Silicon nanocrystal-based photonic crystal slabs with broadband and efficient directional light emission

被引:14
作者
Ondic, L. [1 ]
Varga, M. [1 ]
Pelant, I. [1 ]
Valenta, J. [2 ]
Kromka, A. [1 ]
Elliman, R. G. [3 ]
机构
[1] Acad Sci Czech Republ, Inst Phys, Vvi, Cukrovarnicka 10, Prague 16200 6, Czech Republic
[2] Charles Univ Prague, Fac Math & Phys, Dept Chem Phys & Opt, Ke Karlovu 3, CR-12116 Prague 2, Czech Republic
[3] Australian Natl Univ, Res Sch Phys & Engn, Canberra, ACT 2601, Australia
来源
SCIENTIFIC REPORTS | 2017年 / 7卷
关键词
HIGH EXTRACTION EFFICIENCY; QUANTUM CONFINEMENT; EMITTING-DIODES; PHOTOLUMINESCENCE; LUMINESCENCE; AMPLIFICATION; ENHANCEMENT; TEMPERATURE; MODES; DOTS;
D O I
10.1038/s41598-017-05973-y
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Light extraction from a thin planar layer can be increased by introducing a two-dimensional periodic pattern on its surface. This structure, the so-called photonic crystal (PhC) slab, then not only enhances the extraction efficiency of light but can direct the extracted emission into desired angles. Careful design of the structures is important in order to have a spectral overlap of the emission with extraction (leaky) modes. We show that by fabricating PhC slabs with optimized dimensions from silicon nanocrystals (SiNCs) active layers, the extraction efficiency of vertical light emission from SiNCs at a particular wavelength can be enhanced similar to 11 times compared to that of uncorrugated SiNCs-rich layer. More importantly, increased light emission can be obtained in a broad spectral range and, simultaneously, the extracted light can stay confined within relatively narrow angle around the normal to the sample plane. We demonstrate experimentally and theoretically that the physical origin of the enhancement is such that light originating from SiNCs first couples to leaky modes of the PhCs and is then efficiently extracted into the surrounding.
引用
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页数:8
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