Title: Cogwheels for generation of surface plasmon polariton vortex

Authors: Zhengji Xu; Landobasa Y.M. Tobing; Dawei Zhang; Dao Hua Zhang

Addresses: School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue 639798, Singapore ' School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue 639798, Singapore ' Shanghai Key Laboratory of Modern Optics System, School of Optics-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, 200093 Shanghai, China ' School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue 639798, Singapore

Abstract: 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.

Keywords: 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.

DOI: 10.1504/IJNT.2015.071802

International Journal of Nanotechnology, 2015 Vol.12 No.10/11/12, pp.909 - 916

Published online: 18 Sep 2015 *

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