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  • Received: Apr. 5, 2015

    Accepted: Jun. 8, 2015

    Posted: Jan. 23, 2019

    Published Online: Sep. 14, 2018

    The Author Email: Wei Wei (

    DOI: 10.3788/COL201513.082801

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    Wei Wei, Jinpeng Nong, Linlong Tang, Guiwen Zhang, Xiao Jiang, Yong Zhu. Reflection-type infrared biosensor based on surface plasmonics in graphene ribbon arrays[J]. Chinese Optics Letters, 2015, 13(8): 082801

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Chinese Optics Letters, Vol. 13, Issue 8, 082801 (2015)

Reflection-type infrared biosensor based on surface plasmonics in graphene ribbon arrays

Wei Wei1,2,3,4,*, Jinpeng Nong1,2, Linlong Tang3,4, Guiwen Zhang1,2, Xiao Jiang1,2, and Yong Zhu1,2,4

Author Affiliations

  • 1Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China
  • 2College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
  • 3Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China
  • 4Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China


We propose a reflection-type infrared biosensor by exploiting localized surface plasmons in graphene ribbon arrays. By enhancing the coupling between the incident light and the resonant system, an asymmetric Fabry–Perot cavity formed by the ribbons and reflective layer is employed to reshape the reflection spectra. Simulation results demonstrate that the reflection spectra can be modified to improve the figure of merit (FOM) significantly by adjusting the electron relaxation time of graphene, the length of the Fabry–Perot cavity, and the Fermi energy level. The FOM of such a biosensor can achieve a high value of up to 36/refractive index unit (36/RIU), which is 4 times larger than that of the traditional transmission-type one. Our study offers a feasible approach to develop biosensing devices based on graphene plasmonics with high precision.