金涂覆光子晶体光纤偏振滤波器的特性分析

设计了一种基于表面等离子体共振的光子晶体光纤偏振滤波器.在空气孔中选择性金涂覆使表面等离子体模式与纤芯模式共振.利用有限元法分析了改变结构参数对滤波器性能的影响.数值模拟结果表明金薄膜厚度和空气孔直径能够优化表面等离子体模式及纤芯模式的共振峰位置和强度，在波长1.31μm 处x偏振方向的损耗到达740.5dB/cm，y偏振方向的损耗很低且x，y方向的损耗峰明显地被分开.利用这些特性设计出一种新型的工作在通信波段的光子晶体光纤偏振滤波器.

Characteristic Analysis of Gold-Coated Photonic Crystal Fiber Polarization Filter

A photonic crystal fiber polarization filter based on surface plasmon resonance is proposed and investigated. The gold is coated into the selected air holes in order to make surface plasmon modes and core modes resonate. The finite element method is used to analyze the effect on the filter performance by changing the parameters. Numerical simulation results show that the positions of resonance peaks and the resonance strength of core mode and surface plasmon mode can be well adjusted by changing the thickness of gold film and diameter of air holes. The confinement loss in x-polarization can reach to 740.5dB/cm at 1.31μm， the confinement loss in y-polarization is very low， and the loss peaks in x-polarization and y-polarization are separated by a large distance. Then a novel kind of photonic crystal fiber polarization filter working at the communication wavelength is designed.