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Modeling and analysis of optical properties of a gold nanoring based on electric and magnetic dipoles

机译:基于电和磁偶极子的金纳米环的光学特性建模和分析

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The optical behavior of a plane-wave excited gold nanoring (NR), originated from localized surface plasmon resonance is modeled by two coupled electric-and magnetic-point dipoles. Considering the extinction cross-section spectrum, it is found that the electric-dipole effect is dominant in comparison with the magnetic-dipole effect although the magnetic-dipole signature is observable in the near-field response of the NR. In addition, the far-field electromagnetic radiation pattern of the NR verifies the corresponding radiation pattern of the point dipoles. The numerical simulation near-field results are in agreement with the proposed electric-and magnetic-dipole theory. (C) 2015 Optical Society of America
机译:平面波激发金纳米环(NR)源自局部表面等离振子共振的光学行为是由两个耦合的电和磁点偶极子模拟的。考虑到消光截面谱,发现尽管偶极子波在近场响应中可观察到偶极子磁波,但与偶极子波相比,偶极子电波是占主导地位的。此外,NR的远场电磁辐射图验证了点偶极子的相应辐射图。数值模拟的近场结果与提出的电偶极子理论是一致的。 (C)2015年美国眼镜学会

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