Nature of sub-band gap luminescent eigenmodes in a ZnO nanowire
Nature of sub-band gap luminescent eigenmodes in a ZnO nanowire
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DOI：
10.1021/nl0721867
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发表时间：
2008-01-01
期刊：
影响因子：
10.8
通讯作者：
Vanmaekelbergh, D.
中科院分区：
文献类型：
--
作者：
Ruhle, S.;van Vugt, L. K.;Vanmaekelbergh, D.
单个高质量ZnO纳米线的发射光谱由远低于ZnO带隙的一系列Fabry-Perot型本征模组成。空间分辨发光光谱表明，光发射主要在两个线端，具有相同的光谱反射驻波极化激元本征模。模式的强度随着激发强度的增加而超线性增加，表明模式的布居是由极化激元之间的散射决定的。由于强烈的光-物质相互作用，来自ZnO纳米线的光发射不由ZnO的电子能带图决定，而是还取决于线的几何形状和激发强度。离域极化激元提供了一个自然的解释，在ZnO线，已报道的明显的亚波长的指导。
The emission spectrum of individual high-quality ZnO nanowires consists of a series of Fabry-Perot-like eigenmodes that extend far below the band gap of ZnO. Spatially resolved luminescence spectroscopy shows that light is emitted predominantly at both wire ends, with identical spectra reflecting standing wave polariton eigenmodes. The intensity of the modes increases supralinearly with the excitation intensity, indicating that the mode population is governed by scattering among polaritons. Due to strong light-matter interaction, light emission from a ZnO nanowire is not dictated by the electronic band diagram of ZnO but depends also on the wire geometry and the excitation intensity. Delocalized polaritons provide a natural explanation for the pronounced subwavelength guiding in ZnO wires that has been reported previously.