Geometric effect on second harmonic generation from gold grating
Geometric effect on second harmonic generation from gold grating
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DOI：
10.1016/j.optcom.2018.01.052
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发表时间：
2018-05
影响因子：
2.4
通讯作者：
Jiao Lu;B. Ding;Y. Huo;T. Ning
中科院分区：
文献类型：
--
作者：
Jiao Lu;B. Ding;Y. Huo;T. Ning
我们数值研究了理想矩形和梯形截面金光栅的二次谐波产生。梯形截面的金光栅的倍频效率比理想矩形截面的金光栅的倍频效率显著提高，最大增强因子约为2。增强归因于纳米结构依赖的局部基波电场，非线性源，从而远场辐射。我们的结果对解释实验上的二次谐波测量以及金属纳米结构中二次谐波响应的调制具有实际意义。
We numerically investigate second harmonic generation from gold gratings of an ideal rectangular and ladder-shaped cross-section. The SHG efficiency from the gold gratings of the ladder-shaped cross-section is significantly enhanced compared with that from the ideal rectangular cross-section with a maximum enhancement factor of around two. The enhancement is ascribe to the nanostructure dependent local fundamental electric field, the nonlinear sources and thus the far field radiation. Our results have a practical meaning in the explanation of experimental SHG measurement, and the modulation of SHG response in the metallic nanostructure.