Dielectric metasurfaces supporting symmetry-protected bound states in the continuum (SP-BICs) have emerged as an attractive platform for manipulating light–matter interactions on the nanoscale. However, quasi-BIC with a high quality factor (Q-factor) by releasing SP-BIC is still a challenge in practice due to the Q-factor sensitivity to asymmetric parameters and the limited level of fabrication. Here, we present a universal perspective aiming at achieving high-Q-factor quasi-BICs through the efficient perturbation of eigenfields. This approach affords the flexibility to select scaling laws of the Q-factor, and a larger Q-factor can be obtained under the disturbance of the weak field region for the same asymmetric parameters. Such findings have been extended to classical nanostructures, such as dimeric nanobars, splitting rings, and nanodisks. Finally, square nanodisks embedded with air holes at different positions are used as an example to experimentally confirm our findings. Our method provides a new idea for the release of high-Q-factor quasi-BICs and paves the way for the realization of high-performance optical devices based on a high Q-factor.

中文翻译：

---

本征场的选择性扰动可实现介电超表面连续体中的高 Q 准束缚态


支持连续体中对称保护束缚态的介电超表面（SP-BIC）已成为在纳米尺度上操纵光与物质相互作用的一个有吸引力的平台。然而，由于Q因子对不对称参数的敏感性以及有限的制造水平，通过释放SP-BIC来实现具有高品质因子（Q因子）的准BIC在实践中仍然是一个挑战。在这里，我们提出了一个普遍的观点，旨在通过特征场的有效扰动来实现高 Q 因子准 BIC。该方法提供了选择Q因子缩放法则的灵活性，并且对于相同的非对称参数，在弱场区域的扰动下可以获得更大的Q因子。这些发现已扩展到经典纳米结构，例如二聚纳米棒、分裂环和纳米盘。最后，以在不同位置嵌入气孔的方形纳米盘为例，通过实验证实了我们的发现。我们的方法为高Q值准BIC的发布提供了新的思路，并为实现基于高Q值的高性能光器件铺平了道路。