Plasmonic toroidal metamaterials at optical frequencies

Huang, Yao-Wei, Chen, Wei Ting, Wu, Pin Chieh, Ho, You Zhe, Chau, Yuan-Fong, Zheludev, Nikolay I. and Tsai, Din Ping (2012) Plasmonic toroidal metamaterials at optical frequencies. In, Progress In Electromagnetics Research Symposium (PIERS 2012), Kuala Lumpur, MY,


[img] PDF
Download (55Kb)


Toroidal dipole is created by currents flowing on a surface of a doughnut-shaped structure along its meridians first considered by Zel'dovich in 1957 [1]. Toroidal metamaterials were first theoretically proposed in 2007 [2]. In 2010, the toroidal metamaterials consisted by four three-dimensional resonant split rings show toroidal response in microwave region [3]. In this paper, we study the optical responses by integrating four U-shaped split-ring resonators (SRRs) together. The resonances of the four U-shaped SRRs array with magnetic field of incident light passing through the resonant rings was numerically investigated by using commercial software COMSOL 3.5a based on finite-element method (FEM). The permittivity of gold was described by the Lorentz-Drude model [4]. The size of a single U-shaped SRR is 250nm (arms) x 300nm (bottom) and 50nm line width wire loop. Simulation results shows toroidal and magnetic dipole resonance at free space wavelength 2520nm and 2620nm respectively. Incident light induced magnetic dipoles point in the same direction produced magnetic resonance. In contrast, four magnetic dipoles form a head-to-tail configuration which concentrates toroidal resonance.

Item Type: Conference or Workshop Item (Paper)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : Faculty of Physical Sciences and Engineering > Optoelectronics Research Centre
ePrint ID: 336519
Accepted Date and Publication Date:
Date Deposited: 28 Mar 2012 13:27
Last Modified: 31 Mar 2016 14:25

Actions (login required)

View Item View Item

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics