Cogwheels for generation of surface plasmon polariton vortex

• Main Authors: Xu, Zhengji, Zhang, Dawei, Zhang, Dao Hua, Tobing, Landobasa Yosef Mario
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2016
• Subjects: cogwheels; surface plasmon polariton; SPP vortex; whispering gallery modes; WGMs; circular polarisation; air ring; air cogs; gold film; cogwheel design; optical vortex; cogwheel geometries; polarisation direction
• Online Access: https://hdl.handle.net/10356/81876; http://hdl.handle.net/10220/39691
• Institution: Nanyang Technological University

We propose a cogwheel structure formed by an air ring and equally distributed air cogs along the ring on a gold film for generation of surface plasmon polariton vortex. We show that a well-designed cogwheel can generate an optical vortex-like response and that the characteristics of such SPP vortex are directly related to cogwheel geometries and can be controlled by adjusting the polarisation direction of incident light.