摘要
The reflected group delay from a multilayer structure comprising a one-dimensional photonic crystal coated with a bulk Dirac semimetal(BDS)separated by a spacer layer is investigated theoretically.It is shown that the group delay of the reflected beam in this structure can be significantly negatively enhanced and switched from negative to positive.The enhanced group delay originates from the steep phase change caused by the excitation of the optical Tamm state at the interface between the BDS and spacer layer.Moreover,positive and negative group delays can be actively tuned through the Fermi energy and the relaxation time of the BDS.We believe that this enhanced and tunable delay scheme has important research significance for the fabrication of optical delay devices.
作者
郑棋文
卢文广
胥加青
叶云洋
赵新民
蒋乐勇
Qiwen Zheng;Wenguang Lu;Jiaqing Xu;Yunyang Ye;Xinmin Zhao;Leyong Jiang(School of Physics and Electronics,Hunan Normal University,Changsha 410081,China;School of Intelligent Manufacturing and Electronic Engineering,Wenzhou University of Technology,Wenzhou 325035,China;School of Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China)
基金
Project supported by the Scientific research project of Zhejiang Provincial Department of Education(Grant No.Y202250547)
the Scientific Research Project ofWenzhou University of Technology(Grant No.ky202205)
the Hunan Provincial Natural Science Foundation of China(Grant No.2022JJ30394).
