Zhang Di, Xiang Jin, Liu Hongfeng, Deng Fu, Liu Haiying, Ouyang Min, Fan Haihua, Dai Qiaofeng
Opt Express. 2017 Oct 30;25(22):26704-26713. doi: 10.1364/OE.25.026704.
The optical properties of a Si-Au heterodimer nanostructure, which is composed of an Au split nanoring surrounded by a Si nanoring with a larger diameter, are investigated both theoretically and numerically. It is found that a pure magnetic plasmon Fano resonance can be achieved in the Si-Au heterodimer nanostructure when it is excited by an azimuthally polarized beam. It is revealed that the pure magnetic Fano resonance is generated by the destructive interference between the magnetic dipole resonance of the Si nanoring and the magnetic dipole resonance of the Au split nanoring. A coupled oscillator model is employed to analyze the Fano resonance of the Si-Au heterodimer nanostructure. The pure magnetic response of the Si-Au heterodimer nanostructure is verified by the current density distributions and the scattering powers of the electric and magnetic multipoles. The Fano resonance in the Si-Au heterodimer nanostructure exhibits potential applications of low-loss magnetic plasmon resonance in the construction of artificial magnetic metamaterials.
研究了一种硅-金异质二聚体纳米结构的光学性质，该结构由一个被较大直径的硅纳米环包围的金分裂纳米环组成，采用理论和数值方法进行研究。结果发现，当用方位角偏振光束激发时，硅-金异质二聚体纳米结构中可实现纯磁等离子体法诺共振。结果表明，纯磁法诺共振是由硅纳米环的磁偶极共振与金分裂纳米环的磁偶极共振之间的相消干涉产生的。采用耦合振子模型分析硅-金异质二聚体纳米结构的法诺共振。通过电流密度分布以及电多极子和磁多极子的散射功率验证了硅-金异质二聚体纳米结构的纯磁响应。硅-金异质二聚体纳米结构中的法诺共振在人工磁超材料的构建中展现出低损耗磁等离子体共振的潜在应用。
