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Surface plasmon dispersion engineering for optimizing scattering, emission, and radiation properties on a graphene
Applied Optics
|May 14, 2020
Summary
We developed a method to enhance light scattering from double graphene spheres. This technique achieves superscattering by overlapping two types of localized surface plasmons (LSPs), boosting electromagnetic cross-section and emitter efficiencies.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Graphene's unique optical properties enable novel plasmonic applications.
- Localized surface plasmons (LSPs) enhance light-matter interactions.
- Controlling LSP resonances is key to advanced optical devices.
Purpose of the Study:
- To present a dispersion engineering method for analyzing double graphene layer spherical structures.
- To investigate conditions for achieving superscattering through overlapping LSP resonances.
- To explore the impact of overlapping LSPs on spontaneous emission and radiation efficiency.
Main Methods:
- Rigorous electromagnetic theory for dispersion engineering.
- Analysis of scattering properties of double graphene layer spheres.
- Investigation of localized surface plasmon (LSP) resonance conditions.
Main Results:
- Identified conditions for two distinct multipolar LSP resonances to occur at the same frequency.
- Demonstrated superscattering with extraordinary enhancement of scattering cross-section.
- Showed significant enhancement in spontaneous emission and radiation efficiencies for nearby emitters.
Conclusions:
- The proposed dispersion engineering method effectively controls LSP resonances in double graphene spheres.
- Overlapping LSP resonances lead to superscattering and enhanced light-matter interactions.
- This approach offers potential for advanced optical and photonic applications.
