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(Color online) (a) Schematic top view of the VDMD LRSP waveguide with a rounded 90° bend. [(b)–(d)] FDTD simulated -field distributions of SP waveguiding for the structure shown in (a). Vacuum wavelength of the input light is , , , and . The metal widths are varied, for (b), for (c), and for (d). The same intensity color bar scale is used in all panels.
(Color online) Real and imaginary parts of the propagation constants of symmetric and antisymmetric modes as functions of the widths of metal and dielectric layers for straight VDMD LRSP waveguides.
(Color online) FDTD simulations of SP waveguiding and bending along a metal surface covered with a thin layer of dielectric. The insets are schematics of the structures simulated in (a) for outer surface bending and (b) for inner surface bending. The vacuum wavelength is , , and . Widths of the dielectric layers are , radii of the bends are , and the metals are semi-infinitely broad.
Difference of the propagation constants of straight and bend parts of the VDMD LRSP waveguides as a function of bend radius for different orders of modes, , where .
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