摘要
有限时域差分(FDTD)广泛应用于提高发光二极管(LED)芯片外量子效率。这种方法是针对波导结构的一种分析计算,对于激光器是有效的,但是对LED很难模拟其有源层多种模式出射的情况。应用有限元电磁场分析方法对LED进行光学建模并对光子晶体结构的外量子效率进行了计算。特别在对光源的处理上,使用了点光源球面波来进行分析并且考虑了光源的相干性。由于计算的复杂程度,对模型进行了简化处理。把光子晶体结构的实验数据与仿真结果进行了对比,验证了模型的正确性。
A lot of efforts have been dedicated to improve the external quantum efficiency of LED chips for many years. Finite difference time domain （FDTD） is widely used for this problem. FDTD is efficient for laser diode analysis due to its wave guide analysis method. However, in LEDs, multi modes are emitted from active layer and can＇t be treated by FDTD. In this paper, finite elemental method （FEM） is applied to simulate the propagation of LED. Noted that point spherical wave is applied and coherence of light source is also considered. The model is finally simplified for convenience of calculation. An experiment of LED based on photon crystal （PHC） structure is simulated to verify the model.
出处
《光学与光电技术》
2011年第2期54-57,共4页
Optics & Optoelectronic Technology
