| WG-Like Modes Selectivity in a Square Cavity with Posts |
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| 作者姓名： | 陈沁 黄永箴 |
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| 作者单位： | State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PC Box 912, Beijing 100083 |
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| 基金项目： | 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. |
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| 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.
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| 关 键 词： | 正方腔体 二维有限差分时域技术 有效索引法 最优结构 |
| 收稿时间： | 2005-10-01 |
| 修稿时间： | 2005-10-01 |
WG-Like Modes Selectivity in a Square Cavity with Posts |
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| CHEN Qin,HUANG Yong-Zhen.WG-Like Modes Selectivity in a Square Cavity with Posts[J].Chinese Physics Letters,2006,23(6):1470-1472. |
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| Authors: | CHEN Qin HUANG Yong-Zhen |
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| Institution: | State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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| Abstract: | 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. |
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| Keywords: | 42 55 Px 42 55 Sa 42 60 Da |
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