正三角形及正方形微光学腔模式特性研究

微谐振腔模式特性研究是利用微腔研制新型光电器件的基础．为了研制出能采用平面工艺制作的定向输出的微腔激光器，文章采用解析和数值模拟方法深入研究了正三角形及正方形光学微腔的模式特性，并得到与数值模拟结果符合非常好的解析场分布及模式波长．对正方形光学微腔，把模式组合成满足正方形对称性的场分布，发现其类WG模式只存在品质因子比它小一个数量级以上的偶然简并模式，因此正方形微腔有利于实现真正的单模工作．

Mode characteristics of equilateral triangle and square optical microresonators

The eigenmodes confined in equilateral triangle and square resonators are analyzed by deriving the mode wavelengths and field distributions, and are numerically simulated by the Finite Difference Time Domain (FDTD) technique. Our analytical results agree very well with those obtained by numerical simulation. In the square resonator, the whispering\|gallery\|like modes have quality factors much higher than other modes, including their randomly degenerate counterparts. Real single mode operation can thus be realized in the square microlaser.