Journal
PLASMONICS
Volume 14, Issue 6, Pages 1743-1750Publisher
SPRINGER
DOI: 10.1007/s11468-019-00968-z
Keywords
SPR; Metal-ITO-WS2 hybrid structure; Phase sensitivity; Reflectivity
Funding
- National Natural Science Foundation of China [61605179]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [162301132703, G1323511665]
- 863 High Technology Plan [2015AA015502]
- Fundamental Research Founds for National University, China University of Geosciences (Wuhan) [1810491T06]
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Surface plasmon resonance (SPR) biosensor is widely used for its high precision and real-time analysis. In this paper, SPR biosensor based on the hybrid structure of metal-indium tin oxide (ITO)-WS2 are proposed and investigated. By optimizing the thickness of metals (Au, Cu, Ag), ITO and WS2, the reflectivity of 2.932 x 10(-7) a.u and highest phase sensitivity of 1.711 x 106 deg/RIU are obtained by using Ag-ITO-WS2-dielectric structure. Compared with the traditional metal-based SPR sensor, the performance of the proposed one is improved up to similar to 25.8 times. The results show that ITO and WS2 have an important effect on enhancing SPR sensing performance.
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