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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
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)
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
optical devices
light-emitting diode
light extraction efficiency
photonic crystal
surface-microcavity
three-dimensional finite difference time domain method
