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Theoretical investigation of an enhanced Goos–Hänchen shift sensor based on a BlueP/TMDC/graphene hybrid

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Abstract

The Goos–Hänchen (GH) shift caused by blue phosphorene/transition metal dichalcogenides (BlueP/TMDCs) and graphene surface plasma resonance (SPR) in Kretschmann configuration are studied theoretically. In this structure, graphene and BlueP/TMDCs coated on Cu thin film are optimized to improve the GH shift. The highest GH shift of sensor $\text{Cu} {\text -} \text{BlueP}/\text{WS}_2$–graphene is ${1004}\lambda$ with three layers $\text{BlueP}/\text{WS}_2$ and a graphene monolayer. For the sensing application, the sensitivity corresponding to the optimal GH shift is ${3.199} \times {{10}^6}\;\lambda /\text{RIU}$, which is 210.8 times higher than the traditional Cu film, 181.4 times higher than the $\text{Cu} {\text -} \text{BlueP}/\text{WS}_2$ (monolayer) structure, and 56.6 times higher than the Cu–graphene structure. Therefore, the SPR sensor with high GH shift can be extensively used in the fields of chemical, biomedical, and environmental monitoring.

© 2020 Optical Society of America

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