Longitudinal optical phonon-plasmon coupling in luminescent 3C-SiC nanocrystal films
Longitudinal optical phonon-plasmon coupling in luminescent 3C-SiC nanocrystal films
复制标题
发光 3C-SiC 纳米晶体薄膜中的纵向光学声子-等离子体耦合
DOI：
10.1364/ol.35.004024
复制
发表时间：
2010-12-01
期刊：
影响因子：
3.6
通讯作者：
Chu, Paul K.
中科院分区：
文献类型：
--
作者：
Liu, L. Z.;Wang, J.;Chu, Paul K.
具有可调蓝色光致发光的甘油钝化3C-SiC纳米晶体（NC）固体薄膜表现出异常的纵向光学（LO）声子行为。随着NC尺寸的增大，固体薄膜拉曼光谱中的LO声子强度增大，甚至大于横向光学模式的声子强度。拉曼光谱不能仅用声子约束模型拟合。进一步考虑由甘油层表面变形势引起的LO声子与等离子体激元之间的耦合，实验结果与理论结果吻合较好。这表明由表面成键结构产生的耦合LO声子-等离子体效应在修饰的LO声子行为中起着至关重要的作用。(C) 2010年美国光学学会
Glycerol-passivated 3C-SiC nanocrystal (NC) solid films with tunable blue photoluminescence show abnormal longitudinal optical (LO) phonon behavior. As the NC size increases, the LO phonon intensity increases in the Raman spectra of the solid films and is even larger than that of the transverse optical mode. The Raman spectra cannot be fitted by using only the phonon confinement model. When further considering the coupling between the LO phonon and plasmon induced by the surface deformation potential in the glycerol layer, good agreement is achieved between the experiments and theory. This indicates that the coupled LO phonon-plasmon effect arising from the surface bonding structure plays a crucial role in the modified LO phonon behavior. (C) 2010 Optical Society of America