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This paper proposes a novel design for a surface plasmon resonance (SPR) fiber sensor with an axisymmetric sub-wavelength metal grating layer. The relationship between the sensor performance (the sensitivity S and the quality factor Q of the SPR dip) and the characteristic parameters are investigated. Numerical simulation results show that the proposed sensor can achieve a maximum sensitivity of 13000nm/RIU (refractive index unit) for a refractive index range from 1.3 to 1.4.
Ma, Y., Farrell, G., Semenova, Y., Chan, H., Zhang, H. and Wu, Q. Sensitivity Enhancement for a Multimode Fiber Sensor with an Axisymmetric Metal Grating Layer. Photonics and Nanostructures - Fundamentals and Applications. In Press, Accepted Manuscript, Available online 22 August 2013. doi:10.1016/j.photonics.2013.08.001