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Coupling of Graphene Plasmonics Modes Induced by Near-Field Perturbation at Terahertz Frequencies

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Abstract

The coupling between graphene surface plasmonic (GSP) modes and evanescent wave modes induced by near-field perturbation is investigated systematically in the grating-spacer-graphene hybrid system. Simulation results show that the near-field perturbation due to a small change of the geometrical structure disturbs the coupling characteristics, leading to the evolution of the absorption spectra and the spatial energy redistribution of GSP modes. By exploring the physical mechanism, the shift of the resonant absorption frequency can be quantified through the variation of the effective permittivity around graphene, while the first order evanescent wave in the grating plays a fundamental role in determining the absorbance in the coupling process. Further discussion indicates that the different penetration abilities of GSP wave into dielectric and metal grating contribute to the discrepancy of the energy distribution of GSP modes. Our study provides new physical insight and promotes a further step for the design of plasmonics devices at terahertz frequencies.

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Acknowledgements

This work is supported by the National High Technology Research and Development Program of China (2015AA034801), National Natural Science Foundation of China (No.61405021, 11374359), Specialized Research Fund for the Doctoral Program of Higher Education (20120191120021), Natural Science Foundation of Chongqing, China (cstc2014jcyjA40045), and the Fundamental Research Funds for the Central Universities (CDJZR12120004, 106112013CDJZR120006).

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Authors and Affiliations

  1. Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education of China, Chongqing University, Chongqing, 400044, China

    Wei Wei, Jinpeng Nong & Yong Zhu

  2. College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, China

    Wei Wei, Jinpeng Nong & Yong Zhu

  3. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 401122, China

    Wei Wei, Linlong Tang & Haofei Shi

  4. Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing, 401329, China

    Haofei Shi

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  1. Wei Wei
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  2. Jinpeng Nong
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  3. Linlong Tang
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  4. Yong Zhu
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Correspondence to Wei Wei.

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Wei, W., Nong, J., Tang, L. et al. Coupling of Graphene Plasmonics Modes Induced by Near-Field Perturbation at Terahertz Frequencies. Plasmonics 11, 1109–1118 (2016). https://doi.org/10.1007/s11468-015-0149-2

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