FDTD Analysis of Sub-Wavelength Focusing Phenomena in Plasmonic Meta-Screens

Author

Ludwig, Alon ; Eleftheriades, George V. ; Sarris, Costas D.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada

Volume

30

Issue

13

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

2054

Lastpage

2061

Abstract

The Finite-Difference Time-Domain (FDTD) method is used to study the frequency dependence of the transmission through a plasmonic screen with slots of sizes and spacing that were chosen using the spatially shifted beam approach to achieve subwavelength focusing. It is shown that the electric field beamwidth at the focal plane exhibits a resonance-like behavior in the vicinity of the frequency for which the meta-screen was designed to work. At this frequency range, the power flow path is shown to exhibit circulation around the slotted screen. Results are also compared with those given in [1] for a similar device working at a lower frequency range where the metallic screen behaves as a perfect electric conductor.

Keywords

finite difference time-domain analysis; optical focusing; plasmonics; FDTD analysis; electric field beamwidth; finite-difference time-domain method; focal plane; frequency dependence; metallic screen; perfect electric conductor; plasmonic meta-screens; plasmonic screen; power flow path; resonance-like behavior; slotted screen; spatially shifted beam approach; sub-wavelength focusing phenomena; Finite difference methods; Focusing; Frequency measurement; Plasmons; Resonant frequency; Satellites; Time domain analysis; Aperture antennas; finite difference methods; optical beam focusing; optical diffraction;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2012.2191264

Filename

6171813