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A nanoslit is capable of performing versatile functions in nanophotonic applications. In this invited paper, we discuss the physics and manipulation methods of surface plasmon excitation such as directional switching at a nanoslit. Furthermore, enhancing the light intensity passing through a nanoslit by employing embedded metallic nanoislands is experimentally presented and numerically analyzed.
The use of plasmonics for light beam focusing, splitting, directional beaming and vortex generation will be discussed. Plasmonic hot spot generation methods using metallic apertures will also be discussed and compared.
We investigate the polarization singularities in the metal-insulator-metal (MIM) plasmonic waveguide structure. It turns out that there exist L-line and C-point polarization singularities for the antisymmetric plasmonic mode in the MIM plasmonic waveguide. These polarization singularities have unique properties because they exist on a subwavelength plane parallel to the direction of propagation of...
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