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Chalcogenide-based phase-change metamaterials for all-optical, high-contrast switching in a fraction of a wavelength

Chalcogenide-based phase-change metamaterials for all-optical, high-contrast switching in a fraction of a wavelength
Chalcogenide-based phase-change metamaterials for all-optical, high-contrast switching in a fraction of a wavelength
To realise the significant performance gains to be made from all-optical data processing, compact, rapid and high modulation contrast devices need to be produced that can rapidly change their refractive index and absorption1. Phase-change metamaterials are an amalgamation of two existing material concepts to provide new optical functionalities in a single planar device less than 100 nm thick (see figure). The phase-change layer is typically a chalcogenide glass (Ge2Sb2Te5) that can be optically switched between two phases: crystalline and amorphous. The layer will remain in either of these states until it is switched again, providing a reversible 'memory' effect. The metamaterial layer consists of repeating unit cells of asymmetric split ring resonators milled from a thin layer of plasmonic material, such as gold. Such a layer will produce sharp resonance peaks in transmission and reflection in the near-IR, the spectral positions of which are sensitive to the local dielectric environment.
Maddock, J.
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Mills, B.
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Hewak, D.
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MacDonald, K.F.
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Maddock, J.
7a64744f-cd7c-4c6a-b584-af266dd08da5
Mills, B.
05f1886e-96ef-420f-b856-4115f4ab36d0
Hewak, D.
87c80070-c101-4f7a-914f-4cc3131e3db0
MacDonald, K.F.
76c84116-aad1-4973-b917-7ca63935dba5

Maddock, J., Mills, B., Hewak, D. and MacDonald, K.F. (2013) Chalcogenide-based phase-change metamaterials for all-optical, high-contrast switching in a fraction of a wavelength. International conference on photorefractive effects, materials and devices (PR'13), United Kingdom. 04 - 06 Sep 2013.

Record type: Conference or Workshop Item (Paper)

Abstract

To realise the significant performance gains to be made from all-optical data processing, compact, rapid and high modulation contrast devices need to be produced that can rapidly change their refractive index and absorption1. Phase-change metamaterials are an amalgamation of two existing material concepts to provide new optical functionalities in a single planar device less than 100 nm thick (see figure). The phase-change layer is typically a chalcogenide glass (Ge2Sb2Te5) that can be optically switched between two phases: crystalline and amorphous. The layer will remain in either of these states until it is switched again, providing a reversible 'memory' effect. The metamaterial layer consists of repeating unit cells of asymmetric split ring resonators milled from a thin layer of plasmonic material, such as gold. Such a layer will produce sharp resonance peaks in transmission and reflection in the near-IR, the spectral positions of which are sensitive to the local dielectric environment.

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e-pub ahead of print date: 2013
Venue - Dates: International conference on photorefractive effects, materials and devices (PR'13), United Kingdom, 2013-09-04 - 2013-09-06
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 365179
URI: http://eprints.soton.ac.uk/id/eprint/365179
PURE UUID: 2a202c07-476b-4097-b471-912118d5b010
ORCID for B. Mills: ORCID iD orcid.org/0000-0002-1784-1012
ORCID for D. Hewak: ORCID iD orcid.org/0000-0002-2093-5773
ORCID for K.F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976

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Date deposited: 27 May 2014 13:02
Last modified: 18 Feb 2021 17:08

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Contributors

Author: J. Maddock
Author: B. Mills ORCID iD
Author: D. Hewak ORCID iD
Author: K.F. MacDonald ORCID iD

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