中国物理B ›› 2020, Vol. 29 ›› Issue (8): 84211-084211.doi: 10.1088/1674-1056/ab9df1

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇    下一篇

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

Bo-Yun Wang(王波云), Yue-Hong Zhu(朱月红), Jing Zhang(张静), Qing-Dong Zeng(曾庆栋), Jun Du(杜君), Tao Wang(王涛), Hua-Qing Yu(余华清)   

  1. 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
  • 收稿日期:2020-04-06 修回日期:2020-05-07 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Bo-Yun Wang, Bo-Yun Wang E-mail:wangboyun913@126.com;yuhuaqing@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11647122 and 61705064) and the Natural Science Foundation of Hubei Province, China (Grant Nos. 2018CFB672 and 2018CFB773).

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

Bo-Yun Wang(王波云)1, Yue-Hong Zhu(朱月红)1, Jing Zhang(张静)1, Qing-Dong Zeng(曾庆栋)1, Jun Du(杜君)1, Tao Wang(王涛)2, Hua-Qing Yu(余华清)1   

  1. 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
  • Received:2020-04-06 Revised:2020-05-07 Online:2020-08-05 Published:2020-08-05
  • Contact: Bo-Yun Wang, Bo-Yun Wang E-mail:wangboyun913@126.com;yuhuaqing@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11647122 and 61705064) and 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/cm2 to 2.05 MW/cm2. 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/cm2 to 11.76 MW/cm2. 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 0.8 μm2. 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

Abstract: 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/cm2 to 2.05 MW/cm2. 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/cm2 to 11.76 MW/cm2. 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 0.8 μm2. 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.

Key words: slow light, plasmon-induced transparency (PIT), graphene, plasmonic waveguide

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
42.15.Eq (Optical system design) 42.65.Wi (Nonlinear waveguides) 81.05.ue (Graphene)