Generation of achromatic auto-focusing Airy beam for visible light by an all-dielectric metasurface

The focusing performance of optical beams has always played an important role in various applications such as imaging, displaying, and sensing. In contrast to a traditional focused beam with gradually increasing light intensity, an auto-focusing Airy beam exhibits an abrupt way of focusing light ene...

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Bibliographic Details
Published in:Journal of applied physics 2022-01, Vol.131 (4)
Main Authors: Zhang, Song, Huo, Pengcheng, Wang, Yilin, Li, Moxin, Zhang, Cheng, Xu, Ting
Format: Article
Language:English
Subjects:
Applied physics
Focusing
Ion beams
Light
Light sheets
Luminous intensity
Medical imaging
Metasurfaces
Optical components
Titanium dioxide
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Summary:The focusing performance of optical beams has always played an important role in various applications such as imaging, displaying, and sensing. In contrast to a traditional focused beam with gradually increasing light intensity, an auto-focusing Airy beam exhibits an abrupt way of focusing light energy. However, owning to the chromatic dispersion of light, the previously demonstrated auto-focusing Airy beam always suffers from chromatic aberration. Here, we show that with judicious dispersion engineering of its constituent nanostructures, a metasurface can generate auto-focusing Airy beam without chromatism for the visible light. In experimental demonstration, we implement a dielectric metasurface composed of TiO2 nanopillars that generates an achromatic auto-focusing Airy beam with diffraction-limited performance covering the wavelength range from 450 to 600 nm. This study paves the way toward efficient achromatic auto-focusing Airy beam generation based on flat optical components, enabling diverse potential applications including biomedical imaging, light-sheet microscopy, and particle manipulation.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0077930