研究目的
Investigating the design and characterization of surface relief grating on etched multimode optical fiber for refractive index sensing.
研究成果
The proposed optical fiber sensor based on surface relief gratings on etched MMF demonstrates a sensitivity of 70 nm/RIU for refractive index sensing. The device is compact, easy to fabricate, and robust, making it suitable for harsh environmental conditions and potential applications in chemical and biological sensing.
研究不足
The study is limited to refractive index sensing within a specific range (1.333 to 1.345). The fabrication process requires precise control to achieve the desired grating parameters, and the device's performance may be affected by environmental factors not tested in this study.
1：Experimental Design and Method Selection:
The study involves the fabrication of surface relief gratings on the core of graded-index multimode optical fiber (GIMMF) using focused ion beam milling (FIB) for refractive index sensing.
2：Sample Selection and Data Sources:
A standard graded-index MMF of core diameter 50 μm and cladding diameter 125 μm was used. The cladding region was etched using concentrated hydrogen fluoride.
3：List of Experimental Equipment and Materials:
Equipment includes a tunable laser source (TLS, YOKOGAWA-AQ2202), optical spectral analyzer (OSA, YOKOGAWA-AQ6319), and FIB system for grating fabrication. Materials include NaCl solutions of varying concentrations for sensitivity testing.
4：Experimental Procedures and Operational Workflow:
The cladding of the MMF was etched, followed by FIB milling to create surface relief gratings. The device was then tested by immersing it in NaCl solutions of different concentrations to measure refractive index sensitivity.
5：Data Analysis Methods:
The sensitivity of the device was calculated based on the wavelength shift observed in the reflection spectrum for different refractive indices.
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