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Structure of an arc nanoribbon waveguide on substrate. (a) 3D view, (b) top view with curvilinear coordinates , and (c) cross-section illustration with size and material parameter set.
(Color online) Dispersions of guided modes for (a) a straight waveguide and (b) a curved waveguide with . Here is the supercell constant and . The dashed line is the light line in substrate: . The left (right) insets are distribution of the first (second) mode at .
Self-transmission of the first six modes for: (a) a “U” structure of , (b) an “L” structure of , and (c) a “U” structure of .
Self-transmission of the first six modes for the structure in the inset but of two periods of fluctuation, when , , and . Inset: Illustration of a waveguide containing a rippling section.
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