Tunable Fano Resonance in E-Shape Plasmonic Nanocavities

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• 作者：Bo Sun ; Lixia Zhao ; Chao Wang ; Xiaoyan Yi ; Zhiqiang Liu ; Guohong Wang ; Jinmin Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 30, 2014
• 年：2014
• 卷：118
• 期：43
• 页码：25124-25131
• 全文大小：556K
• ISSN：1932-7455

文摘

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鈥?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 quadrupole鈥揹ipole 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.