An ultrafast and low-power slow light tuning mechanism for compact aperture-coupled disk resonators  

作　　者：Bo-Yun Wang Yue-Hong Zhu Jing Zhang Qing-Dong Zeng Jun Du Tao Wang Hua-Qing Yu 王波云;朱月红;张静;曾庆栋;杜君;王涛;余华清(School of Physics and Electronic-information Engineering,Hubei Engineering University,Xiaogan 432000,China;Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]School of Physics and Electronic-information Engineering,Hubei Engineering University,Xiaogan 432000,China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Chinese Physics B》2020年第8期323-332,共10页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.11647122 and 61705064);the Natural Science Foundation of Hubei Province,China(Grant Nos.2018CFB672 and 2018CFB773).

摘　　要：An ultrafast and low-power slow light tuning mechanism based on plasmon-induced transparency(PIT)for two disk cavities aperture-coupled to a metal-dielectric-metal plasmonic waveguide system is investigated numerically and analytically.The optical Kerr effect is enhanced by the local electromagnetic field of surface plasmon polaritons,slow light,and graphene-Ag composite material structures with a large effective Kerr nonlinear coefficient.Through the dynamic adjustment of the frequency of the disk nanocavity,the group velocity is controlled between c/53.2 and c/15.1 with the pump light intensity increased from 0.41 MW/cm^2 to 2.05 MW/cm^2.Alternatively,through the dynamic adjustment of the propagation phase of the plasmonic waveguide,the group velocity is controlled between c/2.8 and c/14.8 with the pump light intensity increased from 5.88 MW/cm^2 to 11.76 MW/cm^2.The phase shift multiplication of the PIT effect is observed.Calculation results indicate that the entire structure is ultracompact and has a footprint of less than 0.8μm^2.An ultrafast responsive time in the order of 1 ps is reached due to the ultrafast carrier relaxation dynamics of graphene.All findings are comprehensively analyzed through finite-difference time-domain simulations and with a coupling-mode equation system.The results can serve as a reference for the design and fabrication of nanoscale integration photonic devices with low power consumption and ultrafast nonlinear responses.

关 键 词：slow light plasmon-induced transparency(PIT) graphene plasmonic waveguide 

分 类 号：TN751.2[电子电信—电路与系统] TN252[一般工业技术—材料科学与工程] TB383.1