High-Q magnetic toroidal dipole resonance in all-dielectric metasurfaces

IF 5.4 1区 物理与天体物理 Q1 OPTICS APL Photonics Pub Date : 2024-07-02 DOI:10.1063/5.0208936
Ying Zhang, Lulu Wang, Haoxuan He, Hong Duan, Jing Huang, Chenggui Gao, Shaojun You, Lujun Huang, Andrey E. Miroshnichenko, Chaobiao Zhou
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Abstract

High quality (Q) factor toroidal dipole (TD) resonances have played an increasingly important role in enhancing light–matter interactions. Interestingly, TDs share a similar far-field distribution as the conventional electric/magnetic dipoles but have distinct near-field profiles from them. While most reported works focused on the electric TD, magnetic TDs (MTDs), particularly high-Q MTD, have not been fully explored yet. Here, we successfully realized a high-Q MTD by effectively harnessing the ultrahigh Q-factor guided mode resonances supported in an all-dielectric metasurface, that is, changing the interspacing between silicon nanobar dimers. Other salient properties include the stable resonance wavelength but a precisely tailored Q-factor by interspacing distance. A multipole decomposition analysis indicates that this mode is dominated by the MTD, where the electric fields are mainly confined within the dielectric nanostructures, while the induced magnetic dipole loops are connected head-to-tail. Finally, we experimentally demonstrated such high-Q MTD resonance by fabricating a series of silicon metasurfaces and measuring their transmission spectra. The MTD resonance is characterized by a sharp Fano resonance in the transmission spectrum. The maximum measured Q-factor is up to 5079. Our results provide useful guidance for realizing high-Q MTD and may find exciting applications in boosting light–matter interactions.
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全介质元表面中的高 Q 磁环偶极共振
高质量(Q)因子环状偶极子(TD)共振在增强光物质相互作用方面发挥着越来越重要的作用。有趣的是,TD 与传统的电偶极/磁偶极有着相似的远场分布,但却有着不同的近场分布。虽然大多数报道都集中在电TD上,但磁TD(MTD),尤其是高Q MTD,尚未得到充分探索。在这里,我们通过有效利用全介质元表面支持的超高 Q 因子导模共振,即改变硅纳米棒二聚体之间的间隔,成功实现了高 Q 值 MTD。其他突出特性包括共振波长稳定,但Q因子可通过间隔距离精确定制。多极分解分析表明,该模式由 MTD 主导,其中电场主要局限在介电纳米结构内,而诱导磁偶极环则头尾相连。最后,我们通过制作一系列硅元表面并测量其透射光谱,在实验中证明了这种高 Q 值 MTD 共振。MTD 共振的特点是透射光谱中存在尖锐的法诺共振。测得的最大 Q 因子高达 5079。我们的研究结果为实现高 Q 值 MTD 提供了有用的指导,并可能在促进光物质相互作用方面找到令人兴奋的应用。
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来源期刊
APL Photonics
APL Photonics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍: APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.
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