论文标题
在双重共振晶格等离激元激发下的第二次谐波产生
Second harmonic generation under doubly resonant lattice plasmon excitation
论文作者
论文摘要
在等离子纳米颗粒阵列中的表面晶格共振，第二次谐波产生增强。我们对由金纳米体组成的二维晶格进行了参数研究，其中中心对称性在倾斜发生率时被打破。我们研究周期性，入射角和线性输入极化对第二次谐波产生的影响。通过改变入射角来实现的基本或第二谐波波长处的表面晶格共振的激发，从而提高了转换效率。作为一种特殊情况，我们证明了两个波长可以在特定晶格的特定时期同时共振。在这种双重谐振情况下，最大的第二次谐波功率将实现。
Second harmonic generation is enhanced at the surface lattice resonance in plasmonic nanoparticle arrays. We carried out a parametric investigation on two-dimensional lattices composed of gold nanobars where the centrosymmetry is broken at oblique incidence. We study the influence of the periodicity, the incidence angle and the direction of the linear input polarization on the second harmonic generation. Excitation of the surface lattice resonance either at the fundamental or second harmonic wavelength, achieved by varying the incidence angle, enhance the conversion efficiency. As a special case, we demonstrate that both the wavelengths can be simultaneously in resonance for a specific period of the lattice. In this double resonant case, maximum second harmonic power is achieved.
