为了解决光子晶体波导出射端光场控制, 同时解决二维三角晶格光子晶体波导出射光辐射困难的问题。利用二维三角晶格光子晶体设计了一种新型光子晶体波导出射口结构。在二维三角晶格光子晶体波导出射端引入两个微腔, 通过光波与微腔发生共振, 形成类似于三个点光源干涉的出射光, 同时进一步提出波导出射端喇叭口干涉出射光定向辐射的设计。通过这种微腔喇叭口设计, 利用时域有限差分法分析结果表明光波实现很好的定向辐射, 并且辐射距离显著提高。

To control the light field at the exit end of the photonic crystal waveguide, it is difficult to overcome the radiation of the emitted light from the two-dimensional triangular lattice photonic crystal waveguide. A new type photonic crystal waveguide exit structure was designed using a two-dimensional triangular lattice photonic crystal. Two types of microcavities are introduced at the exit end of a two-dimensional triangular lattice photonic crystal waveguide. Light waves and the microcavity are resonated to form an exit light that is similar to the interference of three point light sources. An exit end bell design is further proposed. Analysis using time-domain finite-difference method shows that the light wave achieves good directional radiation and the radiation distance is significantly improved with the design of the microcavity bell mouth. This kind of photonic crystal device has great significance for the high efficiency coupling with other devices, and has potential application value in photoelectric integration and near-distance optical research.