Cencillo-Abad, P;
Ou, J-Y;
Plum, E;
Valente, J;
Zheludev, NI;
(2016)
Random access actuation of nanowire grid metamaterial.
Nanotechnology
, 27
(48)
, Article 485206. 10.1088/0957-4484/27/48/485206.
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Abstract
While metamaterials offer engineered static optical properties, future artificial media with dynamic random-access control over shape and position of meta-molecules will provide arbitrary control of light propagation. The simplest example of such a reconfigurable metamaterial is a nanowire grid metasurface with subwavelength wire spacing. Recently we demonstrated computationally that such a metadevice with individually controlled wire positions could be used as dynamic diffraction grating, beam steering module and tunable focusing element. Here we report on the nanomembrane realization of such a nanowire grid metasurface constructed from individually addressable plasmonic chevron nanowires with a 230 nm × 100 nm cross-section, which consist of gold and silicon nitride. The active structure of the metadevice consists of 15 nanowires each 18 μm long and is fabricated by a combination of electron beam lithography and ion beam milling. It is packaged as a microchip device where the nanowires can be individually actuated by control currents via differential thermal expansion.
| Type: | Article |
|---|---|
| Title: | Random access actuation of nanowire grid metamaterial |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0957-4484/27/48/485206 |
| Publisher version: | https://doi.org/10.1088/0957-4484/27/48/485206 |
| Language: | English |
| Additional information: | Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (http://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| Keywords: | reconfigurable metamaterial, nanowire, metadevice, nanoelectromechanical system |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10033888 |
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