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Controlling light in different structures of dielectric-loaded plasmonic waveguide

We demonstrate how light can be controlled and guided in various dielectric-loaded plasmonic waveguides which consist of a dielectric nanowire suspended above a gold film. The different shapes of the dielectric nanowires on the gold film are characterized by means of the mode profile. Results show that the shapes of nanowires play a significant role on the performance of the waveguides. In addition, the plasmonic wavelength selective device is also discussed which is based on hetero-surface plasmons in layered structures where a hetero-dielectric nanowire is loaded on a metallic film. Our proposed structures can efficiently route and filter the light where the selective wavelength can be tuned by different geometries or refractive indexes of the hetero-dielectric nanowires.