Quasinormal-Mode Non-Hermitian Modeling and Design in Nonlinear Nano-Optics
Quasinormal-Mode Non-Hermitian Modeling and Design in Nonlinear Nano-Optics
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DOI：
10.1021/acsphotonics.0c00014
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发表时间：
2020-05-20
期刊：
影响因子：
7
通讯作者：
Lalanne, Philippe
中科院分区：
文献类型：
--
作者：
Gigli, Carlo;Wu, Tong;Lalanne, Philippe
提出了一种新的理论非厄米形式的非线性纳米光学分析。它的主要优势在于它以独特的方式分析结合了纳米结构的准正规模式，这些模式必须被共振激发以实现显着的非线性效率。由于解析性，形式主义是计算上更有效的比通常的多极米氏散射展开的非线性纳米光学。它也更普遍，适用于放置在基底上或嵌入薄膜中的纳米结构。它还提供了非线性光子纳米结构的多参数设计和优化的指导方针。特别是，它揭示了一个重要的相位匹配条件在亚波长尺度之间的线性和非线性谐波，这是没有澄清在早期的理论工作的基础上，波导和高Q腔的厄米理论。它的封闭形式是一个主要的资产，使我们能够提出一个系统的方法来设计相位匹配的纳米结构，提供显着的二次谐波产生增强工程。(2)和泵浦光束。
A novel theoretical non-Hermitian formalism for analyzing nonlinear nano-optics is proposed. Its main strength lies in the unique way it analytically incorporates the quasinormal modes of the nanostructures, which have to be resonantly excited to achieve significant nonlinear efficiency. Owing to the analyticity, the formalism is computationally more effective than the usual multipolar Mie-scattering expansions for nonlinear nano-optics. It is also more general and applies to nanostructures laying on substrates or embedded in thin films. It additionally provides guidelines for the multiparameter design and optimization of nonlinear photonic nanostructures. In particular, it reveals an important phase-matching condition at the subwavelength scale between the linear and nonlinear harmonics, which was not clarified in earlier theoretical works based on Hermitian theory for waveguides and high-Q cavities. Its closed form is a major asset that enables us to propose a systematic approach to design phased-matched nanostructures offering drastic second harmonic generation enhancements with engineered.(2) and pump beams.