Spin-Direction Control of High-Order Plasmonic Vortex With Double-Ring Distributed Nanoslits
Spin-Direction Control of High-Order Plasmonic Vortex With Double-Ring Distributed Nanoslits
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DOI：
10.1109/lpt.2015.2390217
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发表时间：
2015-04-01
影响因子：
2.6
通讯作者：
Lee, Byoungho
中科院分区：
文献类型：
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作者：
Lee, Seung-Yeol;Kim, Sun-Je;Lee, Byoungho
提出了一种由圆形分布的纳米狭缝构成的等离子体涡旋透镜。结果表明，纳米缝的倾斜角变化沿着方位角方向提供了一个机会，以增加一个额外的轨道角动量（OAM）数的等离子体涡旋。利用双环形纳米缝分布，实现了表面等离子体激元沿方位角沿着的均匀振幅。与传统的PVL相比，所提出的结构具有优势，因为自旋辅助OAM数可以是任意整数值，这可以使高阶等离子体涡旋的自旋方向控制成为可能。
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.