Continuous beam steering by coherent light-by-light control of dielectric metasurface phase gradient
Continuous beam steering by coherent light-by-light control of dielectric metasurface phase gradient
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.
30107-30116
He, Fei
0b5b12e2-82ec-407b-8e4f-a8ba024d9fb3
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Fang, Xu
96b4b212-496b-4d68-82a4-06df70f94a86
28 September 2020
He, Fei
0b5b12e2-82ec-407b-8e4f-a8ba024d9fb3
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Fang, Xu
96b4b212-496b-4d68-82a4-06df70f94a86
He, Fei, MacDonald, Kevin F. and Fang, Xu
(2020)
Continuous beam steering by coherent light-by-light control of dielectric metasurface phase gradient.
Optics Express, 28 (20), .
(doi:10.1364/OE.402404).
Abstract
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.
Text
Continuous beam steering by coherent light-by-light control of dielectric metasurface phase gradient_XF
- Accepted Manuscript
More information
Accepted/In Press date: 5 September 2020
e-pub ahead of print date: 24 September 2020
Published date: 28 September 2020
Identifiers
Local EPrints ID: 443873
URI: http://eprints.soton.ac.uk/id/eprint/443873
ISSN: 1094-4087
PURE UUID: 0d080683-fd3d-4aff-bb6f-9c203bb4e7eb
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Date deposited: 15 Sep 2020 16:34
Last modified: 17 Mar 2024 05:53
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Author:
Fei He
Author:
Kevin F. MacDonald
Author:
Xu Fang
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