Spin Hall Effect of Light via Momentum-Space Topological Vortices around Bound States in the Continuum,Physical Review Letters

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Spin Hall Effect of Light via Momentum-Space Topological Vortices around Bound States in the Continuum
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-30 , DOI: 10.1103/physrevlett.129.236101
Jiajun Wang ₁ , Lei Shi _{1,

2,

3} , Jian Zi _{1,

2,

3}

Affiliation

Optical bound states in the continuum (BICs) are exotic topological defects in photonic crystal slabs, carrying polarization topological vortices in momentum space. The topological vortex configurations not only topologically protect the infinite radiation lifetime of BICs, but also intrinsically contain many unexploited degrees of freedom for light manipulation originating from BICs. Here, we theoretically propose and experimentally demonstrate the spin Hall effect of light in photonic crystal slabs via momentum-space topological vortices around BICs. The strong spin-orbit interactions of light are induced by using the topological vortices around BICs, introducing both wave-vector-dependent Pancharatnam-Berry phase gradients and cross-polarized resonant phase gradients to the spinning light beam, which lead to spin-dependent in-plane-oblique lateral light beam shifts. Our work reveals intriguing spin-related topological effects around BICs, opening an avenue toward applications of BICs in integrated spin-optical devices and information processing.

中文翻译：

通过连续体中束缚态周围的动量空间拓扑涡旋光的霍尔效应

连续体中的光学束缚态 (BIC) 是光子晶体板中奇异的拓扑缺陷，在动量空间中携带偏振拓扑涡旋。拓扑涡旋配置不仅在拓扑上保护 BIC 的无限辐射寿命，而且本质上还包含许多未开发的自由度，用于源自 BIC 的光操纵。在这里，我们通过 BIC 周围的动量空间拓扑涡从理论上提出并通过实验证明了光在光子晶体板中的自旋霍尔效应。通过使用 BIC 周围的拓扑涡旋，将波矢量相关的 Pancharatnam-Berry 相位梯度和交叉偏振共振相位梯度引入旋转光束，从而引起光的强自旋轨道相互作用，这导致自旋相关的面内倾斜横向光束偏移。我们的工作揭示了 BIC 周围有趣的自旋相关拓扑效应，为 BIC 在集成自旋光学器件和信息处理中的应用开辟了道路。

更新日期：2022-11-30

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