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提出了一种利用自准直效应基于TM模式二维光子晶体的1×5光分束器。该结构由两个环形谐振腔级联而成,每个环形谐振腔有4个可改变介质柱半径的分光镜。首先运用多光束干涉原理分析光分束器中各个端口的透射谱,按照设置的比例对8个分光镜进行合适的组合,自准直光束即可从5个出口出射,达到1×5分束器的效果;然后利用时域有限差分软件方法来对数值进行模拟,其结果和理论值吻合地较好。该结构尺寸较小,自由光谱范围大,在未来的高密度集成光路中会有较好的应用前景。
A 1 × 5 beam splitter based on TM mode two-dimensional photonic crystal using self-collimation effect is proposed. The structure consists of two ring resonator cascade, each ring resonator has four can change the radius of the dielectric beam splitter. First of all, the principle of multi-beam interference is used to analyze the transmission spectrum of each port in the beam splitter. According to the set ratio, 8 beam splitters are properly combined. The collimated beam can exit from 5 outlets and reach a 1 × 5 beam splitter Then, the numerical simulation is carried out by using the finite difference time domain software, and the result is in good agreement with the theoretical value. The structure of small size, free spectral range, in the future high-density integrated optical path will have a better application prospects.