二维光子晶体波导及耦合器的特性模拟

Property Simulations on Two-Dimensional Photonic Crystal Waveguide and Coupler

用平面波展开法计算二维光子晶体的能带结构,作为进一步研究光子晶体器件的基础。接着采用时域有限差分法(FDTD)模拟光波在光子晶体直角转折传播的场图以及光波在两条平行光子晶体波导间传播时的耦合场图。模拟结果显示,光波在直角转弯光子晶体中波导中传播时的损耗非常低;在平行光子晶体波导耦合器中的耦合损耗仅也很低。它们的优异性能在光子晶体集成电路中有极大的应用价值。

As the foundation of studying two dimensional photonic crystal circuits, Plant Wave Expansion (PWE) Method is used to calculate band gap structure of two dimensional photonic crystals. Then the numerical calculations of light propagation in Photonic crystal wave guides with two right-angle bends and photonic crystal coupler are presented by making use of the method of Finite Difference Time Domain (FDTD). The results indicate that the losses of the two circuits are very low. They can find a wide application in photonic integrate circuits (PCI).