)10.1364/OL.39.000781OPLEDP0146-9592] 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.
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