Cylindrical vector beams reveal radiationless anapole condition in a resonant state

IF 15.3 1区 物理与天体物理 Q1 OPTICS Opto-Electronic Advances Pub Date : 2021-04-22 DOI:10.29026/oea.2022.210014
Yudong Lu, Yi Xu, Ouyang Xu, Mingcong Xian, Yaoyu Cao, Kai Chen, Xiangping Li
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引用次数: 15

Abstract

Nonscattering optical anapole condition is corresponding to the excitation of radiationless field distributions in open resonators, which offers new degrees of freedom for tailoring light-matter interaction. Conventional mechanisms for achieving such a condition relies on sophisticated manipulation of electromagnetic multipolar moments of all orders to guarantee superpositions of vanished moment strengths at the same wavelength. In contrast, here we report on the excitation of optical radiationless anapole hidden in a resonant state of a Si nanoparticle utilizing tightly focused radially polarized (RP) beam. The coexistence of magnetic resonant state and anapole condition at the same wavelength further enables the triggering of resonant state by tightly focused azimuthally polarized (AP) beam whose corresponding electric multipole coefficient could be zero. As a result, high contrast inter-transition between radiationless anapole condition and ideal magnetic resonant scattering can be achieved experimentally in visible spectrum. The proposed mechanism is general which can be realized in different types of nanostructures. Our results showcase that the unique combination of structured light and structured Mie resonances could provide new degrees of freedom for tailoring light-matter interaction, which might shed new light on functional meta-optics.
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圆柱矢量光束在谐振状态下显示无辐射拟极点状态
非散射光学拟极点条件对应于开放谐振腔中无辐射场分布的激发,为调整光-物质相互作用提供了新的自由度。实现这种条件的传统机制依赖于对所有阶的电磁多极矩的复杂操纵,以保证在同一波长上消失的矩强度的叠加。与此相反,本文报道了利用紧聚焦径向极化(RP)光束激发隐藏在硅纳米粒子共振状态下的无辐射光学拟极点。磁谐振态和拟极点条件在同一波长的共存,进一步使得紧密聚焦的方位角极化光束触发谐振态,其对应的电多极系数可以为零。实验结果表明,在可见光谱中可以实现无辐射拟极点条件与理想磁谐振散射之间的高对比度间跃迁。所提出的机制是通用的,可以在不同类型的纳米结构中实现。我们的研究结果表明,结构光和结构Mie共振的独特组合可以为定制光-物质相互作用提供新的自由度,这可能为功能元光学提供新的思路。
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来源期刊
CiteScore
19.30
自引率
7.10%
发文量
128
期刊介绍: Opto-Electronic Advances (OEA) is a distinguished scientific journal that has made significant strides since its inception in March 2018. Here's a collated summary of its key features and accomplishments: Impact Factor and Ranking: OEA boasts an impressive Impact Factor of 14.1, which positions it within the Q1 quartiles of the Optics category. This high ranking indicates that the journal is among the top 25% of its field in terms of citation impact. Open Access and Peer Review: As an open access journal, OEA ensures that research findings are freely available to the global scientific community, promoting wider dissemination and collaboration. It upholds rigorous academic standards through a peer review process, ensuring the quality and integrity of the published research. Database Indexing: OEA's content is indexed in several prestigious databases, including the Science Citation Index (SCI), Engineering Index (EI), Scopus, Chemical Abstracts (CA), and the Index to Chinese Periodical Articles (ICI). This broad indexing facilitates easy access to the journal's articles by researchers worldwide. Scope and Purpose: OEA is committed to serving as a platform for the exchange of knowledge through the publication of high-quality empirical and theoretical research papers. It covers a wide range of topics within the broad area of optics, photonics, and optoelectronics, catering to researchers, academicians, professionals, practitioners, and students alike.
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