Design of Wavelength Modulation PMMA Optical Waveguide SPR Sensing Structure for Refractive Index Sensing
Optical-waveguide surface plasmon resonance(SPR)sensors are characterized by small sizes,label-free detection capabilities,and ease of integration.In this study,we designed a poly(methyl methacrylate)(PMMA)ridge waveguide SPR sensor sensitive unit based on a wavelength modulation method and optimized its key parameters.Our analysis results showed that the sensor could operate stably within a liquid-refractive-index testing range of 1.33～1.45.In the high-refractive-index detection region,the sensor exhibited a sensitivity of up to 10 220 nm/RIU and a high quality factor of 173 RIU-1.
surface plasmon resonancerefractive index sensingPMMAoptical waveguide sensor
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