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Slowing down surface plasmons on a moiré surface.

Askin Kocabas¹, S Seckin Senlik, Atilla Aydinli

¹Department of Physics, Bilkent University, 06800, Ankara, Turkey.

Physical Review Letters

|March 5, 2009

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We observed slow surface plasmon propagation on metallic Moiré surfaces, creating coupled plasmonic cavities. This structure suppresses losses, leading to a high-quality factor for enhanced plasmonic devices.

Area of Science:

Plasmonics
Condensed Matter Physics
Nanophotonics

Background:

Surface plasmons are collective electron oscillations on metal surfaces.
Metallic Moiré surfaces offer unique electronic and optical properties due to their periodic structure.
Controlling plasmon propagation is crucial for nanophotonic applications.

Purpose of the Study:

To investigate the propagation dynamics of surface plasmons on metallic Moiré surfaces.
To explore the formation of plasmonic cavities and their properties.
To understand the factors influencing plasmon loss and quality factor.

Main Methods:

Experimental demonstration of surface plasmon propagation.
Characterization of plasmonic cavities formed by Moiré nodes.

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Theoretical analysis using a tight-binding model.

Measurement of group velocity and quality factor.

Main Results:

Demonstrated slow surface plasmon propagation (vg ≈ 0.44c) on metallic Moiré surfaces.
Observed localization of surface plasmons at Moiré nodes, forming weakly coupled plasmonic cavities.
Identified near-zero group velocity at the band edges of the coupled cavity system.
Achieved a high quality factor (Q=103) due to suppressed radiation losses.

Conclusions:

Metallic Moiré surfaces enable the creation of efficient plasmonic cavities.
The unique band structure of Moiré surfaces allows for precise control over plasmon propagation and localization.
This work paves the way for novel plasmonic devices with enhanced performance.