Experimental observation of multiple edge and corner states in photonic slabs heterostructures  

作　　者：MINGXING LI YUEKE WANG TIAN SANG HONGCHEN CHU YUN LAI GUOFENG YANG 

机构地区：[1]Optical Information Science and Technology Department,Jiangnan University,Wuxi 214122,China [2]Optoelectronic Engineering and Technology Research Center,Jiangnan University,Wuxi 214122,China [3]National Laboratory of Solid State Microstructures,School of Physics,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Photonics Research》2022年第1期197-204,共8页光子学研究（英文版）

基　　金：Jiangsu Provincial Key Research and Development Program(BE2020756);National Natural Science Foundation of China(1148081606193050)。

摘　　要：The photonic topological insulator has become an important research topic with a wide range of applications.Especially the higher-order topological insulator,which possesses gapped edge states and corner or hinge states in the gap,provides a new scheme for the control of light in a hierarchy of dimensions.In this paper,we propose a heterostructure composed of ordinary-topological-ordinary(OTO)photonic crystal slabs.Two coupled edge states(CESs)are generated due to the coupling between the topological edge states of the ordinary-topological interfaces,which opens up an effective way for high-capacity photonic transport.In addition,we obtain a new band gap between the CESs,and the two kinds of coupled corner states(CCSs)appear in the OTO bend structure.In addition,the topological corner state is also found,which arises from the filling anomaly of a lattice.Compared with the previous topological photonic crystal based on C-4 lattice,CESs,CCSs,and the topological corner state are all directly observed in experiment by using the near-field scanning technique,which makes the manipulation of the electromagnetic wave more flexible.We also verify that the three corner states are all robust to defects.Our work opens up a new way for guiding and trapping the light flow and provides a useful case for the coupling of topological photonic states.

关 键 词：ordinary HAS CORNER 

分 类 号：O469[理学—凝聚态物理]