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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Nonlocal study of ultimate plasmon hybridization.

Søren Raza, Martijn Wubs, Sergey I Bozhevolnyi

|February 28, 2015

Summary

We explored plasmonic dimers using a generalized nonlocal optical response (GNOR) model. Nonlocality limits plasmon hybridization in touching dimers, with a new analytical equation for resonance energies.

Area of Science:

Plasmonics
Nanophotonics
Condensed Matter Physics

Background:

Optical properties of metallic nanoparticles are crucial for nanophotonics.
Plasmonic dimers exhibit unique optical responses due to interparticle coupling.
Nonlocal optical effects become significant at the nanoscale.

Purpose of the Study:

To investigate the impact of nonlocality on plasmon hybridization in metallic dimers.
To analyze the transition from separated to overlapping plasmonic dimers.
To derive an analytical model for resonance energies in touching dimers.

Main Methods:

Generalized nonlocal optical response (GNOR) model incorporating convective and diffusive electron currents.
Analysis of plasmonic dimers across different configurations (separated, touching, overlapping).

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Application of transformation optics to derive analytical expressions.

Main Results:

A fundamental limit on the hybridization of bonding plasmon modes in touching dimers due to nonlocality was identified.
The study provides a detailed analysis of the transition in optical response as dimer separation changes.
A simple analytical equation for resonance energies was successfully derived.

Conclusions:

Nonlocality plays a critical role in dictating plasmon hybridization, especially in touching dimers.
The GNOR model offers a more accurate description of nanoscale plasmonic phenomena.
The derived analytical equation simplifies the prediction of resonance energies for touching plasmonic dimers.