title: Infrared biosensors based on graphene plasmonics: modeling.
abstract: We propose a biosensor by exploiting localized plasmons in graphene and biomolecule adsorption on it. Numerical simulations demonstrate that the sensitivity of such a device can achieve a high value of up to 1697 nm/RIU (refractive index unit) when the wavelength shift at the plasmon resonance is detected. The transparent substrate supporting graphene can be chosen potentially from a wide range of materials including insulators, semiconductors, polymers, and gels. The plasmon resonance wavelength can be tuned with electrostatic doping and/or structure modulation of graphene. Furthermore, the device works in a wide angle range of incident light since the transverse magnetic (TM) polarization is independent of incident angles.
authors.affiliation: Department of Materials Science and Engineering and CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, 96 Jin Zhai Rd, Hefei 230026, China. zhuyanwu@ustc.edu.cn yllu@ustc.edu.cn.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xiang
authors.initials: X
authors.lastname: Hu
authors.forename: Guanxiong
authors.initials: G
authors.lastname: Chen
authors.forename: Xuanru
authors.initials: X
authors.lastname: Zhang
authors.forename: Ziqi
authors.initials: Z
authors.lastname: Tan
authors.forename: Junhua
authors.initials: J
authors.lastname: Chen
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Zhu
authors.forename: Yalin
authors.initials: Y
authors.lastname: Lu