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Sub-Wavelength Grating Enhanced Ultra-Narrow Graphene Perfect Absorber

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Abstract

A sub-wavelength grating has been elaborately designed to enhance the absorption of the monolayer graphene at λ = 1.55 μm based on the coupled leaky mode theory (CLMT). The results indicate that the absorption can reach 99.8% at the resonant wavelength, and the absorption peak is ultra-narrow due to the excitation of TM31 mode in the grating structure. Taking advantages of the tunable chemical potential of graphene which is bias voltage controllable, the proposed structure can function as an adjustable absorber. The high figure of merit up to 1329 and sensitivity with the value of 66 are achieved. With the ultra-narrow absorption band and tunable peak positions, the graphene perfect absorber holds great potential application in sensing and biology.

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Funding

The authors acknowledge the support provided by the Ministry of Science and Technology of China (2017YFA0205801), the National Natural Science Foundation of China (11334008, 61705249, 61290301 and 61521005), the Fund of Shanghai Science and Technology Foundation (16JC1400401, 16ZR1445300, 16JC1400404), Shanghai Sailing Program (16YF1413200), Youth Innovation Promotion Association CAS (2017285), and Key research project of Frontier Science of Chinese Academy of Sciences (QYZDJ-SSW-JSC007).

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Authors and Affiliations

  1. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China

    Zengyue Zhao, Guanhai Li, Feilong Yu, Hui Yang, Xiaoshuang Chen & Wei Lu

  2. University of Chinese Academy of Science, No.19 A Yuquan Road, Beijing, 100049, China

    Zengyue Zhao, Guanhai Li, Feilong Yu, Hui Yang, Xiaoshuang Chen & Wei Lu

  3. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China

    Zengyue Zhao

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  1. Zengyue Zhao
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  2. Guanhai Li
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  3. Feilong Yu
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  4. Hui Yang
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  5. Xiaoshuang Chen
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  6. Wei Lu
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Corresponding authors

Correspondence to Guanhai Li or Xiaoshuang Chen.

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Zhao, Z., Li, G., Yu, F. et al. Sub-Wavelength Grating Enhanced Ultra-Narrow Graphene Perfect Absorber. Plasmonics 13, 2267–2272 (2018). https://doi.org/10.1007/s11468-018-0748-9

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  • DOI: https://doi.org/10.1007/s11468-018-0748-9

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