Slowing down surface plasmons on a Moiré surface
Date
2009-02
Journal Title
Journal ISSN
Volume Title
Publisher
The American Physical Society
Abstract
We have demonstrated slow propagation of surface plasmons on metallic Moiré surfaces. The phase shift at the node of the Moiré surface localizes the propagating surface plasmons and adjacent nodes form weakly coupled plasmonic cavities. Group velocities around vg=0.44c at the center of the coupled cavity band and almost a zero group velocity at the band edges are observed. A tight binding model is used to understand the coupling behavior. Furthermore, the sinusoidally modified amplitude about the node suppresses the radiation losses and reveals a relatively high quality factor (Q=103).
Description
Keywords
Light velocity, Adjacent nodes, Band edges, Coupled cavities, Group velocities, High-quality factors, Radiation loss, Slow propagation, Surface plasmons, Tight-binding models, Zero-group velocities, Plasmons