You Shaojun, He Haoxuan, Zhang Ying, Duan Hong, Wang Lulu, Wang Yiyuan, Luo Shengyun, Zhou Chaobiao
School of Physics and Mechatronic Engineering, Guizhou Minzu University, Guiyang 550025, China.
School of Materials Science and Engineering, Guizhou Minzu University, Guiyang 550025, China.
Nano Lett. 2024 Dec 4;24(48):15300-15307. doi: 10.1021/acs.nanolett.4c04217. Epub 2024 Nov 6.
Dielectric metasurface supported symmetry-protected bound states in the continuum (SP-BIC) provide an important platform for enhancing light-matter interactions. However, the conversion of SP-BIC into quasi-BIC (QBICs) through symmetry breaking is often accompanied by a shift in the resonance wavelength. In this work, we present a generalized viewpoint aimed at achieving the wavelength stability of QBICs through symmetry breaking and area compensation (SBAC). Three SBAC schemes we propose are equal proportional compensation along both - and -directions and equal proportional compensation along -direction only or -direction only. The QBICs resonance wavelengths stabilized at about 1200, 1520, and 1434 nm are achieved in monomer, dimer, and tetramer metasurfaces, respectively. Finally, we perform an experimental demonstration in a nanohole dimer photonic crystal slab. The QBICs resonance wavelength stabilized at 1658 nm for SBAC. Our approach provides new routes for realizing QBICs with a stable wavelength and tunable Q-factor.
介质超表面支持的连续域中的对称保护束缚态（SP - BIC）为增强光与物质相互作用提供了一个重要平台。然而，通过对称性破缺将SP - BIC转换为准BIC（QBIC）通常伴随着共振波长的偏移。在这项工作中，我们提出了一种广义观点，旨在通过对称性破缺和面积补偿（SBAC）实现QBIC的波长稳定性。我们提出的三种SBAC方案分别是沿x和y方向的等比例补偿、仅沿x方向的等比例补偿或仅沿y方向的等比例补偿。在单体、二聚体和四聚体超表面中分别实现了稳定在约1200、1520和1434 nm的QBIC共振波长。最后，我们在纳米孔二聚体光子晶体平板中进行了实验演示。对于SBAC，QBIC共振波长稳定在1658 nm。我们的方法为实现具有稳定波长和可调Q因子的QBIC提供了新途径。
