title: Fabrication of polarization-dependent reflective metamaterial by focused ion beam milling.
abstract: By focused ion beam milling, we fabricated near-IR reflective metamaterials consisting of nano-aperture arrays. Optimum parameters of ion beam current and accelerating voltage in the fabrication process are obtained. Nano-apertures constituting reflective metamaterial are successfully milled, and possess a reflective resonance in the near-IR spectral range. With a double-split-ring resonator structure for the nano-aperture, the intensity reflection at resonance is rendered polarization dependent. It is found that the point group symmetry of the nano-aperture array determines the amount of anisotropy in the intensity reflection. Finite-difference time-domain simulation was adopted to identify details of nano-aperture metastructures transferred from nano-aperture patterns by the focused ion beam milling.
authors.affiliation: Department of Physics, Ewha Womans University, CNRS-Ewha International Research Center, Seoul 120-750, Korea.
authors.forename: J
authors.initials: J
authors.lastname: Kim
authors.forename: Y U
authors.initials: YU
authors.lastname: Lee
authors.forename: Boyoung
authors.initials: B
authors.lastname: Kang
authors.forename: J H
authors.initials: JH
authors.lastname: Woo
authors.forename: E Y
authors.initials: EY
authors.lastname: Choi
authors.forename: E S
authors.initials: ES
authors.lastname: Kim
authors.forename: M
authors.initials: M
authors.lastname: Gwon
authors.forename: D-W
authors.initials: DW
authors.lastname: Kim
authors.forename: J W
authors.initials: JW
authors.lastname: Wu