
1.ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
2.Advanced Optics and Photonics Laboratory, Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
3.School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia
Dragomir Neshev (dragomir.neshev@anu.edu.au)
Mohsen Rahmani (mohsen.rahmani@ntu.ac.uk)
Published:31 March 2023,
Published Online:22 February 2023,
Received:6 September 2022,
Revised:10 January 2023,
Accepted:13 January 2023
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Kamali, K. Z. et al. Electrically programmable solid-state metasurfaces via flash localised heating. Light: Science & Applications, 12, 391-397 (2023).
Kamali, K. Z. et al. Electrically programmable solid-state metasurfaces via flash localised heating. Light: Science & Applications, 12, 391-397 (2023). DOI: 10.1038/s41377-023-01078-6.
In the last decades
metasurfaces have attracted much attention because of their extraordinary light-scattering properties. However
their inherently static geometry is an obstacle to many applications where dynamic tunability in their optical behaviour is required. Currently
there is a quest to enable dynamic tuning of metasurface properties
particularly with fast tuning rate
large modulation by small electrical signals
solid state and programmable across multiple pixels. Here
we demonstrate electrically tunable metasurfaces driven by thermo-optic effect and flash-heating in silicon. We show a 9-fold change in transmission by < 5 V biasing voltage and the modulation rise-time of < 625 µs. Our device consists of a silicon hole array metasurface encapsulated by transparent conducting oxide as a localised heater. It allows for video frame rate optical switching over multiple pixels that can be electrically programmed. Some of the advantages of the proposed tuning method compared with other methods are the possibility to apply it for modulation in the visible and near-infrared region
large modulation depth
working at transmission regime
exhibiting low optical loss
low input voltage requirement
and operating with higher than video-rate switching speed. The device is furthermore compatible with modern electronic display technologies and could be ideal for personal electronic devices such as flat displays
virtual reality holography and light detection and ranging
where fast
solid-state and transparent optical switches are required.
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