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Macdonald, Kevin
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2020Exotic effects in nanomechanical metamaterials
- 2018Optical bistability in shape-memory nanowire metamaterial arraycitations
- 2017Optical plasmonic response of niobium around the superconducting transition temperature
- 2017Merging metamaterial and optical fiber technologies
- 2017Fibre-coupled photonic metadevices
- 2014Femtosecond multi-level phase switching in chalcogenide thin films for all-optical data and image processing
- 2013Chalcogenide-based phase-change metamaterials for all-optical, high-contrast switching in a fraction of a wavelength
- 2010Switching metamaterials with electronic signals and electron-beam excitations
- 2010Metamaterial electro-optic switch of nanoscale thicknesscitations
- 2010Chalcogenide plasmonic metamaterial switches
- 2010Active chalcogenide glass photonics and electro-optics for the mid-infrared
- 2009Chalcogenide glass metamaterial optical switch
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article
Optical bistability in shape-memory nanowire metamaterial array
Abstract
Non-volatile temperature-induced structural phase transitions such as those found in chalcogenide glasses are known to lead to strong changes in optical properties and are widely used in rewritable optical disk technology. Herein, we demonstrate that thermally activated optical memory can be achieved via the nanostructural reconfiguration of a metallic nanowire metamaterial array made from a shape-memory alloy: A nickel-titanium film of nanoscale thickness structured on the subwavelength scale exhibits bistability of its optical properties upon temperature cycling between 30 °C and 210 °C. The structure, comprising an array of NiTi nanowires coated with a thin film of gold to enhance its plasmonic properties, can exist in two non-volatile states presenting an optical reflectivity differential of 12% via nanoscale mutual displacements of alternating nanowires in the structure. Such all-metal shape-memory photonic gratings and metamaterials may find applications in bistable optical devices.