Visible-infrared-terahertz optical modulation of few-layer graphene through lithium intercalation  

作　　者：Ganying Zeng Zhenyu Fang Weibao He Zixuan Wang Yijie Li Liantuan Xiao Suotang Jia Chengbing Qin Renyan Zhang 曾干英;方振宇;何韦宝;王孜炫;李怡洁;肖连团;贾锁堂;秦成兵;张仁彦(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [3]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Optics Letters》2024年第9期108-113,共6页中国光学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFA1404201);the National Natural Science Foundation of China(Nos.62305200,U22A2091,62127817,and 62075240);the Fundamental Research Program of Shanxi Province(No.202203021222001).

摘　　要：Optical modulation is significant and ubiquitous to telecommunication technologies,smart windows,and military devices.However,due to the limited tunability of traditional doping,achieving broadband optical property change is a tough problem.Here,we demonstrate a remarkable transformation of optical transmittance in few-layer graphene(FLG)covering the electromagnetic spectra from the visible to the terahertz wave after lithium(Li)intercalation.It results in the transmittance being higher than 90%from the wavelengths of 480 to 1040 nm,and it increases most from 86.4%to 94.1%at 600 nm,reduces from∼80%to∼68%in the wavelength range from 2.5 to 11μm,has∼20%reduction over a wavelength range from 0.4 to 1.2 THz,and reduces from 97.2%to 68.2%at the wavelength of 1.2 THz.The optical modification of lithiated FLG is attributed to the increase of Fermi energy(E_(f))due to the charge transfer from Li to graphene layers.Our results may provide a new strategy for the design of broadband optical modulation devices.

关 键 词：few-layer graphene INTERCALATION LiC_(12) optical modulation charge transfer 

分 类 号：O441.4[理学—电磁学] TN761[理学—物理]