CH3NH3PbBr3 Thin Film Served as Guided-Wave Layer for Enhancing the Angular Sensitivity of Plasmon Biosensor.

Leiming Wu,Yuwen Qin,Yuanjiang Xiang

doi:10.3390/bios11110415

Abstract

CH3NH3PbBr3 perovskite thin film is used as a guided-wave layer and coated on the surface of an Au film to form the Au-perovskite hybrid structure. Using the hybrid structure, a perovskite-based guided-wave surface plasmon resonance (GWSPR) biosensor is proposed with high angular sensitivity. First, it is found that the electric field at the sensing interface is improved by the CH3NH3PbBr3 perovskite thin film, thereby enhancing the sensitivity. The result demonstrates that the angular sensitivity of the Au-perovskite-based GWSPR biosensor is as high as 278.5°/RIU, which is 110.2% higher than that of a conventional Au-based surface plasmon resonance (SPR) biosensor. Second, the selection of the coupling prism in the configuration of the GWSPR biosensor is also analyzed, and it indicates that a low refractive index (RI) prism can generate greater sensitivity. Therefore, the low-RI BK7 prism is served as the coupling prism for the proposed GWSPR biosensor. Finally, the proposed GWSPR sensing structure can not only be used for liquid sensing, but also for gas sensing, and it has also been demonstrated that the GWSPR gas sensor is 2.8 times more sensitive than the Au-based SPR gas sensor.

Highlights

Advanced Institute of Photonics Technology, School of Information Engineering, Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510006, China
surface plasmon resonance (SPR) biosensor is calculated by transfer matrix method (TMM), and it is found that the largest variation of the resonance angle caused by the ∆ns = 0.002 is ∆θ = 0.27◦, when the BK7 glass is used as the coupling prism (Figure 2c)
A new Au-CH3 NH3 PbBr3 hybrid structure-based guided-wave surface plasmon resonance (GWSPR) configuration is designed to be applied in refractive index (RI) biosensor and gas sensors

Summary

Introduction

CH3 NH3 PbBr3 perovskite thin film is used as a guided-wave layer and coated on the surface of an Au film to form the Au-perovskite hybrid structure. A perovskite-based guided-wave surface plasmon resonance (GWSPR) biosensor is proposed with high angular sensitivity. The result demonstrates that the angular sensitivity of the Au-perovskite-based GWSPR biosensor is as high as 278.5◦ /RIU, which is 110.2% higher than that of a conventional Au-based surface plasmon resonance (SPR) biosensor. The proposed GWSPR sensing structure can be used for liquid sensing, and for gas sensing, and it has been demonstrated that the GWSPR gas sensor is 2.8 times more sensitive than the Au-based SPR gas sensor

Methods

Results

Conclusion