论文标题
拓扑界面状态在聚合物 - 色脂液晶超级晶格中
Topological Interface-State Lasing in a Polymer-Cholesteric Liquid Crystal Superlattice
论文作者
论文摘要
拓扑光子学的发展预示着操纵光以及新型光子设备（例如拓扑绝缘体激光器）的革命。在这里，我们展示了在可见的波长状态下可调的聚合物 - 色液液晶（P-CLC）超晶格中圆极化的拓扑激光。通过使用飞秒激光直接撰写和自组装技术，我们建立了具有受控的迷你带结构和拓扑界面缺陷的P-CLC超晶格，从而达到了低约0.4 UJ的可靠拓扑激光的低阈值。由于手性液晶，不仅对发射波长进行了热调节，而且很容易实现圆形极化激光。我们的结果带来了以低成本实现紧凑和集成的拓扑光子设备的可能性，并为探索涉及软性环境中轻度互动的拓扑物理学的理想平台设计。
The advance of topological photonics has heralded a revolution for manipulating light as well as for the development of novel photonic devices such as topological insulator lasers. Here, we demonstrate topological lasing of circular polarization in a polymer-cholesteric liquid crystal (P-CLC) superlattice, tunable in the visible wavelength regime. By use of the femtosecond-laser direct-writing and self-assembling techniques, we establish the P-CLC superlattice with a controlled mini-band structure and a topological interface defect, thereby achieving a low threshold for robust topological lasing at about 0.4 uJ. Thanks to the chiral liquid crystal, not only the emission wavelength is thermally tuned, but the circularly polarized lasing is readily achieved. Our results bring about the possibility to realize compact and integrated topological photonic devices at low cost, as well as to engineer an ideal platform for exploring topological physics that involves light-matter interaction in soft-matter environments.
