一种基于液晶光子晶体的可调谐滤波器

A Tunable Filter Based on Liquid-Crystal Photonic Crystal

在由高纯硅和5CB液晶组成的光子晶体中,掺杂一装有电极的5CB液晶层作为调制层,由此构成了一可调滤波器。利用传输矩阵法计算了其透射谱,结果表明:控制调制层上电压有无,使调制层的折射率发生变化,就可以实现透射峰中心的移动,从而达到滤波波长可调的目的。该滤波器的结构周期以6至7为宜,且有一定的角度宽容性,特别适合小角度入射的情况。

The photonic crystal composed of high-purity silicon and 5CB liquid-crystal,modulated by the 5CB liquid crystal layer equipped with electrodes,which constitute a photonic crystal tunable filter.Transmission spectrum was calculated by transfer matrix method,the results indicate that the center of the transmission peaks can be moved when the refractive index of the modulation layer was changed by controlling voltage of the modulation layer,which can be used to adjust the wavelength of the filter tunable.The filter cycle of 6 to 7 is appropriate,and there is a certain angle tolerance,therefore it is suitable for the case of a small incident angle.