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在实芯光子晶体光纤的周期排列的空气孔包层中,填充高折射率液晶介质,使其形成光子带隙。由于填充后低折射率的纤芯周围分布着高折射率液晶棒,光子晶体光纤的横向因布拉格反射而形成了许多传输带,呈现多通道滤波特性。基于光子带隙理论,利用平面波展开法对填充液晶前后光子晶体光纤传导机制的转变进行了探讨,研究了填充液晶对光子晶体光纤滤波性能的影响。结果表明,当电场增大时,滤波通道中心向长波方向移动,滤波通道带宽增大;而对于相同的外加电场,随着液晶折射率的逐渐增大,滤波特性与电场增大情况类似,光子带隙开始向长波方向漂移,同时带隙的宽度也逐渐变大。
In the periodically arranged air-hole cladding of the solid photonic crystal fiber, a high refractive index liquid crystal medium is filled to form a photonic band gap. Due to the high refractive index liquid crystal rods distributed around the core of the low refractive index after filling, a large number of transmission bands are formed due to Bragg reflection in the lateral direction of the photonic crystal fiber, exhibiting multi-channel filtering characteristics. Based on photonic bandgap theory, the transformation of conduction mechanism of PCF before and after filled with liquid crystal was studied by plane wave expansion method. The effect of liquid crystal filling on the performance of photonic crystal fiber was studied. The results show that when the electric field increases, the center of the filter channel moves to the longwave direction, and the bandwidth of the filter channel increases. For the same applied electric field, with the increase of the refractive index of the liquid crystal, the filtering characteristics are similar to the increase of the electric field. Band gap began to drift to the long wave direction, while the band gap width also gradually becomes larger.