Metalenses based on the non-parallel double-slit arrays

Metalenses based on surface plasmon polaritons have played an indispensable role in ultra-thin devices designing. The amplitude, phase and polarization of electromagnetic waves all can be controlled easily by modifying the metasurface structures. Here we propose and investigate a new type of structu...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2017-09, Vol.50 (38), p.384001
Main Authors: Shao, Hongyan, Chen, Chen, Wang, Jicheng, Pan, Liang, Sang, Tian
Format: Article
Language:English
Subjects:
Babinet-inverted
metalens
metasurface
multi-focus
phase shift
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Summary:Metalenses based on surface plasmon polaritons have played an indispensable role in ultra-thin devices designing. The amplitude, phase and polarization of electromagnetic waves all can be controlled easily by modifying the metasurface structures. Here we propose and investigate a new type of structure with Babinet-inverted nano-antennas which can provide a series of unit-cells with phase-shifts covering 2π and ensure almost same transmittance simultaneously. As a result, the wavefront can be manipulated by arraying the units in course. Metalenses with the linear asymmetrical double slit unit-cell arrays are designed and the simulative results exhibit their perfect focusing characteristics, including single-focus lenses and multi-focus lenses. The small focus size and high numerical aperture make them stand out from the traditional counterparts in application of precision sensing devices. We expect our designs will provide new insights in the practical applications for metasurfaces in data storages, optical information processing and optical holography.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aa80d6