Plasmonic interactions between a perforated gold film and a thin gold film

• Published in: Chinese physics B Vol. 19; no. 12; pp. 537 - 543
• Main Author: 周昕 李宏建 谢素霞 付少丽 徐海清 吴金军
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.12.2010
• Subjects: 共振能量; 时域有限差分法; 相互作用; 表面等离子体共振
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/12/127806

Based on the finite difference time domain method, we investigated theoretically the optical properties and the plasmonic interactions between a gold film perforated with periodic sub-wavelength holes and a thin gold film. We showed that the plasmon resonant energies and intensities depend strongly on the thicknesses of the two films and the lattice constant. Based on the distributions of normal electric field component Ez, tangential electric field component Ey and total energy, we showed that the optical transmission is due to the collaboration of the localized waveguide resonance, the surface plasmon resonance and the coupling of the fiat-surface plasmon of the two layers.