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Fano resonance by dipole-hexapole coupling in a chi-shaped plasmonic nanostructure

机译:Chi形等离激元纳米结构中的偶极-六极偶合耦合的磁场。

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摘要

We demonstrate that pronounced Fano resonance can be obtained by dipole-hexapole coupling in a chi-shaped plasmonic nanostructure. The confined local field in the vicinity of dipole-resonant nanorods excites and coherently couples to the hexapolar mode in the rod perpendicular to the polarization direction of the incident wave, leading to strong Fano resonance. By using the discrete dipole approximation, we numerically investigate the behavior of Fano resonance by dipole-hexapole coupling in the plasmonic nanostructure. We obtain the parameters relevant to Fano resonance by fitting the coupled oscillator model equation to the calculated extinction data and investigate their dependencies on the structural parameters. The results demonstrate the possibility of obtaining high-contrast Fano resonance with narrow features by using this plasmonic nanostructure, which has potential applications for highly sensitive biological sensing, low-loss metamaterials, and others. (C) 2015 Optical Society of America
机译:我们证明了明显的Fano共振可以通过在Chi形等离子体纳米结构中的偶极-六极耦合获得。偶极子谐振纳米棒附近的局域局部场激发并相干地耦合到垂直于入射波偏振方向的棒中的六极模式,从而导致强烈的Fano谐振。通过使用离散偶极近似,我们通过等离子-六极耦合在等离子体纳米结构中数值研究了Fano共振的行为。通过将耦合的振荡器模型方程拟合到计算的消光数据,我们获得了与Fano共振相关的参数,并研究了它们对结构参数的依赖性。结果表明,通过使用这种等离子纳米结构,可以获得具有窄特征的高对比度Fano共振的可能性,该等离子纳米结构在高灵敏度生物传感,低损耗超材料等方面具有潜在的应用。 (C)2015年美国眼镜学会

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