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. 2018 Dec 18;18(12):4489. doi: 10.3390/s18124489

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) The transmission spectra of graphene with different sensing medium refractive index (n_med); (B) full width at half maximum (FWHM) and figure of merit (FOM) of mode A and mode B for different the n_med; (C) For mode A and mode B, the transmission dip wavelength corresponding to transmission dip as a function of the n_med. Structural parameters: L = 180 nm; P = 300 nm; W₁ = W₂ = 30 nm; and n_g = 3 × 10¹³ cm⁻².