Open AccessDispersion-tunable designer-plasmonic resonator with enhanced high-order resonances
Author(s) -
Fei Gao,
Zhen Gao,
Xihang Shi,
Zhаoju Yang,
Xiao Lin,
Baile Zhang
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.006896
Subject(s) - plasmon , ground plane , resonator , metamaterial , optics , dispersion (optics) , resonance (particle physics) , planar , optoelectronics , dielectric , materials science , surface plasmon polariton , surface plasmon , physics , telecommunications , antenna (radio) , atomic physics , computer science , computer graphics (images)
We propose and experimentally demonstrate an approach to efficiently tune the dispersion of a designer-plasmonic resonator, or a plasmonic 'meta-atom', by incorporating an extra ground plane underneath. We demonstrate that this ground plane is able to enhance resonances, and the enhancing effect can render those higher-order azimuthal modes, being absent in previously reported designer-plasmonic resonators, experimentally observable. After incorporating the ground plane, all resonance modes are red shifted with their Q factors enhanced. By increasing the separation from the planar resonator to the underneath ground plane, all enhanced modes are blue shifted with Q factors decreased slightly, whose trend is opposite to increasing the thickness of a dielectric substrate of a common meta-atom without a ground. These results may find potential applications in tunable designer-plasmonic sensors and plasmonic metamaterial designs.