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Graphene plasmonic nanogratings for biomolecular sensing in liquid

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Abstract

We design a surface plasmon resonance (SPR) molecular sensor based on graphene and biomolecule adsorption at graphene–liquid interfaces. The sensor configuration consists of two opposing arrays of graphene nanograting mounted on a substrate, with a liquid-phase sensing medium confined between them. We characterize the design in simulation on a variety of substrates by altering the refractive index of the sensing medium and varying the absorbance–transmittance characteristics. The influence of various parameters on the biosensor’s performance, including the Fermi level of graphene, the dielectric constant of the substrate, and the incident angle for plasmon excitation, is investigated. Numerical simulations demonstrate the sensitivity higher than 3000 nm/RIU (refractive index unit). The device supports a wide range of substrates in which graphene can be epitaxially grown. The proposed biosensor works independent of the incident angle and can be tuned to cover a broadband wavelength range.

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Acknowledgements

The authors thank Prof. John X.J. Zhang from Dartmouth College and Prof. Stephen D. Gedney from the University of Colorado Denver for the fruitful discussion and guidance.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Connecticut, Storrs, CT, 06269, USA

    Meysam T. Chorsi

  2. Department of Biomedical Engineering, University of Connecticut, Storrs, CT, 06269, USA

    Meysam T. Chorsi

  3. Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA

    Hamid T. Chorsi

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  1. Meysam T. Chorsi
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Correspondence to Meysam T. Chorsi.

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Chorsi, M.T., Chorsi, H.T. Graphene plasmonic nanogratings for biomolecular sensing in liquid. Appl. Phys. A 123, 757 (2017). https://doi.org/10.1007/s00339-017-1380-9

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  • DOI: https://doi.org/10.1007/s00339-017-1380-9

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