Direct Observation of Optical Field Phase Carving in the Vicinity of Plasmonic Metasurfaces

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• 作者：B. Dagens ; M. Février ; P. Gogol ; S. Blaize ; A. Apuzzo ; G. Magno ; R. Mégy ; G. Lerondel
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：4014-4018
• 全文大小：348K
• 年卷期：0
• ISSN：1530-6992

文摘

Plasmonic surfaces are mainly used for their optical intensity concentration properties that allow for enhancement of physical interaction like in nonlinear optics, optical sensors, or tweezers. Phase response in plasmonic resonances can also play a major role, especially in a periodic assembly of plasmonic resonators like metasurfaces. Here we show that localized surface plasmons collectively excited by a guided mode in a metallic nanostructure periodic chain present nonmonotonous phase variation along the 1D metasurface, resulting from both selective Bloch mode coupling and dipolar coupling. As shown by near-field measurements, the phase profile of the highly concentrated optical field is carved out in the vicinity of the metallic metasurface, paving the way to unusual local optical functions.