表面等离子体共振型光子晶体光纤偏振滤波器性能优化设计方法

以一种常见的光子晶体光纤为载体,利用金属填充物和纤芯周围折射率环境结构的不对称性,提出了一种基于表面等离子体共振效应的光子晶体光纤偏振滤波器性能优化设计方法.研究发现,通过对光子晶体光纤纤芯和金属填充物周围结构的特殊设计,可有效调控周围材料的有效折射率,以实现金属等离子体模式的双折射效应和光纤纤芯模式的双折射特性.因此,当纤芯模式和金属的表面等离子体模式满足相位匹配条件时,即可达到偏振滤波的效果,并获得很好的消光比,而不需要对光子晶体光纤的结构进行复杂设计,降低了器件制备难度,避免了所设计的光纤结构无法实现实际制备的问题.

Optimization design method of surface plasmon resonance based photonic crystal fiber polarization filter

In this paper, a method for optimizing the performance of photonic crystal fiber (PCF)polarization filter based on the surface plasmon resonance (SPR) effect was proposed. The method was realized by using the asymmetry of the metal filler and the refractive index environment around the core. The study shows that the effective refractive index of the surrounding materials could be effectively controlled by the special design features of the core and metal filler of the photonic crystal fiber to realize the birefringence effect of the metal plasma mode and the birefringence of the core mode of the fiber. Therefore, when the core mode and metal surface plasmon mode satisfy the phase matching conditions, the polarization filtering effect could be achieved, and a good extinction ratio could be obtained without complex structure design of the photonic crystal fiber, which reduced the difficulty of device preparation and solved the problem that the designed fiber structure could not realize the actual preparation.