title: Visible near-infrared light scattering of single silver split-ring structure made by nanosphere lithography.
abstract: We succeeded in making a silver split-ring (SR) structure of approximately 130 nm in diameter on a glass substrate using a nanosphere lithography technique. The light scattering spectrum in visible near-infrared region of a single, isolated SR was measured using a microscope spectroscopy optical system. The electromagnetic field enhancement spectrum and distribution of the SR structure were simulated by the finite-difference time-domain method, and the excitation modes were clarified. The long wavelength peak in the light scattering spectra corresponded to a fundamental LC resonance mode excited by an incident electric field. It was shown that a single SR structure fabricated as abovementioned can operate as a resonator and generate a magnetic dipole.
authors.affiliation: Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima, Tokushima 770-8506, Japan. okamoto@opt.tokushima-u.ac.jp
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Okamoto
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Fukuta
authors.forename: Shuji
authors.initials: S
authors.lastname: Sato
authors.forename: Masanobu
authors.initials: M
authors.lastname: Haraguchi
authors.forename: Masuo
authors.initials: M
authors.lastname: Fukui
mesh_terms: D004574:Electromagnetic Fields; D055590:Electromagnetic Phenomena; D004867:Equipment Design; D008027:Light; D008422:Materials Testing; D054118:Nanospheres / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D055095:Optics and Photonics; D012542:Scattering, Radiation; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods
chemical_list: D012834:Silver