Square microdisks with round corners are fabricated using a standard GaN-based blue LED on Si substrates. Whispering gallery-like modes in the square microdisks are investigated by finite-difference time-domain simulation. The simulation results reveal that the round corners in square microdisks can substantially suppress the number of light propagation paths and further reduce the number of optical modes. A confocal micro-photoluminescence is performed to analyze the optical properties of the square microdisks at room temperature. The single-mode dominant resonant emission is obtained in the square microdisk with corner radius of 1.5 μ m.

中文翻译：

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Si上基于GaN的方形微盘中单模主导共振发射的方法

使用标准的基于GaN的蓝色LED在Si基板上制造带有圆角的方形微盘。通过有限差分时域仿真研究了方形微盘中的回音壁状模式。仿真结果表明，方形微盘中的圆角可以实质上抑制光传播路径的数量，并进一步减少光学模式的数量。进行共聚焦微光致发光以分析方形微盘在室温下的光学性质。在方角半径为1.5μm的方形微型磁盘中获得单模主导共振发射。