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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 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.
1094-4087
30107-30116
He, Fei
0b5b12e2-82ec-407b-8e4f-a8ba024d9fb3
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Fang, Xu
96b4b212-496b-4d68-82a4-06df70f94a86
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), 30107-30116. (doi:10.1364/OE.402404).

Record type: Article

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.

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Continuous beam steering by coherent light-by-light control of dielectric metasurface phase gradient_XF - Accepted Manuscript
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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
ORCID for Kevin F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976
ORCID for Xu Fang: ORCID iD orcid.org/0000-0003-1735-2654

Catalogue record

Date deposited: 15 Sep 2020 16:34
Last modified: 26 Sep 2020 01:40

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Contributors

Author: Fei He
Author: Xu Fang ORCID iD

University divisions

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