title: Monopole resonators in planar plasmonic metamaterials.
abstract: We first present a new phenomenon: the quarter-wavelength resonance of an electromagnetic field in planar plasmonic metamaterials consisting of asymmetrically coupled air-slot arrays, which is essential for a monopole resonator. The anti-nodal electric field intensity of the quarter-wavelength fundamental mode is formed by strong charge concentrations at the sharp metallic edges of the crossing position of the air-slots, and the nodal point of the electric field intensity naturally occurs at the other end of the air-slot. By tuning the structural asymmetry, the quarter-wavelength resonances were successfully split from the half-wavelength resonance, experimentally and numerically.
authors.forename: Joong Wook
authors.initials: JW
authors.lastname: Lee
authors.forename: Jin-Kyu
authors.initials: JK
authors.lastname: Yang
authors.forename: Ik-Bu
authors.initials: IB
authors.lastname: Sohn
authors.forename: Hyung Keun
authors.initials: HK
authors.lastname: Yoo
authors.forename: Chul
authors.initials: C
authors.lastname: Kang
authors.forename: Chul-Sik
authors.initials: CS
authors.lastname: Kee