论文标题
共鸣的不对称全dielectric跨表面，用于增强第三次谐波一代
Resonant Asymmetric All-Dielectric Metasurface for Boosting Third-Harmonic Generation
论文作者
论文摘要
共振元素由于其鲜明的光谱特征和非凡的田间增强而受到了广泛的关注。在这项工作中，通过打破硅纳米柱的平面对称性，我们实现了尖锐的Fano共振。计算并分析跨场辐射和近场分布，以进一步揭示跨侧面的谐振性能。此外，理论推导和模拟表现出Q因子对不对称参数的逆二次依赖性，表明共振受到连续体中对称性保护的结合态的控制。最后，我们通过实验证明了尖锐的共鸣，并利用它来效力增强第三次谐波一代。这种增强可以归因于元图内的强光强度增强。
Resonant metasurfaces have received extensive attention due to their sharp spectral feature and extraordinary field enhancement. In this work, by breaking the in-plane symmetry of silicon nanopillars, we achieve a sharp Fano resonance. The far-field radiation and near-field distribution of metasurfaces are calculated and analyzed to further uncover the resonant performance of metasurfaces. Moreover, the theoretical derivation and simulation exhibit an inverse quadratic dependence of Q-factors on asymmetry parameters, revealing that the resonance is governed by the symmetry-protected bound states in the continuum. Finally we experimentally demonstrate the sharp resonance, and employ it to effciently boost the third-harmonic generation. This enhancement can be attributed to the strong optical intensity enhancement inside the metasurface.
