基于二维光子晶体点缺陷可调谐光功率分配器

Tunable Optical Power Splitter Based on the Point Defects of Two-Dimensional Photonic Crystal

在二维矩形阵列结构硅光子晶体中去除中间一排硅柱形成线波导,在线波导右侧引入点缺陷。利用时域有限差分法(FDTD)模拟仿真以及数值分析研究线波导中光耦合特性,计算出两个通道的分光比,发现改变光子晶体的温度可以明显改变这两个通道的光功率比。基于此结构,提出了一种新的光功率分配器,可以获得大范围的光功率比值,从1∶1～90∶1都可以通过改变光子晶体的温度来实现,并且当温度从0℃～200℃就可以实现这一功能,最后设计了一款三通道可调谐光功率分配器,通过调节两个点缺陷区域内温度来实现光功率的分配。

In two-dimensional rectangular array photonic crystal, one parallel line waveguides are formed by removing the middle line silicon pillars. On the right of the line waveguide, a point waveguide has been introduced. It＇s coupling properties are investigated by use of finite-difference time-domain （FDTD） method and the splitting ratio of two channels has been counted. The results show that the splitting ratio changes obviously is found when the temperature of the photonic crystal is rising. A new optical power splitter is brought forward based on this research and a wide range of light power ratios, from 1：1 to 90：1 can be obtained. This function can be realized by regulating the temperature from 0 ℃ to 200 ℃. Finally a three channels and tunable optical power splitter is designed, which can distribute the power of the light by adjusting the two point defects＇ temperature.