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We theoretically propose a surface-plasmon-based fiber optic biosensor in metal/graphene/MoS 2 configuration with molybdenum disulfide (MoS 2 ) as a bio recognition layer. The proposed configuration works in the visible region of the electromagnetic spectrum with a very high sensitivity. A comparative theoretical study of the sensors with different metallic layers of gold (Au), copper (Cu), and aluminum (Al) has been performed. The sensor has been found to be the most sensitive in both Cu/graphene/MoS 2 and Al/graphene/MoS 2 configurations with sensitivity of 6.2 μm/RIU. In both of the configurations the thicknesses of Cu and Al layers is 50 nm and the number of layers of graphene is 16 and 27, respectively, while only a single layer of MoS 2 has been used. The sensitivity of the sensor in the Au/graphene/MoS 2 configuration is 5.0 μm/RIU with comparatively high depth of resonance.
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Mishra et al. (2016) studied this question.
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