the Central South University of Forestry and Technology [2021YJ0056]; Central South University of Forestry and Technology [11404410]; National Natural Science Foundation of China [2020JJ4935]; Natural Science Foundation of Hunan Province [20B602, 21B0253]; Research Foundation of the Education Bureau of Hunan Province
机构署名：
本校为通讯机构
院系归属：
理学院
摘要：
A switchable enhancement group delay in the terahertz band based on a novel sandwich topology protection structure with graphene is proposed in this paper. The notable phase transition of the reflected beam comes from the topological edge-protected mode excited at the sandwich photonic crystal surface, and the non-trivial topology of the photonic crystal allows the structure to be immune against defects and imperfections, which lays the foundation for the enhancement of group delay in the terahertz band. And the introduction of graphene creates favorable conditions for the reversible switching...
