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Type: Journal article
Title: Directional excitation of surface plasmons by dielectric resonators
Author: Zou, C.
Withayachumnankul, W.
Shadrivov, I.
Kivshar, Y.
Fumeaux, C.
Citation: Physical Review B, 2015; 91(8):085433-1-085433-8
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1098-0121
Statement of
Chengjun Zou, Withawat Withayachumnankul, Ilya V. Shadrivov, Yuri S. Kivshar, and Christophe Fumeaux
Abstract: An important aim of current research on plasmonics is to develop compact components to manipulate surface plasmon polaritons (SPPs) and specifically to develop efficient SPP couplers. The commonly used metallic resonators are inefficient to couple free-space waves to SPPs and metallic gratings require oblique incidence for achieving unidirectional propagation. In this article, we propose to use nanoscale nonuniform arrays of dielectric resonator antennas (DRAs) to realize unidirectional launching of SPPs. DRAs are made of low-loss high-permittivity nanostructures operating on a metal surface. The applications of metallodielectric nanostructures can produce resonances mainly in the low-loss dielectric parts and hence the power dissipated through oscillating current in metal can be reduced. Similar tometallic resonators, DRAs operating near resonance can provide phase control when coupling incident waves into SPPs, adding degrees of freedom in controlling propagation direction. The theoretical analysis in this article, with numerical validation, shows efficient SPPs launching by nonuniform array of cylindrical DRAs into a predesigned direction. Furthermore, with proper patterning, optimal launching can be achieved by avoiding power leakage via deflection into free space. The SPP launching condition and the influence of propagation loss are also mathematically analyzed from the viewpoint of antenna array theory. The SPPs launchers based on DRAs have a potential for applications in highly efficient integrated optics and optical waveguides.
Rights: © 2015 American Physical Society
RMID: 0030025228
DOI: 10.1103/PhysRevB.91.085433
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Appears in Collections:Electrical and Electronic Engineering publications

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