Ultrafast Plasmonic Control of Second Harmonic Generation

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• 作者：Roderick B. Davidson II ; Anna Yanchenko ; Jed I. Ziegler ; Sergey M. Avanesyan ; Benjamin J. Lawrie ; Richard F. Haglund Jr.
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：3
• 期：8
• 页码：1477-1481
• 全文大小：465K
• 年卷期：0
• ISSN：2330-4022

文摘

Efficient frequency conversion techniques are crucial to the development of plasmonic metasurfaces for information processing and signal modulation. In principle, nanoscale electric-field confinement in nonlinear materials enables higher harmonic conversion efficiencies per unit volume than those attainable in bulk materials. Here we demonstrate efficient second-harmonic generation (SHG) in a serrated nanogap plasmonic geometry that generates steep electric field gradients on a dielectric metasurface. An ultrafast control pulse is used to control plasmon-induced electric fields in a thin-film material with inversion symmetry that, without plasmonic enhancement, does not exhibit an even-order nonlinear optical response. The temporal evolution of the plasmonic near-field is characterized with ∼100 as resolution using a novel nonlinear interferometric technique. The serrated nanogap is a unique platform in which to investigate optically controlled, plasmonically enhanced harmonic generation in dielectric materials on an ultrafast time scale. This metamaterial geometry can also be readily extended to all-optical control of other nonlinear phenomena, such as four-wave mixing and sum- and difference-frequency generation, in a wide variety of dielectric materials.