Giant Goos-Hänchen Shifts in Au-ITO-TMDCs-Graphene Heterostructure and Its Potential for High Performance Sensor

In order to improve the performance of surface plasmon resonance (SPR) biosensor, the structure based on two-dimensional (2D) of graphene and transition metal dichalcogenides (TMDCs) are proposed to greatly enhance the Goos-Hänchen (GH) shift. It is theoretically proved that GH shift can be signific...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-02, Vol.20 (4), p.1028
Main Authors: Han, Lei, Pan, Jianxing, Wu, Chuan, Li, Keliang, Ding, Huafeng, Ji, Qizheng, Yang, Ming, Wang, Jin, Zhang, Huijie, Huang, Tianye
Format: Article
Language:English
Subjects:
goos-hänchen shifts
graphene
sensitivity
surface plasmon resonance
transition metal dichalcogenides
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Summary:In order to improve the performance of surface plasmon resonance (SPR) biosensor, the structure based on two-dimensional (2D) of graphene and transition metal dichalcogenides (TMDCs) are proposed to greatly enhance the Goos-Hänchen (GH) shift. It is theoretically proved that GH shift can be significantly enhanced in SPR structure coated with gold (Au)-indium tin oxide (ITO)-TMDCs-graphene heterostructure. In order to realize high GH shifts, the number of TMDCs and graphene layer are optimized. The highest GH shift (-801.7 λ) is obtained by Au-ITO-MoSe -graphene hybrid structure with MoSe monolayer and graphene bilayer, respectively. By analyzing the GH variation, the index sensitivity of such configuration can reach as high as 8.02 × 10 λ/RIU, which is 293.24 times of the Au-ITO structure and 177.43 times of the Au-ITO-graphene structure. The proposed SPR biosensor can be widely used in the precision metrology and optical sensing.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20041028