Beer Sebastian, Gour Jeetendra, Alberucci Alessandro, David Christin, Nolte Stefan, Zeitner Uwe D
Opt Express. 2022 Oct 24;30(22):40884-40896. doi: 10.1364/OE.470578.
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.
在等离子体纳米颗粒阵列的表面晶格共振处，二次谐波产生得到增强。我们对由金纳米棒组成的二维晶格进行了参数研究，在斜入射时该晶格的中心对称性被打破。我们研究了周期性、入射角和线性输入偏振方向对二次谐波产生的影响。通过改变入射角在基波或二次谐波波长处激发表面晶格共振，可提高转换效率。作为一个特殊情况，我们证明了对于晶格的特定周期，两个波长可以同时发生共振。在这种双共振情况下，可实现最大二次谐波功率。
