优化电激励光子晶体单缺陷激光腔结构

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。

Optimization for Electrically Driven Single-Cell Photonic Crystal Laser Cavity

The current injection is a daunting problem in designing and fabricating electrically driven single-cell photonic crystal microcavity laser,and the current path often decreases the quality factor of the microcavity.The electrically driven single-cell photonic crystal microcavity laser is studied with three-dimensional finite-difference time-domain.The eigen mode distribution of the microcavity is given,and accordingly the monopole mode is chosen and investigated.Numerical simulation shows that,under the condition of C_(6V) symmetry,the positions micro-tuning of the six poles nearest the cavity center will result in slow change of the optical field of the monopole mode in the cavity marigin.The quality factor and Purcell factor are raised 7 times,and the laser threshold decreases to one seventh of the original value.