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. 2019 May 18;20(10):2461. doi: 10.3390/ijms20102461

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© 2019 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 structure of surface plasmon resonance (SPR) sensor and its working principle. (b) Simulated transmittance of light at λ₀ = 633 nm (crosses) and measured transmittance of white light (squares) as a function of the number of graphene layers. (c) The SPR curves for the conventional biosensor (L = 0) and the monolayer graphene biosensor (L = 1) for He-Ne laser light. (d) The sensitivity enhancement ΔS_RI^L/S_RI⁰ as a function of the number of graphene layers L. Reproduced from [68] with permission of the Optical Society of America.