Open AccessRole of asymmetric environment on the dark mode excitation in metamaterial analogue of electromagnetically-induced transparency
Author(s) -
Dong Zhang,
Hui Liu,
Mingxiang Xu,
Tao Li,
Shuming Wang,
Jingxiao Cao,
Shining Zhu,
Xiang Zhang
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.022412
Subject(s) - electromagnetically induced transparency , fano resonance , metamaterial , physics , resonator , excitation , optics , resonance (particle physics) , plasmon , split ring resonator , slow light , dipole , electric field , asymmetry , excited state , optoelectronics , atomic physics , photonic crystal , quantum mechanics
An otherwise dark magnetic dipole resonance in a split-ring resonator can be excited electrically with a Fano-type profile once the symmetric environment for this resonator is broken with respect to the polarized electric-field direction of incident waves. When this asymmetrically induced narrow resonance coincides with a broad dipolar resonance at an identical frequency regime, the metamaterial analogue of electromagnetically-induced transparency (EIT) window can be formed. We demonstrate that this environmental-asymmetry condition can be introduced dielectrically as well as plasmonically, either resonantly or nonresonantly, which indicates the plasmon coupling between different resonant modes is not responsible for the dark mode excitation. Thus, this result should contribute to the physical understanding on dark-mode excitation pathway for EIT-like phenomenon in plasmonic metamaterials.