Title :
Spin-Direction Control of High-Order Plasmonic Vortex With Double-Ring Distributed Nanoslits
Author :
Seung-Yeol Lee ; Sun-Je Kim ; Hyounghan Kwon ; Byoungho Lee
Author_Institution :
Nat. Creative Res. Center for Active Plasmonics Applic. Syst., Seoul Nat. Univ., Seoul, South Korea
Abstract :
A plasmonic vortex lens (PVL) consisting of circularly distributed nanoslits is proposed. It is shown that the tilted angle variance of nanoslits along the azimuthal direction gives an opportunity to add an additional orbital angular momentum (OAM) number to the plasmonic vortex. Using the double-ring nanoslit distribution, homogeneous amplitude of excited surface plasmon along the azimuthal angle is achieved. The proposed structure has advantages compared with conventional PVLs since the spin-assisted OAM number can be an arbitrary integer value, which can enable the spin-direction control of high-order plasmonic vortex.
Keywords :
angular momentum; lenses; nanophotonics; optical variables control; optical vortices; plasmonics; surface plasmons; arbitrary integer value; azimuthal angle; azimuthal direction; circularly distributed nanoslits; conventional PVL; double-ring nanoslit distribution; excited surface plasmon; high-order plasmonic vortex; homogeneous amplitude; orbital angular momentum number; plasmonic vortex lens; spin-assisted OAM number; spin-direction control; tilted angle variance; Lenses; Optical distortion; Optical polarization; Optical surface waves; Optical vortices; Plasmons; Surface waves; Nanoslits; Plasmonic vortex lens; Surface plasmons; nanoslits; plasmonic vortex lens;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2390217
