Journal
APPLIED OPTICS
Volume 57, Issue 19, Pages 5268-5272Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.57.005268
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Funding
- National Key Research and Development Program of China [2017YFF02098-01]
- Natural Science Foundation of Guangxi Province [ZR201709200426]
- Natural Science Foundation of Shandong Province [ZR2018MF031]
- National Natural Science Foundation of China (NSFC) [11504070]
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In this work, we proposed a high-resolution D-shaped photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor based on gold grating. Gold grating is introduced to modulate the resonance wavelength and enhance the refractive index (RI) sensitivity. Structure parameters of PCF and gold grating are analyzed by the finite element method for optimizing the SPR sensor. The simulation results indicate that air hole pitch, air hole diameter, and gold thickness and grating constant have little influence on the sensitivity of the refractive index, which reduces the requirement of precise processing. For improving the resolution of RI sensing, a two-feature (2F) interrogation method, which combines wavelength interrogation and amplitude interrogation, is used. The maximum theoretical resolution of the SPR sensor reaches to 5.98 x 10(-6) RIU in the range of 1.36-1.38, and the wavelength sensitivity reaches to 3340 nm/RIU. The proposed SPR sensor shows potential applications for developing a high-sensitivity, real-time, and fast-response SPR-RI sensor. (C) 2018 Optical Society of America
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