二维光子晶体可调谐光能量分配器研究

Study on the Tunable Optical Power Distributor Based on Two-dimensional Photonic Crystal

在四方晶格排列的二维光子晶体中移除一排介质棒形成线缺陷波导,在线缺陷波导的下方引入点缺陷.采用基于时域有限差分技术(FDTD)的数值模拟方法分析光波在两个通道中的透射特性,发现点缺陷可以选择特定频率的光波导通.当在点缺陷区域引入克尔非线性并选择具有一定频率失谐的光波入射时,从点缺陷波导输出的光透射率会随光功率的增大而增加,从而实现两个通道分光比的任意分配.该结论为设计光能量分配器提供了理论依据.

In two-dimensional photonic crystal with square lattice, one-line defect waveguides are formed by removing a row of dielectric, a point defect are introduced below the line defect waveguide. The simulations based on the finite-difference time-domain technique （FDTD） are employed to analyze the transmission characteristics of light in the two channels. The results show that the point defects can transmit light with specific frequency. When introducing Kerr nonlinearity in point defect area, choosing the light with a certain frequency detuning, it is found that the transmittance from the point defect waveguide will increase with the increasing of the light power. Finally, the splitting ratio of two channels can be arbitrary distribution. This conclusion provides a theoretical ba- sis for the design of optical power distributor.