研究目的
Investigating the influences of the structured parameters on the refractive index sensing performances for the side-polished macrobending plastic optical fibers (POFs) based surface plasmon resonance (SPR) sensors.
研究成果
The side-polished macrobending POF with a gold thickness of 40 nm could obtain a narrower FWHM, and the side-polished depth had little impact on sensitivity, but if the polished depth was too large, the FWHM will increase. The probe with a decreased macrobending radius will narrow the FWHM and increase the sensitivity for high refractive index, and by altering the polished angle in some extent, the linearity of the sensor could be improved, but as the polished angle increases, the FWHM was also broadened.
研究不足
There were some tradeoffs as changing the structural parameters to improve the SPR sensor performances.
1：Experimental Design and Method Selection:
A controllable rotary grinding technique was employed to fabricate the POF probes. The performances of sensitivity, resolution and full width at half maximum (FWHM) were evaluated.
2：Sample Selection and Data Sources:
The investigated sensor probes were made of commercially available step-index POF (Eska, SK20) with a core material of PMMA and a cladding material of fluorinated polymer.
3：List of Experimental Equipment and Materials:
Halogen lamp (ideaoptics HL2000), spectrum analyzer (ideaoptics NOVA), deionized water, glycerol–water solutions, Abbe refractometer.
4：Experimental Procedures and Operational Workflow:
The POF was inserted and fixed into a metal mold with groove and curved top, then a hair dryer was used to heat the macrobending section of the POF until a stable bending structure was obtained. A rotary grinding system was introduced to better control the polishing process.
5：Data Analysis Methods:
The performances of sensitivity, resolution and full width at half maximum (FWHM) were evaluated.
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