Energy distribution of wedge-shaped micro/nano fiber

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.