Topologically enabled ultrahigh-Q guided resonances robust to out-of-plane scattering
Topologically enabled ultrahigh-Q guided resonances robust to out-of-plane scattering
复制标题
拓扑启用超高 Q 引导共振，对面外散射具有鲁棒性
DOI：
10.1038/s41586-019-1664-7
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发表时间：
2019-10-24
期刊：
影响因子：
64.8
通讯作者：
Peng, Chao
中科院分区：
文献类型：
--
作者：
Jin, Jicheng;Yin, Xuefan;Peng, Chao
由于其限制光的能力，光学谐振器（1-3）对于科学和技术非常重要，但是其性能通常受到由不可避免的制造缺陷（4，5）引起的面外散射损耗的限制。在这里，我们从理论上提出并实验证明了一类在光子晶体板的引导共振，其中的平面外散射损耗被强烈抑制其拓扑性质。当连续介质中的多个束缚态--每个束缚态都携带一个拓扑电荷（6）--在动量空间中合并并增强同一频带中所有附近共振的品质因子Q时，这些共振就会出现。在电信领域使用这样的共振，我们在实验中实现了高达4.9 x 10（5）的品质因数，比标准设计高出12倍，并且这种增强对我们所有的样品都保持稳定。我们的工作铺平了道路，为未来的探索拓扑光子学的系统与开放的边界条件，并为他们的应用，以改善光电器件的光子集成电路。
Because of their ability to confine light, optical resonators(1-3) are of great importance to science and technology, but their performance is often limited by out-of-plane-scattering losses caused by inevitable fabrication imperfections(4,5). Here we theoretically propose and experimentally demonstrate a class of guided resonances in photonic crystal slabs, in which out-of-plane-scattering losses are strongly suppressed by their topological nature. These resonances arise when multiple bound states in the continuum-each carrying a topological charge(6)-merge in momentum space and enhance the quality factors Q of all nearby resonances in the same band. Using such resonances in the telecommunication regime, we experimentally achieve quality factors as high as 4.9 x 10(5)-12 times higher than those obtained with standard designs-and this enhancement remains robust for all of our samples. Our work paves the way for future explorations of topological photonics in systems with open boundary conditions and for their application to the improvement of optoelectronic devices in photonic integrated circuits.