Rigorous Modal Analysis of Chiral Nanoparticles,Advanced Optical Materials

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Rigorous Modal Analysis of Chiral Nanoparticles
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-06-30 , DOI: 10.1002/adom.202300599
Zhaolong Cao ₁ , Jinyang Li ₁ , Shaozhi Deng ₁ , Huanjun Chen ₁

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The physical origins of the chiroptical response from nanostructures are highly demanded for chiral photonics. The chiroptical response of a nanoparticle, whether measured along specific incident directions of exciting waves (when immobilized onto a substrate) or in solution through averaging responses across all structure orientations, is believed to stem from the interplay between three key factors: geometrical chirality, far-field chirality, and near-field chirality. This study aims to understand the relationship among these factors using a rigorous quasinormal mode (QNM) expansion method. By decomposing circular dichroism (CD) spectra into individual QNM contributions, it is observed that the chiroptical response with respect to incident directions depends on the extent of field overlapping between the QNM and light. In contrast, the near-field optical chirality (OC) is determined by the QNMs of the nanoparticle, independent of external excitations. As a proof-of-concept, a nanohelix metasurface is proposed that employs lossless gold and exploits the physics of bound states in the continuum to maximize the CD signal.

中文翻译：

手性纳米颗粒的严格模态分析

手性光子学非常需要纳米结构手性光学响应的物理起源。纳米颗粒的手性光学响应，无论是沿着激发波的特定入射方向（当固定在基底上时）测量，还是通过在所有结构方向上平均响应在溶液中测量，都被认为源于三个关键因素之间的相互作用：几何手性、远距离-场手性和近场手性。本研究旨在使用严格的拟正态模式（QNM）展开方法来了解这些因素之间的关系。通过将圆二色性 (CD) 光谱分解为单独的 QNM 贡献，可以观察到相对于入射方向的手性光学响应取决于 QNM 和光之间的场重叠程度。相比之下，近场光学手性 (OC) 由纳米粒子的 QNM 决定，与外部激励无关。作为概念验证，提出了一种纳米螺旋超表面，它采用无损金并利用连续体中束缚态的物理原理来最大化 CD 信号。

更新日期：2023-06-30

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