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设计和制作电激励光子晶体微腔激光器的一个困难是电流的注入问题,而且电流的路径时常会导致微腔的Q值降低。将三维并行时域有限差分方法用于电激励光子晶体单缺陷激光腔研究,给出了微腔的本征模式分布。根据模式特点,选择单极子模式作为研究对象。数值模拟表明,在保持C_(6v)对称性条件前提下,微调最靠近微腔中心的6个空气孔的位置使得单极子模式的光场分布在腔边缘发生缓慢变化可以将单极子模的Q值和Purcell因子提高大约7倍。即激光器阈值可以降低7倍。
One of the difficulties in designing and fabricating an electro-photonic microcavity laser is the current injection problem, and the current path often leads to a decrease in the Q value of the microcavity. The three-dimensional finite-difference time-domain method is applied to study the single-defect laser cavity of electro-photonic crystal, and the eigenmode distribution of the microcavity is given. According to the characteristics of the model, we choose the monopole model as the research object. Numerical simulations show that fine tuning of the positions of the six air holes closest to the center of the microcavity while maintaining the C_ (6v) symmetry makes the distribution of the unipolar mode light field slowly changing at the edge of the cavity. The monopole mode The Q value and Purcell factor increase about 7 times. That is, the laser threshold can be reduced by 7 times.