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Ab initio theory of Fano resonances in plasmonic nanostructures and metamaterials

机译:等离子体纳米结构和超材料中的Fano共振从头算理论

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摘要

An ab initio theory for Fano resonances in plasmonic nanostructures and metamaterials is developed using the Feshbach formalism. It reveals the role played by the electromagnetic modes and material losses in the system, and enables the engineering of Fano resonances in arbitrary geometries. A general formula for the asymmetric resonance in a nonconservative system is derived. The influence of the electromagnetic interactions on the resonance line shape is discussed and it is shown that intrinsic losses drive the resonance contrast, while its width is determined mostly by the coupling strength between the nonradiative mode and the continuum. The analytical model is in perfect agreement with numerical simulations.
机译:使用Feshbach形式主义发展了等离激元纳米结构和超材料中Fano共振的从头算理论。它揭示了电磁模式和系统中的材料损耗所起的作用,并实现了在任意几何形状中的Fano共振工程。推导了非保守系统中非对称共振的一般公式。讨论了电磁相互作用对谐振线形状的影响,结果表明,固有损耗驱动谐振对比度,而其宽度主要由非辐射模式与连续谱之间的耦合强度决定。该分析模型与数值模拟完全吻合。

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