WG-Like Modes Selectivity in a Square Cavity with Posts  

作　　者：陈沁 黄永箴 

机构地区：[1]State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PC Box 912, Beijing 100083

出　　处：《Chinese Physics Letters》2006年第6期1470-1472,共3页中国物理快报（英文版）

基　　金：Supported by the National Nature Science Foundation of China under Grant No 60225011, and the Hi-Tech Research and Development Program of China under Grant No 2003AA311070.

摘　　要：We investigate the characteristics of Whispering-Gallery（WG）-like modes in a square cavity with posts by employing the two-dimensional （2D） finite-difference time-domain （FDTD） technique combined with the effective index method. The results indicate that the posts can result in mode selection in the WG-like modes. The WG-like modes with odd mode numbers are not much sensitive to the sizes of the posts. However, the quality factor （i.e. Q-factor） of the WG-like modes with even mode numbers decreases sharply with the increasing size of the posts. The decreasing Q-factor is attributed to mode leakage and scattering loss due to the presence of the post. The mode selection increases the mode spacing of square cavity twice in an optimized structure.We investigate the characteristics of Whispering-Gallery（WG）-like modes in a square cavity with posts by employing the two-dimensional （2D） finite-difference time-domain （FDTD） technique combined with the effective index method. The results indicate that the posts can result in mode selection in the WG-like modes. The WG-like modes with odd mode numbers are not much sensitive to the sizes of the posts. However, the quality factor （i.e. Q-factor） of the WG-like modes with even mode numbers decreases sharply with the increasing size of the posts. The decreasing Q-factor is attributed to mode leakage and scattering loss due to the presence of the post. The mode selection increases the mode spacing of square cavity twice in an optimized structure.

关 键 词：QUALITY FACTOR MICROCAVITIES RESONATORS EMISSION 

分 类 号：O562[理学—原子与分子物理]