提出了一种二维三角晶格光子晶体“或非”和“非”全光逻辑门设计。该设计使用空气中的硅介质柱光子晶体材料, 其主体为四根光子晶体波导组成的四端口结构。通过平面波展开法和有限时域差分法计算了其能带结构和光学传输特性, 并对其逻辑功能进行了分析。结果显示, 通过控制光相位, 该结构能够实现“或非”和“非”逻辑功能, 结构尺寸为9.675μm×7.820μm, 响应周期为0.388ps。

A design of all-optical NOR and NOT logic gates based on two-dimensional triangular lattice photonic crystal are proposed. The design is composed of silicon rods in air, and the main part is four photonic crystal waveguides with four ports. The proposed structure was simulated by using plane wave expansion method and finite difference time domain, and the photonic band structure as well as the optical transmission characteristics were calculated. Simulation results show that the proposed all-optical structure can realize the function of NOR and NOT logic gate with the response period of 0.388ps. The area of the proposed structure is only 9.675μm×7.820μm.