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Sensitivity enhancement for a multimode fiber sensor with an axisymmetric metal grating layer
Institution:1. Photonics Research Center, School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland;2. Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China;3. School of Physics, Trinity College Dublin, Dublin 2, Ireland;4. CRANN, Trinity College, Dublin 2, Ireland;1. Department of Physics, Faculty of Science, Damietta University, New Damietta, 34517, Egypt;2. Department of Physics, College of Science, King Khalid University, P.O. 9004, Abha, Saudi Arabia;3. Department of Physics, College of Science for Girls in Abha, King Khalid University, Abha, P.O. 960, Saudi Arabia;1. Department of Electrical Engineering, National Kaohsiung University of Applied Sciences, Taiwan;2. Department of Microelectronics Engineering, National Kaohsiung Marine University, Taiwan
Abstract: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 13,000 nm/RIU (refractive index unit) for a refractive index range from 1.3 to 1.4.
Keywords:Metal grating  Multimode fiber sensor  Refractomter
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