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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,由此构成了一针对特定波长(900 nm)的光子晶体开关。利用传输矩阵计算了其透射谱,结果表明:控制调制层上电压的有无就可以实现透射峰中心的移动,从而达到该开关的通断,当调制电压小于5 V,还可以准确控制透射峰的中心位置。周期数增加,透射峰的中心位置保持不变,但其半峰全宽度变窄。该开关的结构周期以6~7为宜,且有一定的角度宽容性,特别适合小角度入射的情况。这些现象为此类光子晶体实现高频开关提供了理论指导。
In a photonic crystal composed of high purity silicon and 5CB liquid crystal, a 5CB liquid crystal layer with an electrode is doped as a modulation layer, thereby forming a photonic crystal switch for a specific wavelength (900 nm). The transmission spectra were calculated using the transmission matrix. The results show that the transmission peak center can be achieved by controlling the voltage on the modulation layer to achieve on-off of the switch. When the modulation voltage is less than 5 V, the transmission peak can be accurately controlled Central location. The number of cycles increases, the center of the transmission peak remains unchanged, but the full width at half maximum decreases. The structure of the switch cycle 6 to 7 is appropriate, and have a certain degree of tolerance, especially for small-angle incident. These phenomena provide theoretical guidance for high-frequency switching of such photonic crystals.