title: Microscopic origin of surface-plasmon radiation in plasmonic band-gap nanostructures.
abstract: We report spatial domain measurements of the damping of surface-plasmon excitations in metal films with periodic nanohole arrays. The measurements reveal a short coherent propagation length of a few microm inside nanohole arrays, consistent with delays of about 10 fs in ultrafast transmission experiments. This implies that the transmission spectra of the entire plasmonic band-gap structure are homogeneously broadened by radiative damping of surface-plasmon excitations. We show that a Rayleigh-like scattering of surface plasmons by the periodic hole array is the microscopic origin of this damping, allowing the reradiation rate to be controlled.
authors: School of Physics, Seoul National University, Seoul 151-742, Korea.
authors: D S
authors: DS
authors: Kim
authors: S C
authors: SC
authors: Hohng
authors: V
authors: V
authors: Malyarchuk
authors: Y C
authors: YC
authors: Yoon
authors: Y H
authors: YH
authors: Ahn
authors: K J
authors: KJ
authors: Yee
authors: J W
authors: JW
authors: Park
authors: J
authors: J
authors: Kim
authors: Q H
authors: QH
authors: Park
authors: C
authors: C
authors: Lienau