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

Marco Romanelli, Gabriel Gil, Stefano Corni

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.

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

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.

Paper Structure

This paper contains 18 equations, 2 figures.

Figures (2)

  • Figure 1: Ellipsoidal NP model used for simulations featuring 1371 surface tesserae.
  • Figure 2: Imaginary part of the xx component of the dipole-dipole polarizability tensor for the ellipsoidal NP (Fig. \ref{['fig:NP']}) when the $f(\omega)$ function is fitted to Ag Brendel-Bormannrakic1998 (a) or Au Etchegoinetchegoin2006 (b) reference data. The classical PCM-NP (solid blue) and quantum Q-PCM-NP (dashed orange) results are shown.