Multipolar Third-Harmonic Generation in Fishnet Metamaterials

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• 作者：Lei Wang ; Alexander S. Shorokhov ; Pavel N. Melentiev ; Sergey Kruk ; Manuel Decker ; Christian Helgert ; Frank Setzpfandt ; Andrey A. Fedyanin ; Yuri S. Kivshar ; Dragomir N. Neshev
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：3
• 期：8
• 页码：1494-1499
• 全文大小：521K
• 年卷期：0
• ISSN：2330-4022

文摘

We study the third-harmonic generation from metal–dielectric–metal layered fishnet metamaterials and identify experimentally the multipolar contributions to the generated nonlinear harmonic fields by analyzing the radiation patterns of the emission. We observe that the third harmonic radiated from the fishnet structure is a result of the interference of the electric and magnetic dipoles and the electric quadrupole modes. Our results provide direct evidence of the importance of higher order multipoles in the nonlinear response of fishnet metamaterials, opening new opportunities for enhanced nonlinearities and controlled directionality of nonlinear processes in metamaterials.