Looking into Meta-Atoms of Plasmonic Nanowire Metamaterial

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• 作者：Kun-Tong Tsai ; Gregory A. Wurtz ; Jen-You Chu ; Tian-You Cheng ; Huai-Hsien Wang ; Alexey V. Krasavin ; Jr-Hau He ; Brian M. Wells ; Viktor A. Podolskiy ; Juen-Kai Wang ; Yuh-Lin Wang ; Anatoly V. Zayats
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：September 10, 2014
• 年：2014
• 卷：14
• 期：9
• 页码：4971-4976
• 全文大小：394K
• ISSN：1530-6992

文摘

Nanowire-based plasmonic metamaterials exhibit many intriguing properties related to the hyperbolic dispersion, negative refraction, epsilon-near-zero behavior, strong Purcell effect, and nonlinearities. We have experimentally and numerically studied the electromagnetic modes of individual nanowires (meta-atoms) forming the metamaterial. High-resolution, scattering-type near-field optical microscopy has been used to visualize the intensity and phase of the modes. Numerical and analytical modeling of the mode structure is in agreement with the experimental observations and indicates the presence of the nonlocal response associated with cylindrical surface plasmons of nanowires.

Keywords:

Metamaterials; plasmonics; nanowires; SNOM; nonlocality; epsilon-near-zero