基于石墨烯超表面的可调谐慢光特性研究  

Tunable Slow Light Performance Based on Graphene Metasurface

作　　者：马毅 郭靖宇 陈麟[1,2] Ma Yi;Guo Jingyu;Chen Lin(School of Optical Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Modern Optical Systems,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息科学与计算机工程学院,上海200093 [2]上海市现代光学系统重点实验室,上海200093

出　　处：《光学学报》2023年第16期356-364,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61988102,62275157);上海市教育发展基金会“曙光计划”(18SG44);高等学校学科创新引智计划(D18014)。

摘　　要：基于金属-石墨烯耦合的开口谐振环超材料,在0.8~1.2 THz范围成功实现等离诱导透明效应(PIT)。通过调节石墨烯的费米能级可以在0.929 THz和1.037 THz处实现振幅调制,最大调制深度分别为96.05%和65.40%。通过提出等效电容耦合结构来量化偏置电压与石墨烯费米能级的关系,该结构在慢光应用的研究结果表明,当偏置电压为30 V,石墨烯宽度为2μm时,群延时、群折射率、延时带宽积和Q值分别可达93.12 ps,756.67,9.31,10.19。该研究结果对可调谐慢光器件的应用具有潜在的推动作用。Objective Plasmon-induced transparency(PIT)refers to an atypical transmission phenomenon that results from the coupling of various resonance modes with the near-field electromagnetic wave.This usually results in a slowdown of the speed of light at the transmission peak due to significant dispersion,which is known as slow light performance.Numerous studies have demonstrated that slow light performance can be achieved in optical fibers,waveguides,and metasurfaces,which has led to wide-ranging applications in areas such as optical storage and optical modulation.Metasurfaces offer several advantages over optical fibers and waveguides,including small size,ease of fabrication,and excellent electromagnetic properties.Moreover,the addition of graphene to metasurfaces provides high-quality properties such as high transmittance,low loss,and dynamical adjustability.As a result,graphene-based metasurfaces hold significant potential in the study of slow light performance.However,the production and utilization of complex patterned graphene are limited by the current state of nanomanufacturing technology.Therefore,studying the PIT effect in simple structures with high quality is crucial for the practical production and application of PIT devices in experiments and real-life settings.Moreover,designing simple and manufacturable structures that produce high-quality multi-mode PIT is of great significance to optical device fabrication.This will significantly promote the rapid development and application of photonic devices based on the PIT effect.Methods In this paper,we investigate the PIT effect in monolayer patterned graphene metasurfaces using numerical simulations of the electromagnetic field.The simulations are performed using the full-wave electromagnetic software,namely CST Microwave Studio 2019,which utilizes the finite integration technique(FIT)to solve the discrete Maxwell equations.The metasurface structure consists of a split ring resonator(SRR)laterally coupled by metal-graphene-metal.Initially,we analyze the transmi

关 键 词：等离诱导透明 石墨烯 可调谐 慢光效应 太赫兹 

分 类 号：O439[机械工程—光学工程]