用于实现定向发射的微盘谐振器中模式耦合的研究。

Investigation of mode coupling in a microdisk resonator for realizing directional emission.

作者信息

Yang Yue-De, Wang Shi-Jiang, Huang Yong-Zhen

机构信息

State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083, China.

出版信息

Opt Express. 2009 Dec 7;17(25):23010-5. doi: 10.1364/OE.17.023010.

DOI:10.1364/OE.17.023010

PMID:20052227

Abstract

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.

摘要

对带有输出波导的二维微盘谐振器中的回音壁模式（WGMs）之间的模式耦合进行了数值研究。通过微盘中的模式耦合可以构建等边多边形形状的模式图案，并且耦合模式仍可保持高品质因数（Q 因数）。对于一个直径为 4.5 微米、折射率为 3.2 且连接到一个 0.6 微米宽输出波导的微盘，在 1490 纳米波长处的耦合模式具有约为 10⁴ 的 Q 因数，这比未耦合的 WGMs 的 Q 因数大十倍，并且定义为限制在输出波导中的能量通量与总辐射能量通量之比的输出效率约为 0.65。模式耦合可用于实现高效定向发射微盘激光器。