Volume 15 Issue 4
Jul.  2022
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HE Zhen, ZHUO Li-qiang, LI Zhi, ZHUANG Feng-jiang, SU Shao-jian, LIN Zhi-li, QIU Wei-bin. Slow light in graphene plasmonic time crystals[J]. Chinese Optics, 2022, 15(4): 845-861. doi: 10.37188/CO.2021-0201
Citation: HE Zhen, ZHUO Li-qiang, LI Zhi, ZHUANG Feng-jiang, SU Shao-jian, LIN Zhi-li, QIU Wei-bin. Slow light in graphene plasmonic time crystals[J]. Chinese Optics, 2022, 15(4): 845-861. doi: 10.37188/CO.2021-0201

Slow light in graphene plasmonic time crystals

doi: 10.37188/CO.2021-0201
Funds:  Supported by National Natural Science Foundation of China (No. 11774103)
More Information
  • Author Bio:

    HE Zhen (1995—), male, from Ganzhou, Jiangxi Province, a master's degree student, received a bachelor's degree in electronic science and technology from Jingdezhen Ceramic Institute in 2018, mainly engaged in the research of photonic crystal materials and optical topological insulators

    QIU Weibin (1971—), male, born in Fujian Province, Ph.D., professor, received his Ph.D. in microelectronics and solid-state electronics and specialty from Institute of Semiconductors, Chinese Academy of Sciences, Beijing in 2003, mainly engaged in the research of semiconductor electronic devices, photonic devices, circuits and systems, supramolecules, topology and topological plasmons

  • Corresponding author: wbqiu@hqu.edu.cn
  • Received Date: 18 Nov 2021
  • Rev Recd Date: 16 Dec 2021
  • Available Online: 01 Jun 2022
  • In order to control the group velocity of slow light, a graphene plasmon time crystal slow light waveguide was constructed and used for the waveguide to construct the Zigzag topology interface channel for transmission. When the structure is fixed, the external bias voltage of the graphene nano-disk can be dynamically adjusted to obtain the dispersion curves at different times. The corresponding group velocity is studied. First, the graphene plasmon time crystal is obtained by applying the bias voltages periodically varying with time to different regions of the honeycomb arranged graphene nano-disks. When the time translation symmetry of the crystal is destroyed, the crystal band gap will periodically appear and disappear with time, and exhibit the band topology effect. The Zigzag topology interface is constructed to analyze the topological interface state and its slow light mode existing at different moments. Then the corresponding group velocity is calculated according to the dispersion curve. Finally, a slow light waveguide model is established through numerical simulation, and the field enhancement process is detected at the light energy capture point of the waveguide. Simulation results show that the waveguide designed based on the graphene plasmon time crystal can achieve a good slow light transmission effect, and the group velocity of the light can be dynamically adjusted when the waveguide structure is fixed. Under slow light transmission, the light energy capture point realizes the field enhancement effect. The slow light waveguide with simple structure can be dynamically tuned, and has broad application prospects in slow light modulation devices and optical storage devices.

     

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