双芯D型高灵敏度光子晶体光纤传感器的设计

Design of Dual Core D-type Photonic Crystal Fiber Sensor with High Sensitivity

该文提出了一种双芯D型高灵敏度的表面等离子体共振-光子晶体光纤(SPR-PCF)传感器,利用SPR技术,通过纤芯损耗谱测量共振波长的变化来达到测量待测物质不同折射率的目的。通过改变内部空气孔的排列,使之达到双芯传输的效果,同时D型结构有利于加快SPR反应。其工作的波长范围可以调节,且结构简单,易于测量操作。实验结果表明,其折射率测量区间为1.35~1.40,可得最大光谱灵敏度为15000 nm/RIU,最大幅值灵敏度为582.12 RIU-1,探针折射率精度为1.56×10-5 RIU。

This paper proposes a dual-core D-type high-sensitivity SPR-PCF sensor,which uses the surface plasmon resonance(SPR)technology to measure the change of the resonance wavelength by the core loss spectrum to achieve the purpose of measuring different refractive indices of the substance to be measured.By changing the arrangement of the internal air holes,it achieves the effect of dual core transmission,and the D-type structure is beneficial to speed up the surface plasmon reaction.Its working wavelength range can be adjusted,and its structure is simple and easy to measure and operate.The experimental results show that the refractive index measurement interval is 1.35-1.40.The maximum spectral sensitivity is 15000 nm/RIU,maximum amplitude sensitivity is 582.12 RIU-1,and the refractive index accuracy of the probe is 1.56×10-5 RIU.