摘要
提出了一种用于计算具有光子晶体(PCs)图案的多层结构的面光源模型。此模型是基于多层散射法的计算方法,可处理二维无限大的光子晶体层结构。与传统的采用点光源作为器件辐射光源不同的是,把器件的发光近似看作由无穷多个点偶极子组成的面辐射源,这种面光源模型与真实的面辐射器件,如发光二极管(LED),有机发光二极管(OLED)等的辐射机制相近,可得到更接近真实的发光特性。基于这个模型,计算了具有二维光子晶体图案的LED器件的发光特性。二维正方晶格和三角晶格光子晶体表面的LED的辐射的角分布光谱表明,具有光子晶体表面发光器件的出光有明显的增强。与传统的点偶极子模型的计算结果比较,面光源模型得到光谱的共振峰的强度较小,出光的空间分布也有所不同。两种模型结果不同,在三角晶格LED结构中尤为明显。对于LED卒取效率的计算同样表明,面光源得到的三角晶格结构卒取效率要比点光源的结果略低。
A planar source treatment for the multilayer emitter which is different from the traditional point dipole one.With this treatment,the emission spectra for multilayer emitter with two-dimensional photonic crystal pattern was investigated.Spectra of variety coupling angles in the case of square lattice and triangular lattice are calculated,respectively.Compared with the unpatterned structure,efficient enhancement of emission coupling in photonic crystal structure is demonstrated.A comparison with traditional point dipole treatment show different coupling strength at the resonance and different emission feature in large coupling angle,especially for triangular lattice.The calculations of extraction efficiency by the two treatments produce very different results in the case of triangular lattice.
出处
《半导体技术》
CAS
CSCD
北大核心
2008年第S1期231-234,共4页
Semiconductor Technology
