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采用时域有限差分方法模拟、分析了woodpile结构中对称型和非对称型立体微腔构建的空间选频器传输特性。该结构在非共面的两波导之间引入对称型和非对称型的立体微腔,提高了器件集成度和空间利用率。模拟结果表明:文中所选类型的微腔,都可以很好的实现选频特性。对同一个非对称性微腔,输出频率会随着微腔的旋转而发生明显的改变。如果引入有效调节机制,可以达到连续调节输出频率的效果。该研究结果为光子晶体光学集成器件的集成化设计提供了新思路和重要的理论指导。
The time-domain finite difference method is used to simulate and analyze the transmission characteristics of the space frequency selector constructed by the symmetric and asymmetric three-dimensional microcavities in the woodpile structure. The structure introduces a symmetric and asymmetric three-dimensional microcavity between the non-coplanar two waveguides to improve device integration and space utilization. The simulation results show that the selected type of microcavities in this paper can achieve good frequency selection. For the same asymmetric microcavity, the output frequency will change significantly with the microcavity rotation. If the introduction of effective adjustment mechanism, you can achieve the effect of continuous adjustment of the output frequency. The results of this study provide new ideas and important theoretical guidance for the integrated design of photonic crystal optical integrated devices.