Dispersion of surface plasmon polaritons on silver film with rectangular hole arrays in a square lattice
Journal
Applied Physics Letters
Journal Volume
89
Journal Issue
9
Date Issued
2006
Author(s)
Abstract
Extraordinary optical transmission through a two-dimensional Ag film in the far infrared region was demonstrated. The holes were rectangular and arranged in a square lattice. When either the width or the length size of the rectangular holes was close to the half of the lattice constant a/2, the degenerate (±1,0) Ag/Si or (0,±1) Ag/Si modes split into two peaks. Additionally, the surface plasmon dispersion relations of the square hole array with different aspect ratios of holes were measured. As the aspect ratio increased, the surface plasmon tended to couple strongly with the local charge dipole oscillations in a direction perpendicular to the long edges. The charge dipole oscillation parallel to the long edges gradually disappeared. This is confirmed by experiments using the polarized light. The dynamic properties of the surface plasmon dispersion relations show the interaction among localized surface plasmons and its mechanism. © 2005 American Institute of Physics.
Other Subjects
Aspect ratio; Crystal lattices; Infrared radiation; Oscillations; Silver; Surface plasmon resonance; Hole arrays; Square lattices; Surface plasmon dispersion; Surface plasmon polaritons; Optical films
Type
journal article