| Original Articles |
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WG-Like Modes Selectivity in a Square Cavity with Posts |
| CHEN Qin;HUANG Yong-Zhen |
| State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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| Cite this article: |
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CHEN Qin, HUANG Yong-Zhen 2006 Chin. Phys. Lett. 23 1470-1472 |
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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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Published: 01 June 2006
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| PACS: |
42.55.Px
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(Semiconductor lasers; laser diodes)
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42.55.Sa
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(Microcavity and microdisk lasers)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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