Structural discontinuity induced surface second harmonic generation in single, thin zinc-blende GaAs nanowires
Structural discontinuity induced surface second harmonic generation in single, thin zinc-blende GaAs nanowires
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单根细闪锌矿 GaAs 纳米线中结构不连续性引起的表面二次谐波产生
DOI：
10.1039/c7nr04627h
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发表时间：
2017
期刊：
影响因子：
6.7
通讯作者：
Siyuan Yu
中科院分区：
文献类型：
--
作者：
Yu-Ming Wei;Ying Yu;Jing Wang;Lin Liu;Hai-Qiao Ni;Zhi-Chuan Niu;Jun-Tao Li;Xue-Hua Wang;Siyuan Yu
我们研究了单个自催化闪锌矿(ZB)GaAs纳米线(NW)的光学二次谐波产生(SHG)，其中偏振度强烈地依赖于NW直径。我们报道了在单个超薄的GaAsNW中直接观察到由表面非线性极化率引起的倍频效应。通过在我们的理论模型中同时考虑光场和结构不连续性的贡献，我们可以很好地解释不同直径的原子核的光学倍频偏振。我们还证明了由退偏电磁场产生的光学入耦合系数可以决定倍频的偏振。这些结果为进一步从几何角度研究小纳米结构中倍频效应的来源和控制开辟了新的前景。
We investigate optical second harmonic generation (SHG) from individual self-catalyzed zinc-blende (ZB) GaAs nanowires (NWs), where the polarimetry strongly depends on the NW diameter. We report a direct observation on the SHG induced by surface nonlinear susceptibilities in a single, ultra-thin GaAs NW. By considering the contributions from both optical field and structural discontinuities in our theoretical model, we can well explain the optical SHG polarimetry from NWs with different diameters. We also show that the optical in-coupling coefficient arising from the depolarization electromagnetic field can determine the polarization of the SHG. The results open perspectives for further geometry-based studies on the origin and control of SHG in small nanostructures.