Sun Haocheng, Yuan Shuai, Feng Chen, Zhang Jing, Zeng Cheng, Xia Jinsong
Appl Opt. 2022 Oct 1;61(28):8527-8532. doi: 10.1364/AO.471587.
Bound states in the continuum (BICs) are perfectly confined resonances within the radiation continuum. The novel characteristics of single BICs have been studied in great detail in various wave systems, including electromagnetic waves, acoustic waves, water waves, and elastic waves in solids. In practice, the performance of BICs is limited by the finite size of the structure, while the combination of multiple BICs can further improve the localization of resonances. In this study, we experimentally demonstrate the combination of Fabry-Perot and symmetry-protected BICs at near infrared wavelengths by employing a compound photonic crystal system composed of a photonic crystal slab and a distributed Bragg reflector, resulting in an enhanced high quality factor.
连续域束缚态（BICs）是辐射连续谱内完美受限的共振态。单个BICs的新奇特性已在各种波动系统中得到了深入研究，这些系统包括电磁波、声波、水波以及固体中的弹性波。在实际应用中，BICs的性能受到结构有限尺寸的限制，而多个BICs的组合可以进一步提高共振的局域化程度。在本研究中，我们通过采用由光子晶体平板和分布式布拉格反射器组成的复合光子晶体系统，在近红外波长下通过实验证明了法布里-珀罗（Fabry-Perot）和对称保护BICs的组合，从而实现了更高的品质因数。
