二维光子晶体提高C波段LED出光效率的研究

Research on Enhancement of the Extraction Efficiency of C-Band LED with 2D Photonic Crystals

片上集成光源是未来光电子系统中光源发展的主要趋势,LED光源作为片上集成光源的主要缺点是其出光效率低,二维光子晶体是提高LED出光效率的有效手段。本工作设计了C波段LED的基本结构及参数,并采用时域有限差分法计算了不同阵列不同占空比的二维光子晶体能带结构,利用禁带理论选取提高C波段LED出光效率的最优二维光子晶体结构参数,结果表明三角排列空气孔二维光子晶体晶格常数a=500nm且占空比Rp=0.44的光子晶体结构最优。

On-chip light source is the main development part of the optoelectronic systems in the future.As on-chip light source,the main disadvantage of LED is its low extraction efficiency.Photonic crystal is an efficient method to increase the extraction efficiency of LED.The structure and parameters of the C-band LED was designed and the band gap of the 2D photonic crystals for different arrangement and different ratio was calculated using the finite-difference time-domain（FDTD） method,and then the best structural parameters of the 2D photonic crystals were determined using the method of band gap theory in this paper.Results show that the best structure is air holes PC with a triangular arrangement having a lattice constant of 500 nm and a ratio of 0.44.