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Effective medium theory for anisotropic media with plasmonic core-shell nanoparticle inclusions

Effective medium theory for anisotropic media with plasmonic core-shell nanoparticle inclusions
Effective medium theory for anisotropic media with plasmonic core-shell nanoparticle inclusions
Core-shell building blocks have been found useful in recent years as inclusions, in the search for metamaterials with tailored properties. Either the core or the shell of these composite inclusions may be metallic, and the dielectric component may be both radially anisotropic and radially inhomogeneous. In tunable anisotropic metamaterials, the tuning may then be achieved through the host, the core, or some combination thereof. However a theoretical picture is harder to build. Here we propose an approach to an effective medium theory for such materials, valid in the quasi-static limit. The method proceeds first by homogenising the interior of complex particle, and then uses standard anisotropic effective medium methods to provide bulk effective homogenized parameters. By varying the degree of inhomogeneity in the core, shell and dielectric-metal material volume fractions, the technique can be used as a tool for the design of metamaterials with specifically engineered properties. We find that metamaterial properties can be readily tuned by reorienting the optical axis of the host (e.g. liquid crystal). In particular, there is a possibility of switching between hyperbolic and conventional anisotropic metamaterial properties by
changing inclusion shell properties.
2190-5444
Reshetnyak, V. Yu.
23805478-88f2-437d-919e-cc3ae203cfb3
Pinkevych, I.P.
e0d9fc48-dc36-498e-8a13-02025e4f32f7
Sluckin, T.J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Urbas, A.M.
79f3762e-9724-4d28-b3a1-973317b7b8b7
Evans, D.R.
cbbb4433-abd3-4caf-b442-f20f428f9047
Reshetnyak, V. Yu.
23805478-88f2-437d-919e-cc3ae203cfb3
Pinkevych, I.P.
e0d9fc48-dc36-498e-8a13-02025e4f32f7
Sluckin, T.J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Urbas, A.M.
79f3762e-9724-4d28-b3a1-973317b7b8b7
Evans, D.R.
cbbb4433-abd3-4caf-b442-f20f428f9047

Reshetnyak, V. Yu., Pinkevych, I.P., Sluckin, T.J., Urbas, A.M. and Evans, D.R. (2018) Effective medium theory for anisotropic media with plasmonic core-shell nanoparticle inclusions. The European Physical Journal Plus, 133 (373). (doi:10.1140/epjp/i2018-12226-4).

Record type: Article

Abstract

Core-shell building blocks have been found useful in recent years as inclusions, in the search for metamaterials with tailored properties. Either the core or the shell of these composite inclusions may be metallic, and the dielectric component may be both radially anisotropic and radially inhomogeneous. In tunable anisotropic metamaterials, the tuning may then be achieved through the host, the core, or some combination thereof. However a theoretical picture is harder to build. Here we propose an approach to an effective medium theory for such materials, valid in the quasi-static limit. The method proceeds first by homogenising the interior of complex particle, and then uses standard anisotropic effective medium methods to provide bulk effective homogenized parameters. By varying the degree of inhomogeneity in the core, shell and dielectric-metal material volume fractions, the technique can be used as a tool for the design of metamaterials with specifically engineered properties. We find that metamaterial properties can be readily tuned by reorienting the optical axis of the host (e.g. liquid crystal). In particular, there is a possibility of switching between hyperbolic and conventional anisotropic metamaterial properties by
changing inclusion shell properties.

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Reshetnyak_etal_epjplus2018 - Accepted Manuscript
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More information

Accepted/In Press date: 25 August 2018
e-pub ahead of print date: 19 September 2018
Published date: September 2018

Identifiers

Local EPrints ID: 423429
URI: http://eprints.soton.ac.uk/id/eprint/423429
ISSN: 2190-5444
PURE UUID: d1229b36-db3f-4066-af08-e4a7cd160434
ORCID for T.J. Sluckin: ORCID iD orcid.org/0000-0002-9163-0061

Catalogue record

Date deposited: 21 Sep 2018 16:30
Last modified: 17 Dec 2019 05:14

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