The generalized Kerker effect (GKE) arising from the interference of high-order multipoles has attracted more interest due to its direct correlation with various functionalities in nanophotonics. The realization of the GKE at oblique incidence is highly desired yet remains underexplored. Herein, we report the experimental observation of the GKE by leveraging quasi-bound states in the continuum (QBICs) supported by a silicon metasurface. The low-Q leaky mode resonance interacts with one of the high-Q QBICs under oblique incidence, leading to the formation of a hybrid magnetic quadrupole (MQ)–magnetic dipole (MD) mode. The amplitude of the hybrid MQ–MD mode can be precisely controlled to achieve an out-of-phase condition by varying the incident angle, resulting in a GKE under the second Kerker condition. Our results reveal that the QBICs associated with rich multipole resonances can provide a new paradigm for tailoring the GKE, suggesting important implications for advanced metadevices.

中文翻译：

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观察连续体中准束缚态介导的广义 Kerker 效应


由高阶多极子干扰引起的广义 Kerker 效应 （GKE） 因其与纳米光子学中的各种功能直接相关而引起了更多关注。在斜入射时实现 GKE 是非常理想的，但仍然没有得到充分的探索。在此，我们报告了通过利用硅超表面支持的连续体中的准束缚态 （QBIC） 对 GKE 的实验观察。低 Q 泄漏模式谐振在斜入射下与其中一个高 Q QBIC 相互作用，导致形成混合磁四极子 （MQ）-磁偶极子 （MD） 模式。混合 MQ-MD 模式的振幅可以精确控制，通过改变入射角来实现异相条件，从而在第二 Kerker 条件下产生 GKE。我们的结果表明，与丰富的多极谐振相关的 QBIC 可以为定制 GKE 提供一种新的范式，这对先进的超器件具有重要意义。