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Proceedings Paper

An infrared biosensor based on graphene plasmonic for integrated nanofluidic analysis
Author(s): Wei Wei; Jinpeng Nong; Guiwen Zhang; Yong Zhu
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Paper Abstract

We propose an infrared biosensor for nanofluidic analysis based on graphene plasmonics, which consists of a nanochannel etching on a silicon substrate and a graphene sheet covered on the top of the channel. The change of refractive index due to the absorption of biomolecules in the nanochannel can be measured by detecting the wavelength shifts of resonant dips. To achieve the best optical performances of the biosensor, an optical model based on finite element method is built to optimize the structure parameters of the biosensor. Numerical simulation results show that a biosensor with a larger top width and a higher depth shows a better overall performance and a high sensitivity value of up to 1920nm/RIU can be achieved in an optimized structure. In addition, the biosensor can dynamically work at a wide range of infrared region by adjusting the Fermi level of graphene. Graphene is pre-coated with poly methyl methacrylate to overcome the effect that the portion of graphene over the nanochannel will be strained and the influence of the thickness of this coated layer on the performances of biosensor is very small. The designed graphene plasmonics devices will advance further applications of graphene in integrated nanofluidic analysis and infrared biosensors.

Paper Details

Date Published: 13 November 2014
PDF: 9 pages
Proc. SPIE 9278, Plasmonics, 92780F (13 November 2014); doi: 10.1117/12.2071778
Show Author Affiliations
Wei Wei, Ministry of Education of China (China)
Chongqing Univ. (China)
Jinpeng Nong, Ministry of Education of China (China)
Chongqing Univ. (China)
Guiwen Zhang, Ministry of Education of China (China)
Chongqing Univ. (China)
Yong Zhu, Ministry of Education of China (China)
Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 9278:
Xing Zhu; Satoshi Kawata; David J. Bergman; Peter Nordlander; Francisco Javier García de Abajo, Editor(s)

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