量子光学学报, 2018, 24 (1): 74, 网络出版: 2018-09-06  

基于石墨烯的光波导结构中的等离子体诱导透明研究

Research of Plasmon Induced Transparency in Graphene-based Waveguide Structure
作者单位
1 山西大学 物理电子工程学院, 山西 太原 030006
2 山西大学 现代教育技术学院, 山西 太原 030006
3 山西大学 物理电子工程学院, 山西 太原 030006:
摘要
本文提出了两种新型的基于石墨烯的表面等离子体光波导(GSPW),结构由单层石墨烯直波导与侧耦合的石墨烯环形谐振腔和条形谐振腔构成,利用有限元法(finite element method, FEM)对GSPW中呈现出的等离子体诱导透明(plasmon induced transparency, PIT)现象及其慢光效应进行了研究,结果表明,传输谱中出现的PIT透明窗口峰值传输率可达到80%以上,而其两侧的传输谷值接近于0,并且PIT峰值附近的最大群折射率在112左右,具有很好的滤波特性与慢光特性。透明窗口在不改变几何结构的情况下还可通过石墨烯化学势的改变而动态调制,因此,该结构在今后基于石墨烯的高密度集成表面等离子体光波导器件的设计中具有重要的借鉴作用。
Abstract
Two novel plasmonic waveguides based on graphene (GSPW) material are proposed. The GSPW is comprised of a graphene bus waveguide side-coupled with a graphene ring resonator and a graphene strip resonator. The plasmon induced transparency phenomenon and slow-light effect are researched based on the finite element method (FEM). Simulation results show that the peak transmission rate of the transparent window appeared in the transmission spectrum exceeds 80% with its left and right dip transmission rates close to zero. Meanwhile, the maximal group index in the vicinity of the PIT peak is about 112. The results prove that good performances of filtering and slow light can be obtained based on the proposed structure. Furthermore, the transmission characteristics can be dynamically tuned by the chemical potential of the graphene without rebuilding the device structures. The proposed waveguides pave a new way for the compact integration for graphene-based waveguide.

吴晓婷, 田晋平, 杨荣草. 基于石墨烯的光波导结构中的等离子体诱导透明研究[J]. 量子光学学报, 2018, 24(1): 74. WU Xiao-ting, TIAN Jin-ping, YANG Rong-cao. Research of Plasmon Induced Transparency in Graphene-based Waveguide Structure[J]. Acta Sinica Quantum Optica, 2018, 24(1): 74.

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