Graphene-MoS2 Hybrid Structure Enhanced Fiber Optic Surface Plasmon Resonance Sensor

Abstract

In this paper, a fiber optic surface plasmon resonance sensor based on graphene-MoS2 hybrid structure is presented. The wavelength interrogation method is employed to analyze the reflection spectra and the performance of the sensor. The theoretical analysis shows that the confined electric field generated at the interface between the sensor surface and the surrounding environment can be enhanced by introducing graphene-molybdenum disulfide (MoS2) hybrid structure as the sensing layers coated on the core of fiber. Such electric field enhancement significantly improves the sensitivity of the fiber optic surface plasmon resonance sensor. Furthermore, it is suggested that coating more number of graphene and MoS2 layers on thicker Au film is a good selection for the higher enhancement of the sensitivity. The sensitivity of the proposed sensor exhibits an enhancement of 20 % compared to that of the conventional fiber optic surface plasmon resonance sensing scheme without graphene-MoS2 hybrid structure. The proposed graphene-MoS2-Au fiber optic surface plasmon resonance sensor is simple in structure, has high sensitivity, and shows good potential in practical applications.