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Higher order Fano graphene metamaterials for nanoscale optical sensing


Plasmonic Fano metamaterials provide a unique platform for optical sensing applications due to their sharp spectral response and ability to confine light to nanoscale regions that make them strong prospect for refractive-index sensing. Higher order Fano resonance modes in noble metal plasmonic structures can further improve the sensitivity, but their applications are heavily limited by crosstalk between different modes due to the large damping rates and broadband spectral responses of the metal plasmon modes. Here, we create pure higher order Fano modes by designing asymmetric metamaterials comprised of a split-ring resonator and disk with the low-loss graphene plasmon. These higher order modes are highly sensitive to nanoscale analyte (8 nm thick) both in refractive-index and infrared vibrational fingerprints sensing, as demonstrated by the numerical calculation. The frequency sensitivity and figure-of-merit of hexacontatetrapolar mode can reach 289 cm-1/RIU and 29, respectively, and it can probe the weak infrared vibrational modes of the analyte with more than 400 times enhancement. The enhanced sensitivity and tunability of higher order Fano graphene metamaterials promise a high-performance nanoscale optical sensor.

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Publication details

The article was accepted on 27 Aug 2017 and first published on 05 Sep 2017

Article type: Paper
DOI: 10.1039/C7NR05919A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Higher order Fano graphene metamaterials for nanoscale optical sensing

    X. Guo, H. Hu, X. Zhu, X. Yang and Q. Dai, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05919A

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