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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

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Multiple Fano resonances in spoof localized surface plasmons.

Zhen Liao, Bai Cao Pan, Xiaopeng Shen

|July 1, 2014

Summary

Researchers observed bright and dark modes in spoof localized surface plasmons (LSPs) within metallic disks. Coupling between disks created Fano resonances, useful for plasmonic devices at lower frequencies.

Area of Science:

Plasmonics and Nanophotonics
Metamaterials and Metasurfaces
Microwave Engineering

Background:

Spoof localized surface plasmons (LSPs) are engineered electromagnetic modes in subwavelength metallic structures.
Understanding mode coupling and resonance phenomena is crucial for designing advanced plasmonic devices.

Purpose of the Study:

To investigate the emergence of bright and dark modes in spoof LSPs.
To explore the coupling of these modes in asymmetric bi-disk structures.
To analyze the resulting Fano resonances and their polarization dependence.

Main Methods:

Theoretical modeling of spoof LSPs in ultrathin corrugated metallic disks.
Numerical simulations of coupled asymmetric bi-disk structures.
Fabrication and microwave frequency measurements of the designed bi-disk structure.

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Main Results:

Observed distinct bright (dipolar) and dark (multipolar) modes in spoof LSPs.
Demonstrated mode coupling between adjacent asymmetric disks, leading to dark mode emergence.
Identified multiple Fano resonances arising from destructive interference between dark and broadened bright modes.
Confirmed strong polarization dependence of the observed Fano line-shapes.

Conclusions:

Coupling between bright and dark modes in spoof LSPs can be controlled by disk geometry and proximity.
Multiple Fano resonances with significant polarization dependence were achieved.
The findings suggest potential applications for these structures in low-frequency plasmonic devices.