中国物理B ›› 2021, Vol. 30 ›› Issue (11): 118702-118702.doi: 10.1088/1674-1056/abfb58

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Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing

Ling Xu(徐玲)1, Yun Shen(沈云)1,†, Liangliang Gu(顾亮亮)2, Yin Li(李寅)1, Xiaohua Deng(邓晓华)3, Zhifu Wei(魏之傅)1, Jianwei Xu(徐建伟)1, and Juncheng Cao(曹俊诚)4   

  1. 1 Department of Physics, Nanchang University, Nanchang 330031, China;
    2 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
    3 Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China;
    4 Shanghai Institute of Microsystem and Information, Chinese Academy of Sciences, Shanghai 200050, China
  • 收稿日期:2021-02-04 修回日期:2021-03-20 接受日期:2021-04-26 出版日期:2021-10-13 发布日期:2021-10-13
  • 通讯作者: Yun Shen E-mail:shenyun@ncu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61865009, 61927813, and 62005168).

Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing

Ling Xu(徐玲)1, Yun Shen(沈云)1,†, Liangliang Gu(顾亮亮)2, Yin Li(李寅)1, Xiaohua Deng(邓晓华)3, Zhifu Wei(魏之傅)1, Jianwei Xu(徐建伟)1, and Juncheng Cao(曹俊诚)4   

  1. 1 Department of Physics, Nanchang University, Nanchang 330031, China;
    2 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
    3 Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China;
    4 Shanghai Institute of Microsystem and Information, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2021-02-04 Revised:2021-03-20 Accepted:2021-04-26 Online:2021-10-13 Published:2021-10-13
  • Contact: Yun Shen E-mail:shenyun@ncu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61865009, 61927813, and 62005168).

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摘要： We propose a terahertz hybrid metamaterial composed of subwavelength metallic slits and graphene plasmonic ribbons for sensing application. This special design can cause the interaction between the plasmon resonances of the metallic slits and graphene ribbons, giving rise to a strong coupling effect and Rabi splitting. Intricate balancing in the strong coupling region can be perturbed by the carrier concentration of graphene, which is subject to the analyte on its surface. Thereby, the detection of analyte can be reflected as a frequency shift of resonance in terahertz transmission spectra. The result shows that this sensor can achieve a theoretical detection limit of 325 electrons or holes per square micrometer. Meanwhile, it also works well as a refractive index sensor with the frequency sensitivity of 485 GHz/RIU. Our results may contribute to design of ultra-micro terahertz sensors.

关键词: metamaterial, terahertz, strong coupling, sensor

Abstract: We propose a terahertz hybrid metamaterial composed of subwavelength metallic slits and graphene plasmonic ribbons for sensing application. This special design can cause the interaction between the plasmon resonances of the metallic slits and graphene ribbons, giving rise to a strong coupling effect and Rabi splitting. Intricate balancing in the strong coupling region can be perturbed by the carrier concentration of graphene, which is subject to the analyte on its surface. Thereby, the detection of analyte can be reflected as a frequency shift of resonance in terahertz transmission spectra. The result shows that this sensor can achieve a theoretical detection limit of 325 electrons or holes per square micrometer. Meanwhile, it also works well as a refractive index sensor with the frequency sensitivity of 485 GHz/RIU. Our results may contribute to design of ultra-micro terahertz sensors.

Key words: metamaterial, terahertz, strong coupling, sensor

中图分类号: 

  • 87.50.U-
87.85.fk (Biosensors)