Zhang Zhenbin, Ruan Banxian, Gao Enduo, Liu Chao, Li Hongjian
Opt Lett. 2024 Apr 1;49(7):1782-1785. doi: 10.1364/OL.517816.
In the field of optics, bound states in the continuum (BICs) are of significant practical importance as they can trap electromagnetic waves spatially, even though their frequency lies within the continuous spectrum. Previous research, however, has shown that BICs localized in optical cavities are highly sensitive to geometric and environmental changes. This sensitivity implies that slight variations can lead to the loss of BICs, necessitating extreme precision in manufacturing, which poses a challenge for practical implementation. To overcome this issue, this study employs topological photonic crystals (PhCs) to engineer topological corner states (TCS) within PhCs. By doing so, it establishes a method for creating topological BICs that are inherently robust against disturbances, thereby enhancing their suitability for real-world applications.
在光学领域，连续谱中的束缚态（BICs）具有重要的实际意义，因为它们能够在空间上捕获电磁波，即使其频率位于连续谱范围内。然而，先前的研究表明，局限于光学腔中的BICs对几何和环境变化高度敏感。这种敏感性意味着微小的变化可能导致BICs的丧失，这就要求制造过程具有极高的精度，这对实际应用构成了挑战。为了克服这个问题，本研究采用拓扑光子晶体（PhCs）来设计光子晶体内的拓扑角态（TCS）。通过这样做，建立了一种创建对干扰具有固有鲁棒性的拓扑BICs的方法，从而提高了它们在实际应用中的适用性。
