title: Looking into meta-atoms of plasmonic nanowire metamaterial.
abstract: 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.
authors.affiliation: Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Kun-Tong
authors.initials: KT
authors.lastname: Tsai
authors.forename: Gregory A
authors.initials: GA
authors.lastname: Wurtz
authors.forename: Jen-You
authors.initials: JY
authors.lastname: Chu
authors.forename: Tian-You
authors.initials: TY
authors.lastname: Cheng
authors.forename: Huai-Hsien
authors.initials: HH
authors.lastname: Wang
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Krasavin
authors.forename: Jr-Hau
authors.initials: JH
authors.lastname: He
authors.forename: Brian M
authors.initials: BM
authors.lastname: Wells
authors.forename: Viktor A
authors.initials: VA
authors.lastname: Podolskiy
authors.forename: Juen-Kai
authors.initials: JK
authors.lastname: Wang
authors.forename: Yuh-Lin
authors.initials: YL
authors.lastname: Wang
authors.forename: Anatoly V
authors.initials: AV
authors.lastname: Zayats
keywords: Metamaterials; SNOM; epsilon-near-zero; nanowires; nonlocality; plasmonics