Investigation of mode coupling in a microdisk resonator for realizing directional emission.
Investigation of mode coupling in a microdisk resonator for realizing directional emission.
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DOI：
10.1364/oe.17.023010
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发表时间：
2009-12
期刊：
影响因子：
3.8
通讯作者：
Yuede Yang;Shi-jiang Wang;Yongzhen Huang
中科院分区：
文献类型：
--
作者：
Yuede Yang;Shi-jiang Wang;Yongzhen Huang
数值研究了带输出波导的二维微盘谐振器中回音壁模之间的模式耦合。在微盘中通过模式耦合可以构造出等多边形的模式图案，并且耦合后的模式仍能保持较高的品质因子。对于直径为4.5 μ m、折射率为3.2的微盘连接到0.6 μ m宽的输出波导，在1490 nm波长处的耦合模具有10（4）量级的Q因子，其是未耦合WGM的Q因子的10倍，并且定义为限制在输出波导中的能通量与总辐射能通量之比的输出效率约为0.65。利用这种模式耦合可以实现高效率的定向发射微盘激光器。
Mode coupling between the whispering-gallery modes (WGMs) is numerically investigated for a two-dimensional microdisk resonator with an output waveguide. The equilateral-polygonal shaped mode patterns can be constructed by mode coupling in the microdisk, and the coupled modes can still keep high quality factors (Q factors). For a microdisk with a diameter of 4.5 microm and a refractive index of 3.2 connected to a 0.6-microm-wide output waveguide, the coupled mode at the wavelength of 1490 nm has a Q factor in the order of 10(4), which is ten times larger than those of the uncoupled WGMs, and the output efficiency defined as the ratio of the energy flux confined in the output waveguide to the total radiation energy flux is about 0.65. The mode coupling can be used to realize high efficiency directional-emission microdisk lasers.