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Applied Physics 2026
基于镜像耦合准连续域束缚态的偏振无关激子极化激元研究
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Abstract:
针对传统对称保护连续域束缚态(BIC)对偏振敏感、鲁棒性较差的局限性，本研究提出一种基于金属镜面耦合的二硫化钨纳米柱阵列超表面，实现了高鲁棒性的镜像耦合准连续域束缚态(QBIC)，并系统探究其与WS2本征激子的强光–物质耦合行为。多极矩分解与近场分析表明，该QBIC模式由磁偶极子主导。由于金属镜面的强电场局域效果，体系实现了高达186.13 meV的拉比分裂能量，证实了激子极化激元的形成。由于该结构不依赖对称破缺且具备旋转对称性，强耦合体系表现出偏振无关特性，并在？20？至20？斜入射范围内保持稳定。进一步，通过控制纳米柱直径，实现了耦合强度的灵活调控，并揭示了近场局域化对强耦合的作用。本工作为非偏振光场下的强光–物质相互作用提供了稳健的调控途径，在低阈值激光器、极化激元器件及非线性光学领域具有重要的应用潜力。
Conventional symmetry-protected bound states in the continuum (BICs) suffer from polarization sensitivity and limited robustness. In this work, we propose a mirror-coupled WS2 nanopillar arrays metasurface, enabling a highly robust mirror-coupled quasi-BICs (QBICs) and systematically investigating the strong light-matter coupling with intrinsic WS2 excitons. Multipole decomposition and near-field analysis reveal that the QBIC mode is dominated by a magnetic dipole resonance. Owing to the strong electric field confinement induced by the metallic mirror, a large Rabi splitting energy of up to 183.65 meV is achieved, confirming the formation of exciton-polaritons. Benefiting from the rotational symmetry of the mirror-coupled structure and its independence from symmetry breaking, the strong coupling system exhibits polarization-insensitive behavior and remains stable under oblique incidence from ？20？ to 20？. Furthermore, by tuning the nanopillar diameter, flexible control of the coupling strength is realized, highlighting the critical role of near-field localization in strong coupling. This work provides a robust strategy for manipulating strong light-matter interactions under unpolarized excitation, with promising applications in low-threshold lasers, polaritonic devices, and nonlinear optics.
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