Title :
Dispersion Relation of Bloch Modes in Corrugated Metallic Thin Film With Square-Lattice Nanowell Array
Author :
Zhenzhen Wang ; Chunxia Wang ; Qiang Kan ; Hongda Chen
Author_Institution :
State Key Lab. Integrated Optoelectron., Inst. of Semicond., Beijing, China
Abstract :
The optical properties of plasmonic crystal consisting of corrugated metallic thin film with square-lattice nanowell array are theoretically investigated. The dispersion relationship and mode behaviors of surface plasmon polariton (SPP) Bloch modes around the Γ point in the first Brillouin zone are calculated using rigorous coupled wave analysis method. We found that these properties are relevant to the Bloch-mode excitation of the top surface of metal layer by free-space illumination. We have also studied the influence of the patterned silicon substrate on the excitation of SPP Bloch mode and found that with the increase of gold film thickness, the proportion of energy coupling to the silicon substrate becomes smaller, which would increase the coupling efficiency of SPP mode.
Keywords :
Brillouin zones; gold; metallic thin films; nanostructured materials; optical arrays; optical dispersion; plasmonics; polaritons; surface plasmons; Γ point; Au; Bloch mode excitation; SPP Bloch mode; Si; corrugated metallic thin film; coupling efficiency; dispersion relation; energy coupling; first Brillouin zone; free-space illumination; gold film thickness; metal layer; mode behaviors; optical properties; patterned silicon substrate; plasmonic crystal; rigorous coupled wave analysis method; square-lattice nanowell array; surface plasmon polariton Bloch modes; Crystals; Dispersion; Gold; Plasmons; Silicon; Vectors; Dispersion relation; SPP Bloch mode; plasmonic crystal; square lattice;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2013.2262114
