Journal
OPTICS EXPRESS
Volume 28, Issue 20, Pages 30107-30116Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.402404
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Funding
- Engineering and Physical Sciences Research Council [EP/M009122/1]
- Royal Society [IEC\R3\183071, IES\R3\183086]
- EPSRC [EP/M009122/1] Funding Source: UKRI
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Continuous and reversible tuning of the properties of optical metasurfaces, as a functionality that would enable a range of device applications, has been a focus of the metasurface research field in recent years. Tuning mechanisms proposed and demonstrated so far have generally relied upon changing the morphology of a metasurface or the intrinsic properties of its constituent materials. Here we introduce, via numerical simulation, an alternative approach to achieve continuous tuning of gradient metasurface response, and illustrate its potential application to the challenge of continuous beam steering, as required for example in LIDAR and machine vision systems. It is based upon the coherent illumination of a silicon nano-pillar metasurface with two counter-propagating beams. Control of the input beams' relative phase and intensity enables tuning of the individual nano-pillars' electromagnetic response and thereby the phase gradient of the array, which in turn steers the direction of the output beam continuously over an angular range of approximately 9 degrees. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
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