Tunable Fano Resonance in E-Shape Plasmonic Nanocavities

被引：41
作者：
Sun, Bo [1 ,2 ]
Zhao, Lixia [1 ]
Wang, Chao [3 ]
Yi, Xiaoyan [1 ]
Liu, Zhiqiang [1 ]
Wang, Guohong [1 ]
Li, Jinmin [1 ]
机构：
[1] Chinese Acad Sci, Inst Semicond, Semicond Lighting Technol Res & Dev Ctr, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[3] Univ Elect Sci & Technol China, Sch Energy Sci & Engn, Chengdu 611731, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 43期
关键词：
SYMMETRY-BREAKING; GOLD NANORINGS; CLUSTERS; NANOSTRUCTURES; METAMATERIALS; INTERFERENCE; LIGHT;
D O I：
10.1021/jp4105882
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The optical properties of e-shape plasmonic nanocavities have been studied. Due to the destructive interference of the quadrupole resonance of the c-shape nanoring with the overlapping dipolar resonance of the nanorod, a tunable Fano resonance within a wide range of spectra from visible light to mid-infrared (mid-IR) spectrum have been observed. The spectral positions and modulation depths of the Fano resonances can be tuned with different geometry parameters of nanocavities, and the performance (modulation depth of spectra and near-field enhancement) of e-shape plasmonic nanocavities can be further improved by optimization of the nanocavity radiation characteristics using a dielectric layer (SiO2). Furthermore, capacitive coupling between c-shape nanoring and nanorod antenna was found to be asymmetric, in which Fano resonance can be modulated to symmetric/antisymmetric quadrupoledipole by moving the nanorod in the positive/negative direction of the x axis. This work opens up new opportunities for engineering spectral features and optimizing performance of a broad range of plasmonics devices.
引用
收藏
页码：25124 / 25131
页数：8
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