Generalized circuit model for coupled plasmonic systems

TL;DR

This paper introduces an analytic circuit model for coupled plasmonic systems that accurately predicts optical resonances and explains spectral shifts, aligning well with experimental and simulation data.

Contribution

It presents a novel circuit-based approach to model coupled plasmonic dimers, including partially conducting links, with quantitative agreement to experiments and simulations.

Findings

Kinetic inductance of linkers causes spectral blue-shifts.

Model accurately predicts resonance wavelengths.

Provides a unified framework for different coupling regimes.

Abstract

We develop an analytic circuit model for coupled plasmonic dimers separated by small gaps that provides a complete account of the optical resonance wavelength. Using a suitable equivalent circuit, it shows how partially conducting links can be treated and provides quantitative agreement with both experiment and full electromagnetic simulations. The model highlights how in the conducting regime, the kinetic inductance of the linkers set the spectral blue-shifts of the coupled plasmon.