研究目的
Investigating the effect of gold film thickness on the refractive index and temperature sensing performance of a hetero-core optical fiber (MMF-NCF-MMF) surface plasmon resonance (SPR) sensing structure.
研究成果
The MMF-NCF-MMF hetero-core fiber SPR structure's sensing performance depends on the gold film thickness, with maximum sensitivities of 2933.25 nm/RIU for refractive index and ?0.91973 nm/? C for temperature. The sensor has different optimal gold film thicknesses for temperature and refractive index measurements, offering simple structure, easy implementation, and good robustness for broad applications.
研究不足
The study is limited by the errors in film thickness, refractive index, and temperature measurements. The optimal gold film thickness varies for different application cases (refractive index vs. temperature sensing).
1：Experimental Design and Method Selection:
A hetero-core optical fiber (MMF-NCF-MMF) structure was fabricated and coated with gold thin film by magnetron sputtering. The SPR spectral sensitivity, FWHM, VD, and FOM were defined to evaluate the sensing performance.
2：Sample Selection and Data Sources:
Glycerol aqueous solution and ethanol were utilized for refractive index and temperature sensing experiments, respectively.
3：List of Experimental Equipment and Materials:
Halogen light source (HL-2000, Ocean Optics), optical fiber spectrometer (USB4000, Ocean Optics), magnetron sputtering device (ETD-900M, Elaborate Technology Development).
4：Experimental Procedures and Operational Workflow:
The gold film thickness was measured by a step profiler. The transmission spectra at different surrounding refractive indices and ambient temperatures were recorded.
5：Data Analysis Methods:
The SPR spectrum was normalized and smoothed to reduce high-frequency noise. The resonance wavelength shift was analyzed to determine sensitivities.
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