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首页> 外文期刊>Optical fiber technology >Enhanced Mach-Zehnder interferometer multimode-single-mode-multimode fiber optic refractive index sensor based on surface plasmon resonance
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Enhanced Mach-Zehnder interferometer multimode-single-mode-multimode fiber optic refractive index sensor based on surface plasmon resonance

机译：Enhanced Mach-Zehnder interferometer multimode-single-mode-multimode fiber optic refractive index sensor based on surface plasmon resonance

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摘要

In this paper, an all-fiber Mach-Zehnder interferometer (MZI) sensor for refractive index (RI) measuring is presented, which is based on Multimode-Single-mode-Multimode (MSM) fiber. The effects of both reducing the radius of the sensing part and the surface plasmon resonance (SPR) on its efficiency are investigated. Increasing the interaction of high-order modes with external media, caused by etching the cladding layer of the single-mode fiber part, significantly improves the sensitivity. Both wavelength and intensity interrogation approaches are employed to study the Multimode-etched Single-mode-Multimode (MESM) fiber sensor. The intensity and the wavelength sensitivities for the RI measurement in the range of 1.428-1.458 are obtained as-2306.754 /RIU and 1315.74 nm/RIU, respectively. Finally, the MESM-SPR sensor is proposed and characterized. Results exhibit high performance in the RI range of 1.333 to 1.357, in which the sensitivity of 1437.056 nm/RIU is achieved. The advantages like low cost, high sensitivity, and simple fabrication methods make these sensors promising devices for chemical, food industry, and biosensing applications.

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