Opt Express. 2022 Mar 28;30(7):10792-10801. doi: 10.1364/OE.443907.
In the development of integrated sensing, how to reduce losses and improve robustness has always been one of the key problems to be solved. The topological photonic crystal structure based on the quantum Hall effect has gradually attracted the attention of researchers due to its unique immune defect performance and anti-scattering performance. Here, we have successfully applied the valley photonic crystal structures to topologically manipulate the light within the band gap of 252 THz-317 THz in a silicon-on-insulator platform. We experimentally demonstrated that satisfactory transmission performance can be obtained using the valley-dependent topological edge states below light cone, even if there are structure defects such as lattice missing and lattice mistake near the interface between two kinds VPCs. Based on the features of topological protection, a triangular cavity consisting of three 10×a-length sides is proposed, and the Q factor value reaches 1.83×10 with little influence from defects. Finally, based on drying etching technology, a biosensor with cavity-coupled waveguide structure was prepared, and the RI sensitivity was 1228 nm/RIU.
在集成传感的发展中，如何降低损耗和提高鲁棒性一直是需要解决的关键问题之一。基于量子霍尔效应的拓扑光子晶体结构由于其独特的免疫缺陷性能和抗散射性能，逐渐引起了研究人员的关注。在这里，我们成功地将谷光子晶体结构应用于在绝缘体上硅平台中的 252 THz-317 THz 带隙内对光进行拓扑操控。我们实验证明，即使在两种 VPC 之间的界面附近存在晶格缺失和晶格错误等结构缺陷，也可以使用低于光锥的谷相关拓扑边缘状态获得令人满意的传输性能。基于拓扑保护的特点，提出了一个由三个 10×a 长度边组成的三角形腔，其 Q 值达到 1.83×10，几乎不受缺陷的影响。最后，基于干法刻蚀技术，制备了具有腔耦合波导结构的生物传感器，其 RI 灵敏度为 1228 nm/RIU。
