Abstract
By properly shaping its periodic profile, a thin-film dielectric grating can concentrate the power from an incident surface wave into a beam that appears selectively either above or below the grating. This property, which is analogous to blazing in diffraction gratings, is examined rigorously for a dielectric waveguide with an asymmetric grating profile. The waves guided by such a structure may exhibit strong directional characteristics, which offer potential applications to integrated-optics devices.
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