硅纳米线拉曼光谱的波长选择效应

我们用四种不同波长的激光作为激发源研究硅纳米线的拉曼谱 ,观察到一种反常的现象 ,即拉曼峰的频移、峰宽和非对称系数都依赖于激发光波长。考虑了量子限制效应 ,样品的尺寸分布和共振拉曼散射特性 ,对此反常现象提出了一个合理的解释

A Wavelength Selection Effect on the Raman Spectra of Silicon Nanowire

We have used four different laser wavelengths to measure the Raman spectra of silicon nanowire. Unusual patterns in the Raman shift, linewidth, and asymmetry coefficient are seen as a function of excitation wavelength. Based on the presence of size distribution and the size confinement effect, we propose a reasonable explanation of the behavior and conclude that this phenomenon may be a unique characteristic of the Raman spectra of low dimensional nano scale materials.