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

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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.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2002
Language
English
Article Type
Article
Keywords

EXTERNAL QUANTUM EFFICIENCY; EMITTING-DIODES; SPONTANEOUS EMISSION; MU-M; TEMPERATURE; LASERS

Citation

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, v.8, no.2, pp.231 - 237

ISSN
1077-260X
URI
http://hdl.handle.net/10203/19954
Appears in Collection
PH-Journal Papers(저널논문)
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