In this paper, we prepared side-polished optical fiber surface plasmon resonance (SPR) sensors, which are embedded in V-groove in quartz glass and are spattered with ~5 nm Cr and ~50 nm Au. The response performance of 50 μm SPR optical fiber sensor to the refractive index matching fluid was tested experimentally. When the refractive index range is 1.335 ~ 1.345, the full width at half maximum (FWHM) of resonant dip is 68 nm, and the sensitivity is 1370 nm/RIU. The surface plasmon wave (SPW) is excited by a broadband light source and a fixed wavelength laser source, and the corresponding detection methods are respectively maximum absorption wavelength detection, and fixed wavelength power absorption detection. The maximum absorption wavelength detection sensitivity is 2000 nm/RIU, and the resolution is 5 × 10-6 RIU. The power absorption ratio detection method can realize resolution 3.5 × 10-4 RIU.
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