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Auxetic nanomechanical metamaterials

Auxetic nanomechanical metamaterials
Auxetic nanomechanical metamaterials
Metamaterials derive unique optical properties from artificial structuring of plasmonic materials, while auxetics consist of artificial reconfigurable structures causing them to exhibit unique mechanical properties. In particular, auxetics possess a negative Poisson’s ratio - that is a unique mechanical property causing them to expand laterally upon being stretched. Here we merge the fields of plasmonic metamaterials and auxetics by creating novel nanomaterials that simultaneously exhibit optical properties of metamaterials and mechanical properties of auxetics.

We demonstrate isotropic and anisotropic nanoauxetic metamaterials of about 100 nm thickness. The structures, which have micro- and nanoscale periodicity, have been fabricated by focused ion beam milling from an elastic dielectric membrane supporting a thin film of plasmonic metal. The nanomechanical metamaterials are based on isotropic auxetic stars as well as anisotropic re-entrant honeycomb designs. They exhibit optical resonances in the visible and near infrared parts of the spectrum that are characteristic for plasmonic metamaterials. Actuation using a 100 nm micromanipulator tip confirms lateral expansion upon axial stretching and lateral shrinking upon axial compression with Poisson’s ratios down to -0.6 for the latter.

Nanoauxetic metamaterials are a novel class of mechanical nanomaterials promising a range of novel optomechanical properties such as tuneable reconfigurable metamaterials and two-dimensional gratings that retain isotropic optical properties (or fixed anisotropy) upon deformation. Careful design and structuring will enable materials with both tuneable optical and mechanical properties that can be chosen at will. The auxetic micro- and nanostructures exhibiting both plasmonic optical resonances and a negative Poisson’s ratio - that we demonstrate here - are first examples of this.
Valente, J.
b1d50ead-5c3d-4416-ad05-3beb1b373146
Plum, E.
50761a26-2982-40df-9153-7aecc4226eb5
Zheludev, N.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Valente, J.
b1d50ead-5c3d-4416-ad05-3beb1b373146
Plum, E.
50761a26-2982-40df-9153-7aecc4226eb5
Zheludev, N.
32fb6af7-97e4-4d11-bca6-805745e40cc6

Valente, J., Plum, E. and Zheludev, N. (2015) Auxetic nanomechanical metamaterials. Materials Research Society MRS 2015 Fall Meeting & Exhibit, United States. 29 Nov - 04 Dec 2015. (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

Metamaterials derive unique optical properties from artificial structuring of plasmonic materials, while auxetics consist of artificial reconfigurable structures causing them to exhibit unique mechanical properties. In particular, auxetics possess a negative Poisson’s ratio - that is a unique mechanical property causing them to expand laterally upon being stretched. Here we merge the fields of plasmonic metamaterials and auxetics by creating novel nanomaterials that simultaneously exhibit optical properties of metamaterials and mechanical properties of auxetics.

We demonstrate isotropic and anisotropic nanoauxetic metamaterials of about 100 nm thickness. The structures, which have micro- and nanoscale periodicity, have been fabricated by focused ion beam milling from an elastic dielectric membrane supporting a thin film of plasmonic metal. The nanomechanical metamaterials are based on isotropic auxetic stars as well as anisotropic re-entrant honeycomb designs. They exhibit optical resonances in the visible and near infrared parts of the spectrum that are characteristic for plasmonic metamaterials. Actuation using a 100 nm micromanipulator tip confirms lateral expansion upon axial stretching and lateral shrinking upon axial compression with Poisson’s ratios down to -0.6 for the latter.

Nanoauxetic metamaterials are a novel class of mechanical nanomaterials promising a range of novel optomechanical properties such as tuneable reconfigurable metamaterials and two-dimensional gratings that retain isotropic optical properties (or fixed anisotropy) upon deformation. Careful design and structuring will enable materials with both tuneable optical and mechanical properties that can be chosen at will. The auxetic micro- and nanostructures exhibiting both plasmonic optical resonances and a negative Poisson’s ratio - that we demonstrate here - are first examples of this.

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More information

Accepted/In Press date: 31 August 2015
Venue - Dates: Materials Research Society MRS 2015 Fall Meeting & Exhibit, United States, 2015-11-29 - 2015-12-04
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 381127
URI: https://eprints.soton.ac.uk/id/eprint/381127
PURE UUID: d598bc33-bd5b-4adb-b255-f663348651e8
ORCID for E. Plum: ORCID iD orcid.org/0000-0002-1552-1840
ORCID for N. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 23 Sep 2015 16:50
Last modified: 20 Nov 2018 01:36

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