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Optical isolation induced by subwavelength spinning particle via spin-orbit interaction.
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论文类型：期刊论文
发表刊物：Physical Review B
所属单位：光电学院，国家光电研究中心
刊物所在地：美国
学科门类：物理学
项目来源：自然科学基金
文献类型：J
卷号：103
期号：9
关键字：无
DOI码：10.1103/PhysRevB.103.094105
发表时间：2021-03-02
教研室：c716
摘要：Optical isolation enables nonreciprocal manipulations of light with broad applications in optical communications. Optical isolation by rotating structures has drawn considerable attention due to its magnetic-free nature and unprecedented performance. Conventional rotation-based optical isolation relies on the use of bulky cavities hindering applications in subwavelength photonics. Here, we propose a mechanism of optical isolation by integrating the unique dispersion of a hyperbolic metamaterial with the transverse spin-orbit interaction of evanescent waves. We show that rotation of a subwavelength hyperbolic nanoparticle breaks the time-reversal symmetry and yields two resonant chiral modes that selectively couple to the transverse spin of waveguide modes. Remarkably, the transverse spin-orbit interaction can give rise to unidirectional coupling and more than 95% isolation of infrared light at an experimentally feasible rotation speed. Our work fuses the two important fields of optical isolation and photonic spin-orbit interactions, leading to magnetic-free yet compact nonreciprocal devices for applications in optical communications, chiral quantum optics, and topological photonics.
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