Ultrafast Optical Modulation of Second- and Third-Harmonic Generation from Cut-Disk-Based Metasurfaces

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• 作者：Giovanni Sartorello ; Nicolas Olivier ; Jingjing Zhang ; Weisheng Yue ; David J. Gosztola ; Gary P. Wiederrecht ; Grégory Wurtz ; Anatoly V. Zayats
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：3
• 期：8
• 页码：1517-1522
• 全文大小：521K
• 年卷期：0
• ISSN：2330-4022

文摘

We design and fabricate a metasurface composed of gold cut-disk resonators that exhibits a strong coherent nonlinear response. We experimentally demonstrate all-optical modulation of both second- and third-harmonic signals on a subpicosecond time scale. Pump–probe experiments and numerical models show that the observed effects are due to the ultrafast response of the electronic excitations in the metal under external illumination. These effects pave the way for the development of novel active nonlinear metasurfaces with controllable and switchable coherent nonlinear response.