Dynamical control of directional nonlinear scattering from metallic nanoantennas by three-dimensional focal polarization orientation

• 作者: WANG Xiang-hui WANG Jian-xin ZENG Ming
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Micro-Nanostructures
• 页码范围: 65-69
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-021-0001-1

摘要

We demonstrate that the directionality of far-field second harmonic(SH)emission generated from individual gold nanosphere can be flexibly engineered by manipulating three-dimensional(3D)focal polarization orientation of the excitation field,which is explained by the coherent interference between SH dipolar and quadrupolar emission modes.The SH dipolar emission mode is independent of the polarization direction of the fundamental field whereas the evolu-tion of the focal polarization orientation can dramatically modify the quadrupolar emission pattern.Therefore,the re-sultant SH emission pattern has a polarization-dependent behavior and side scattering almost perpendicular to the propagation direction of the incident light can be observed under a specific condition.Our findings provide a novel degree of freedom for all-optical control of directional nonlinear scattering from single nanoantenna,thereby opening new possibilities for future potential applications.