楔形微纳光纤能量分布特性研究

Energy distribution of wedge-shaped micro/nano fiber

为了探究楔形端面对光纤传输特性的影响,采用COMSOL Multiphysics数值仿真软件,模拟研究了具有楔形端面的微纳光纤,数值计算了两根楔形微纳光纤的耦合效率,得到了单根楔形微纳光纤中的能量分布和两根光纤发生耦合时的耦合效率。结果表明,越靠近楔形微纳光纤的尖端位置,束缚在纤芯表面上的能量越多;沿着光场的传输方向,楔形区域中的能量密度先增大后减小;楔形端面处存在的菲涅耳反射对耦合效率有微小的影响,但不影响整体变化规律;轴向位移和径向位移的增大,都会使得耦合效率减小,而随着楔角的增大,耦合效率先减小后增大。对楔形微纳光纤的研究,将为其在光纤传感领域的应用打下基础。

In order to explore effect of wedge end on the characteristics of fiber transfer,wedge-shaped micro / nano fiber was studied and coupling efficiency of two wedge-shaped micro / nano fibers was calculated by using COMSOL Multiphysics numerical simulation software. Energy distribution of a single wedge-shaped micro-nano fiber and coupling efficiency of two fibers were obtained. The results show that more energy is distributed on the surface of the fiber core when it gets closer to the fiber tip.Along the direction of transmission,there is an increase of energy density of the wedge at first and then a decrease. Fresnel reflection of wedge-shaped end has a little influence on coupling efficiency and the whole variation. Coupling efficiency would decrease with the increase of axial displacement and radial displacement,and would decrease at first and then increase with the increase of wedge angle. The study of micro / nano fiber will lay the foundation in fiber optic sensing field.