Slowing down surface plasmons on a Moiré surface

Date
2009-02
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Source Title
Physical Review Letters
Print ISSN
0031-9007
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Publisher
The American Physical Society
Volume
102
Issue
6
Pages
1 - 4
Language
English
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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).

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