Enhancement of light extraction from two-dimensional photonic crystal slab structures

被引:80
作者
Ryu, HY [1 ]
Hwang, JK [1 ]
Lee, YJ [1 ]
Lee, YH [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea
关键词
extraction efficiency; finite-difference time-domain method; InGaAsP quantum well; photoluminescence; photonic crystal slab;
D O I
10.1109/2944.999175
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Efficient light extraction from various two-dimensional photonic crystal slab structures is studied. By using the finite-difference time-domain method, effects of finite air-hole depth, and the cladding refractive index on the light extraction efficiency are investigated. The largest extraction efficiency is obtained in the photonic crystal slab with entirely drilled air hole patterns and large index contrast with the bottom cladding. Using InGaAsP quantum wells emitting at 1.5 mum large enhancement of photoluminescence is observed from the slab structures with air-hole patterns fully transferred through the active medium and the bottom cladding. The photoluminescence enhancement relative to the as-grown wafer is similar to8 in the oxide-supported slab and similar to13 in the free-standing slab. The large light extraction enhancement results from the coupling to leaky modes above the light line of a band structure. In addition, the extraction behaviors of a triangular lattice and a square lattice are compared, and it is shown that their distinctive extraction characteristics well reflect the features of each band structure.
引用
收藏
页码:231 / 237
页数:7
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