arXiv 2602.096142026-02-10physics.optics

亚波长光栅环谐振器中横向光学自旋的出现

Emergence of transverse optical spin in a subwavelength grating ring resonator

ITMO University（ITMO大学）；Harbin Engineering University（哈尔滨工程大学）

Nikita Iukhtanov, Chao Sun, Georgiy Kurganov, Dmitry Zhirihin, Andrey Bogdanov, Roman Savelev

备注：: 16 pages, 10 figures

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AI总结：

亚波长光栅环谐振器通过模式耦合实现非零横向光学自旋，实验验证其高达70%的圆极化度，为芯片级光学自旋电子和谷电子接口提供新方法。

摘要：

电磁场的局部极化在光与自旋和谷极化量子源的相互作用中起着至关重要的作用。不同于自由空间电磁波，其极化退化性使极化操控具有灵活性，而平面集成光学结构由于内在的结构各向异性缺乏这种自由度。本文提出了一种基于亚波长光栅波导的平面光学环谐振器，该波导支持两个近退化的模式。我们证明了这些模式在环谐振器中的耦合导致在谐振器附近形成具有电场旋转主导方向的谐振，从而产生非零的横向光学自旋。所提出结构的平均圆极化度达到高达70%的值。理论预测通过在微波频段的实验验证得到证实。我们的发现表明，实现芯片级光学自旋电子和谷电子接口提供了一条可行的途径。

英文摘要：

The local polarization of the electromagnetic field plays a crucial role in the interaction of light with spin- and valley-polarized quantum sources. Unlike free-space electromagnetic waves, whose polarization degeneracy enables flexible polarization manipulation, planar integrated optical structures lack such degree of freedom owing to intrinsic structural anisotropy. Here, we propose a planar optical ring resonator based on a subwavelength grating waveguide that supports two quasi-degenerate modes. We demonstrate that coupling of these modes in the ring resonator leads to the formation of the resonances with a predominant direction of electric-field rotation in the vicinity of the resonator, resulting in the non-zero transverse optical spin. The average degree of circular polarization in the proposed structures reaches values of up to 70%. The theoretical predictions are corroborated by experimental validation in the microwave spectral range. Our findings suggest a viable route toward realization of on-chip optical spintronic and valleytronic interfaces.

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