表面微腔光子晶体LED的光提取特性  

Characteristics of Light Extraction for Surface-Microcavity Photonic Crystal LED

作　　者：胡永禄 刘道柳[1] 王博[1] 吴俊芳[1] 李潮[1] 

机构地区：[1]华南理工大学物理与光电学院,广东广州510640

出　　处：《光学学报》2017年第6期233-238,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11304099);广东省自然科学基金(s2013040015639)

摘　　要：提出并研究了一种基于表面微腔光子晶体的发光二极管(LED),利用多个谐振腔出射光之间的相干耦合作用产生束流准直效应,从而在提高光提取效率的同时,也改善了出射光的空间指向性。通过对表面光子晶体LED结构进行优化设计,使得表面微腔光子晶体LED的光提取效率较完整光子晶体LED提高了77.3%,而较普通平板LED提高了1.8倍以上。同时,微腔光子晶体LED相对普通平板LED和完整光子晶体LED来说具有更加明显的远场能量汇聚效应,让出射光具有更好的空间指向性。In this paper,we propose and study a light-emitting diode（LED）based on the surface-microcavity photonic crystal（PC）.The beaming-collimation effect is generated by the coherent-coupling interaction of the emergent light from the multiple resonant cavities.As a result,the light extraction efficiency of LED is improved,as well as the spatial directivity of emergent light.By optimizing the structure of the surface PC LED,the light extraction efficiency of the surface-microcavity PC LED is 77.3% higher than that of the prefect PC LED,and 1.8times higher than that of the normal slab LED.Simultaneously,the proposed surface-microcavity PC LED has more obvious far-field energy converging effect than prefect PC LED and normal slab LED.This feature ensures the emergent light with better spatial directivity.

关 键 词：光学器件 发光二极管 光提取效率 光子晶体 表面微腔 三维时域有限差分法 

分 类 号：O472.3[理学—半导体物理] TN312.8[理学—物理]