Abstract
A novel SPR biosensor that can achieve a high sensitivity is proposed; therefore, a new prism coupling structure based on metal nanowires array layer is designed in this paper. The thickness of each medium layer for the structure is analyzed to obtain the optimal SPR spectrum, by the finite element method, so that the sensitivity is able to be enhanced greatly. The optimal thicknesses of each medium layer are given, and the sensitivity of the SPR biosensor can reach as high as 210.75°/RIU for the refractive index of the sensing medium, from 1.30 to 1.38.
Highlights
Surface plasmon resonance (SPR) is the resonance for free electrons with collective oscillations in the metal surface when excited by the incident light, and the energy of the incident light would be absorbed by free electrons during the resonance, so that the energy of the output light would be decreased to some extent [1,2,3]. e decreasing degree of the output light is related to the the incident light, and the SPR angle is the incident light as the output light is decreased to the minimum
Graphene oxide (GO) has several advantages because of its extraordinary optical and structural properties, and it was studied that there was four times greater sensitivity for the SPR biosensor based on graphene oxide (GO) than that based on the conventional gold film [18,19,20]. en, the GO-MoS2 hybrid nanolayer was chosen to strengthen the SPR effect
The conclusion is still effective for other thicknesses of TiO2, Zn oxide (ZnO), Au, and GO layer, as the same case of the refractive index for the sensing medium layer
Summary
Surface plasmon resonance (SPR) is the resonance for free electrons with collective oscillations in the metal surface when excited by the incident light, and the energy of the incident light would be absorbed by free electrons during the resonance, so that the energy of the output light would be decreased to some extent [1,2,3]. e decreasing degree of the output light is related to the the incident light, and the SPR angle is the incident light as the output light is decreased to the minimum. E two features, the high detection sensitivity and the good SPR peak for better precision, are critical to the function implementation of the SPR biosensor as well as its application. Ere are many studies on the sensitivity of the SPR biosensor before, such as transition metal dichalcogenides (TMDC) materials [10], magneto-optic (MO) material layer [11], magneto-plasmonic (MP) transducers [12], graphene [13, 14], graphene-MoS2 hybrid nanostructures [15], and graphene and silicon layers [16]. A novel SPR biosensor capability of achieving a higher sensitivity was proposed in this paper which can provide a further theoretical preparation for making the SPR biosensor detecting instrument in the future
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