Tunable plasmon-induced transparency based on asymmetric H-shaped graphene metamaterials

作     者：Yu-Chen Tian Wei Jia Pei-Wen Ren Chun-Zhen Fan 田雨宸;贾微;任佩雯;范春珍

作者机构：School of Physical Science and Engineering Zhengzhou University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2018年第27卷第12期

页      面：297-303页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Project supported by the Key Science and Technology Research Project of Henan Province,China(Grant Nos.162102210164 and 1721023100107) the Natural Science Foundation of Henan Educational Committee,China(Grant No.17A140002) 

主　　题：plasmon-induced transparency graphene polarization optical filter 

摘      要：We propose and numerically demonstrate a tunable plasmon-induced transparency(PIT) phenomenon based on asymmetric H-shaped graphene metamaterials. The tunable PIT effect is realized through varying the applied polarization angles rather than changing the structure geometry. By simply adjusting the polarization angle, the transmission spectra can be controlled between the switch-on state and switch-off state. The physical mechanism of the induced transparency is revealed from magnetic dipole inductive coupling and phase coupling. Importantly, by varying the Fermi energy of the graphene or the refractive index of the substrate, the resonant position of the PIT can be dynamically controlled and the maximum modulation depths can reach up to 60.7%. The sensitivity(nm/RIU) of the graphene structure, which is the shift of resonance wavelength per unit change of refractive index, is 5619.56 nm/RIU. Moreover, we also extend our research to the x-axis symmetric H-shaped structure, and the tunable PIT transmission window can also be realized. The physical mechanism of the induced transparency is revealed from the electric dipole hybridization coupling. Our designed H-shaped graphene-based structures is a promising candidate for compact elements such as tunable sensors, switches and slow-light devices.