Acoustic focusing and Bessel vortexes have great potential in medical ultrasound, particle trapping, and information processing. Based on the generalized Snell's law (GSL), metasurface focusing and Bessel vortexes were achieved by using in-plane phase profiles to shape wavefronts. Recent developments in acoustic metagratings (AMs) have demonstrated an extension of the GSL capable of switching transmitted and reflected vortexes that are determined by the parity of the number of wave propagation trips. However, these metagratings were designed with a certain one-dimensional phase gradient along the azimuthal direction, and the propagation of vortexes were generally fixed into cylindrical waveguides owing to energy divergence. The propagation and manipulation of acoustic vortexes in three-dimensional (3D) free space, caused by AMs with two-dimensional (2D) aperiodic phase gradients, still pose a great challenge. Here, we experimentally demonstrate two types of switchable acoustic lenses with focusing and Bessel vortexes. Based on the GSL extension, by separating and attaching 2D dual-layer aperiodic AMs in both lenses, the switch between the reflected focusing vortex and transmitted focusing/Bessel vortex with the same focus length and topological charge in 3D free space can be observed. The designed dual-layer AMs can realize the short-range and long-range focusing vortexes in 3D free space and also have the advantage of convenient function switching, which may pave the way for designing switchable focusing vortex lenses with practical applications.
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21 October 2024
Research Article|
October 25 2024
Acoustic metagrating focusing and Bessel vortexes
Ke-qi Zhao
;
Ke-qi Zhao
(Investigation, Validation, Writing – original draft)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
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Hong-yu Zou
;
Hong-yu Zou
(Conceptualization, Investigation, Validation, Writing – original draft)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
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Yu-han Xia;
Yu-han Xia
(Investigation)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
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Cheng-hao Wu;
Cheng-hao Wu
(Validation)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
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Le-yang Xu
;
Le-yang Xu
(Investigation)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
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Yong Ge
;
Yong Ge
a)
(Funding acquisition, Supervision, Writing – review & editing)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
2
National Laboratory of Solid State Microstructures, Nanjing University
, Nanjing 210093, China
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Shou-qi Yuan
;
Shou-qi Yuan
(Funding acquisition, Supervision, Writing – review & editing)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
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Hong-xiang Sun
Hong-xiang Sun
a)
(Conceptualization, Funding acquisition, Supervision, Writing – review & editing)
1
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University
, Zhenjiang 212013, China
3
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences
, Beijing 100190, China
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Appl. Phys. Lett. 125, 171702 (2024)
Article history
Received:
July 27 2024
Accepted:
October 15 2024
Citation
Ke-qi Zhao, Hong-yu Zou, Yu-han Xia, Cheng-hao Wu, Le-yang Xu, Yong Ge, Shou-qi Yuan, Hong-xiang Sun; Acoustic metagrating focusing and Bessel vortexes. Appl. Phys. Lett. 21 October 2024; 125 (17): 171702. https://doi.org/10.1063/5.0230948
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