Loughborough University
Browse

Electromagnetic response of nanoparticles with a metallic core and a semiconductor shell

Download (1.14 MB)
journal contribution
posted on 2021-03-22, 13:57 authored by Fahime Seyedheydari, Kevin M Conley, Vaibhav Thakore, Mikko Karttunen, Ari Sihvola, Tapio Ala-NissilaTapio Ala-Nissila
We study the interplay between localized surface plasmon resonances from metallic cores and electromagnetic resonances from semiconducting shells in core@shell nanoparticles in the optical and near-infrared regions. To this end, we consider silver (Ag) spheres as plasmonically active nanoparticles with radii 20 nm, covered with shells of silicon (Si) up to 160 nm in thickness. We use the classical Lorenz-Mie theory to calculate the response of the core@shell nanoparticles to an external electromagnetic field that reveals a high degree of tunability of the Ag surface plasmons with a varying Si shell thickness, and a consequent merging of their Mie resonances. In contrast with pure metallic systems, the use of a low-bandgap semiconducting shell allows for a unique interrelation between its strong characteristic magnetic dipole mode and the localized surface plasmon resonance of the metallic core. This allows control over the forward and backward scattering efficiencies in the near-infrared in accordance with the predictions based on the Kerker conditions. Employing several other core@shell materials (Al@Si, Au@Si and Ag@Ge), we show that this approach to tailoring the absorption and scattering efficiencies, based on Kerker’s conditions, can be further generalized to other similar core@shell systems.

Funding

Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canada Research Chairs Program

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Journal of Physics Communications

Volume

5

Issue

1

Publisher

IOP Publishing

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by IOP under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2020-12-17

Publication date

2021-01-08

Copyright date

2021

ISSN

2399-6528

eISSN

2399-6528

Language

  • en

Depositor

Prof Tapio Ala-Nissila. Deposit date: 18 March 2021

Article number

015002

Usage metrics

    Loughborough Publications

    Categories

    No categories selected

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC