Surface plasmon resonance dual parameter sensor based on high birefringence side polishing photonic crystal fibers
A high-birefringence photonic crystal fiber sensor is designed using surface plasmon resonance technol-ogy,which can realize a wide range of dual-parameter high-sensitivity sensing.The structure is polished on the side,and the internal air holes are arranged in a triangular lattice.The gold nano layer is coated on the polishing surface and directly contacts the object to be measured as a channel for measuring the refractive index,which is more convenient for the detection work.The oval hole near the fiber core is filled with chloroform to detect the temperature.Two independent channels and the birefringence introduced by asymmetry can ensure independent measurement of refractive index and temperature changes,which solves the problem of cross sensitivity.With the help of the full-vector finite element software COMSOL Multiphysics,the flexible use of scattering boundary con-ditions can perform numerical analysis and research on the optical characteristics of photonic crystal fiber sensor.The experimental results show that the sensor proposed in this paper can measure the refractive index range of 1.32～1.39,the temperature range of 20～60℃,and the obvious surface plasmon resonance effect can be ob-served in the wavelength range of 500～1 100 nm.In order to further analyze the performance of the structure,the main structural parameters(gold film thickness m1,Ta2O5 thickness m2,central air hole diameter d1,and duty cycle)are studied and analyzed.The simulation results show that the average wavelength sensitivity of re-fractive index sensing is 5700nm/RIU,the maximum wavelength sensitivity is 13200nm/RIU,the maximum am-plitude sensitivity is 818.44RIU-1,and the refractive index resolution of the sensor is 1.75×10-5 RIU.The tem-perature sensing range is 20～60℃,the maximum wavelength sensitivity is 2.6nm/℃,the maximum amplitude sensitivity is 0.363℃-1,and the temperature resolution of the sensor is 3.84×10-2℃.This work has guiding significance for the design and implementation of high-sensitivity,real-time,distributed,multi-parameter meas-urement SPR sensors.
photonic crystal fibersurface plasmon resonancehigh birefringencerefractive index sensingtemperature sensing
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