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
Study on Polarization-Independent Exciton-Polaritons Based on Mirror-Coupled Quasi-Bound States in the Continuum
摘要: 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。
Abstract: 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.
文章引用：常思源, 张玲珑. 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[J]. 应用物理, 2026, 16(5): 565-577. https://doi.org/10.12677/app.2026.165052

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