Acoustic geometric-phase meta-array

Metasurfaces based on geometric phase acquired from the conversion of the optical spin states provide a robust control over the wavefront of light, and have been widely employed for construction of various types of functional metasurface devices. However, this powerful approach cannot be readily tra...

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Bibliographic Details
Published in:New journal of physics 2021-11, Vol.23 (11), p.113026
Main Authors: Liu, Bingyi, Su, Zhaoxian, Zeng, Yong, Wang, Yongtian, Huang, Lingling, Zhang, Shuang
Format: Article
Language:English
Subjects:
acoustic
Acoustic waves
Acoustics
Angular momentum
Arrays
Conversion
geometric phase
metalens
Physics
Robust control
topological charge
vortex beam
Wave fronts
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Summary:Metasurfaces based on geometric phase acquired from the conversion of the optical spin states provide a robust control over the wavefront of light, and have been widely employed for construction of various types of functional metasurface devices. However, this powerful approach cannot be readily transferred to the manipulation of acoustic waves because acoustic waves do not possess the spin degree of freedom. Here, we propose the concept of acoustic geometric-phase meta-array by leveraging the conversion of orbital angular momentum of acoustic waves, where well-defined geometric-phases can be attained through versatile topological charge conversion processes. This work extends the concept of geometric-phase metasurface from optics to acoustics, and provides a new route for acoustic wave control.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ac33f2