论文标题
由混合氨基烷态提供的非平凡的纯零散射状态
Nontrivial Pure Zero-Scattering Regime Delivered by a Hybrid Anapole State
论文作者
论文摘要
通过介电和半导体组件交付的纳米级电力和磁成分的能力,正在为新型的源和纳米剂的新型源和纳米剂铺平道路。同时已广泛利用对应物,以从隔离纳米孔子的单个散射通道中取消辐射,同时显示非平凡的近场。因此,已经宣称Anapole状态与非辐射来源相对应。然而,这些状态通常与高阶多极矩一起发现,具有非零的整体远场。在本文中,我们从理论上和实验上证明了一个完全非散落的状态,该状态受新颖的4倍杂交anapole控制的状态,其所有主要的多极端被其相应的环形(延迟)术语抑制,即SuperScaltering效应的深色类似物。然而,这种隐形状态允许通过准正常模态扩展所证明的谐振mie和fabry-perot模式的唯一相互作用来实现非平凡的近场图。此外,杂化斜杆态被证明是受保护的。在存在具有显着高折射率的底物的情况下,非散射点的光谱位置保持不受干扰。我们通过对单个纳米固定器的散射响应的黑场测量结果来实验验证我们的新作用。结果是对有效的感应和拉曼散射设置的需求很高,具有增强的信号噪声比,用于相处的高度传播元信息,全息图,以及大量的线性和非线性应用在介电纳米光子方中。
The ability to manipulate electric and magnetic components of light at the nanoscale delivered by dielectric and semiconductor components is paving the way towards novel types of sources and nanoantennae with exceptional electromagnetic signatures, flexible and tunable metasurface architectures, enhanced light harvesting structures, etc. Recently, the anapoles states arising from the destructive interference of basic multipoles and their toroidal counterparts have been widely exploited to cancel radiation from an individual scattering channel of isolated nanoresonators, while displaying nontrivial near fields. As such, anapole states have been claimed to correspond to non-radiating sources. Nevertheless, these states are commonly found together with high order multipole moments featuring non-zero overall far-field. In this paper, we theoretically and experimentally demonstrate a fully non-scattering state governed by a novel 4-fold hybrid anapole with all the dominant multipoles suppressed by their corresponding toroidal (retarded) terms, i.e. a dark analogue of the superscattering effect. This invisibility state, however, allows for non-trivial near-field maps enabled by the unique interplay of the resonant Mie-like and Fabry-Perot modes as demonstrated by the quasi-normal modal expansion. Moreover, the hybrid anapole state is shown to be protected; the spectral position of the non-scattering point remains unperturbed in the presence of a substrate with significantly high refractive index. We experimentally verify our novel effect by means of dark field measurements of the scattering response of individual nanocylinders. The results are of high demand for efficient sensing and Raman scattering setups with enhanced signal-to-noise ratio, highly transmissive metasurfaces for phase manipulation, holograms, and a large span of linear and non-linear applications in dielectric nanophotonics.