基于T型石墨烯超材料可调电磁诱导透明效应  

Tunable electromagnetically induced transparency based on T-shaped graphene metamaterials

作　　者：曹妍妍[1,2] 李悦[1,2] 刘元忠[1,2] 张玉萍[1,2] 张会云[1,2] CAO Yanyan;LI Yue;LIU Yuanzhong;ZHANG Yuping;ZHANG Huiyun

机构地区：[1]山东科技大学电子通信与物理学院,山东青岛266510 [2]山东科技大学青岛市太赫兹技术重点实验室,山东青岛266510

出　　处：《太赫兹科学与电子信息学报》2017年第2期192-197,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：山东省自然科学基金资助项目(ZR2012FM011);青岛市创新领军人才项目(13-CX-25);中国工程物理研究院太赫兹科学技术基金资助项目(201401);青岛经济技术开发区重点科技计划资助项目(2013-1-64);山东科技大学基金资助项目(SDKDYC170235);国家留学基金资助项目

摘　　要：基于石墨烯电导率的可调性,设计了T型石墨烯纳米超材料结构,实现对电磁诱导透明(EIT)效应的动态调谐。研究发现,当2个石墨烯条互相靠近时,由于二者间存在较强耦合,发生相消干涉,因此出现透明窗口。同时讨论了石墨烯条长度、缝宽、入射偏振角等几何参数对EIT效应的影响。研究结果表明,耦合强度随着缝宽的增加而减弱;随着入射偏振角的增加也呈现减弱趋势;随着石墨烯条长度的增加,透明窗口发生红移现象,且第一个下降峰强度明显增加。此外,当费米能级由0.3 e V增加到0.9 e V时,共振频率由24 THz蓝移至35 THz,且强度增强,证实了改变石墨烯的费米能级,能够调节透明窗口的位置。并且透明窗口附近有明显的群速度延迟(0.05 ps左右),即可以实现对光速的减慢。A tunable graphene nanostructure metamaterial is designed in order to obtain the Electromagnetically Induced Transparency(EIT)which is analogs to the atomic EIT.By placing the light mode and dark mode closer,a transparency window is shaped due to the strong coupling between them.Meanwhile,the effects of gap size,strip length,coupling location,incident polarization angle and refractive index on the EIT phenomenon are investigated.The results show that the coupling strength becomes weaker as the width of gap increases,and a second window occurs when the dark mode shifts away from the center of the light mode.In addition,changing the Fermi energy of the graphene could bring a different transparency window as well as a tunable group delay.This work may provide applications in the field of photonics,biological sensing and slow light devices.

关 键 词：石墨烯 超材料 电磁诱导透明 

分 类 号：TQ127.11[化学工程—无机化工]