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利用微纳光纤强的倏逝场特性和平面光栅的折射率周期性分布特性,设计了一种新型的基于微纳光纤和平面光栅复合光波导折射率传感器,并利用时域有限差分(FDTD)方法,对复合光波导的光学特性和折射率传感特性进行了仿真研究。结果表明,本文的复合光波导的透射光谱中心波长对其周围物质折射率变化非常敏感,灵敏度为346nm/RIU(refractive index unit)。
Based on the evanescent field properties of micro / nano fibers and the periodic distribution of the refractive index of the planar grating, a novel optical waveguide refractive index sensor based on the micro-nano fiber and the plane grating was designed. The finite difference time domain (FDTD) Method, the optical properties and refractive index sensing characteristics of the composite optical waveguide were simulated. The results show that the center wavelength of the transmission spectrum of the composite optical waveguide in this paper is very sensitive to the change of the refractive index of the surrounding materials. The sensitivity is 346nm / RIU (refractive index unit).