Quantized plasmon modes for metallic nanoparticles of arbitrary shape with a generic dielectric function

TL;DR

This paper introduces a method to quantize plasmonic modes in metallic nanoparticles of any shape, incorporating realistic dielectric functions, enabling accurate modeling of complex light-matter interactions.

Contribution

It presents a novel approach to quantize electromagnetic responses of arbitrarily shaped metallic nanoparticles with realistic dielectric functions.

Findings

Successfully reproduces classical linear response in quantum modes

Enables modeling of strong plasmon-molecule coupling

Applicable to arbitrary nanoparticle geometries

Abstract

In this work we introduce an effective approach to quantize the electromagnetic response of plasmonic metallic nanostructures. Their shape is arbitrary and they feature a realistic description of the frequency-dependent metal dielectric function that is based on experimental data. The derived quantum modes correctly reproduce the linear response macroscopic polarization of the nanoparticle upon external drive according to classical macroscopic Maxwell equations in the quasistatic limit. Such methodology paves the way for accurate modeling of plexcitonic system, where strong plasmon-molecule coupling and/or strong-driving fields call for a quantized description of the plasmonic response.