Journal
OPTICS EXPRESS
Volume 18, Issue 14, Pages 14395-14400Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.014395
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- Singapore Agency for Science, Technology, and Research, Science and Engineering Research Council (A*STAR-SERC) [102 152 0014]
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A surface plasmon resonance (SPR) based graphene biosensor is presented. It consists of a graphene sheet coated above a gold thin film, which has been proposed and experimentally fabricated recently [ChemPhysChem 11, 585 (2010)]. The biosensor uses attenuated total reflection (ATR) method to detect the refractive index change near the sensor surface, which is due to the adsorption of biomolecules. Our calculations show that the proposed graphene-on-gold SPR biosensor (with L graphene layers) is (1 + 0.025 L) x gamma (where gamma > 1) times more sensitive than the conventional gold thin film SPR biosensor. The improved sensitivity is due to increased adsorption of biomolecules on graphene (represented by the factor gamma) and the optical property of graphene. (C) 2010 Optical Society of America
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