| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Refractive index sensor based on high-order surface plasmon resonance in gold nanofilm coated photonic crystal fiber |
| Zhen-Kai Fan(范振凯)1, Shao-Bo Fang(方少波)3,4, Shu-Guang Li(李曙光)2, Zhi-Yi Wei(魏志义)3,4 |
1 School of Information Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;
2 State Key Laboratory of Metastable Materials Science and Technology, and Key Laboratory of Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China;
3 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract We propose a novel kind of wide-range refractive index optical sensor based on photonic crystal fiber (PCF) covered with nano-ring gold film. The refractive index sensing performance of the PCF sensor is analyzed and simulated by the finite element method (FEM). The refractive index liquid is infiltrated into the cladding air hole of the PCF. By comparing the sensing performance of two kinds of photonic crystal fiber structures, a wide range and high sensitivity structure is optimized. The surface plasmon resonance (SPR) excitation material is chose as gold, and large gold nanorings are embedded around the first cladding air hole of the PCF. The higher order surface plasmon modes are generated in this designed optical fiber structure. The resonance coupling between the fundamental mode and the 5th order surface plasmon polariton (SPP) modes is excited when the phase matching condition is matched. Therefore, the 3rd loss peaks appear obvious red-shift with the increase of the analyte refractive index, which shows a remarkable polynomial fitting law. The fitnesses of two structures are 0.99 and 0.98, respectively. When the range of refractive indices is from 1.40 to 1.43, the two kinds of sensors have high linear sensitivities of 1604 nm/RIU and 3978 nm/RIU, respectively.
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Received: 22 January 2019
Revised: 09 June 2019
Accepted manuscript online:
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PACS:
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42.81.Pa
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(Sensors, gyros)
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42.81.Gs
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(Birefringence, polarization)
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFC0110301), the National Natural Science Foundation of China (Grant Nos. 61575219, 91850209, and 11434016), the College Young Talents Program of Hebei Province, China (Grant No. BJ2018040), the Hebei University of Science and Technology Talent Introduction Project, China (Grant No. 1181324), and the Youth Innovation Promotion Association, Chinese Academy of Sciences (Grant No. 2018007). |
Corresponding Authors:
Shao-Bo Fang
E-mail: shaobo.fang@iphy.ac.cn
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Cite this article:
Zhen-Kai Fan(范振凯), Shao-Bo Fang(方少波), Shu-Guang Li(李曙光), Zhi-Yi Wei(魏志义) Refractive index sensor based on high-order surface plasmon resonance in gold nanofilm coated photonic crystal fiber 2019 Chin. Phys. B 28 094209
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