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Plasmonic nano-shells: atomistic discrete interaction versus classic electrodynamics models.

Vadim I Zakomirnyi1, Ilia L Rasskazov2, Lasse K Sørensen3

  • 1Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, Stockholm, SE-10691, Sweden. lasse.kragh.soerensen@gmail.com and Siberian Federal University, Krasnoyarsk, 660041, Russia and Institute of Computational Modeling, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia.

Physical Chemistry Chemical Physics : PCCP
|June 11, 2020
PubMed
Summary
This summary is machine-generated.

We investigated metallic nano-shells using advanced models. The study reveals tunable optical polarizability and predicts plasma frequency, offering insights into plasmon resonances for nanoscale materials.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical properties of nanoparticles

Background:

  • Metallic nano-shells exhibit unique optical properties governed by plasmon resonances.
  • Understanding the tunability of these resonances is crucial for nanoscale optical applications.
  • Previous models have limitations in describing small nano-shell behavior.

Purpose of the Study:

  • To investigate the tunability of optical polarizability in small metallic nano-shells.
  • To analyze the spectral positions of dipolar plasmon resonances.
  • To compare theoretical models with experimental data for nano-shells in the 1-15 nm size range.

Main Methods:

  • Utilized the extended discrete interaction model and Mie theory.
  • Analyzed the impact of particle radius to hole radius ratio on plasmon resonances.
  • Applied electron mean free path correction for permittivity in Mie theory.

Main Results:

  • Spectral positions of plasmon resonances show similar functional dependence as predicted for uniform nano-shells.
  • Dipolar plasmon resonances are present in nano-shells within the 2-13 nm size range.
  • Mie theory with corrections could not reproduce the functional form of dipolar modes for small nano-shells.

Conclusions:

  • The extended discrete interaction model accurately describes plasmon resonances in small metallic nano-shells.
  • The ratio of radii is a key factor in tuning optical polarizability.
  • Further refinement of theoretical models is needed to fully capture the behavior of nano-shells at the nanoscale.