Ultrasonic braided ring beams generated by phase modulation metasurfaces

Author:

Wang Jia-Yue1ORCID,Li Xin-Rui12ORCID,Zhu Xing-Feng13ORCID,Yao Jie13ORCID,Wei Qi13ORCID,Wu Da-Jian1ORCID

Affiliation:

1. Jiangsu Key Lab of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University 1 , Nanjing 210023, China

2. Department of Architecture, College of Design and Environment, National University of Singapore 2 , Singapore 117566, Singapore

3. MOE Key Laboratory of Modern Acoustics, School of Physics, Nanjing University 3 , Nanjing 210093, China

Abstract

Coaxial coupling between two quasi-perfect ultrasonic vortices (QPUVs) with distinct ring radii and topological charges (TCs) has been suggested and implemented to create ultrasonic braided ring beams (UBRBs). It is possible to switch between a double-ring pattern, a braided ring pattern, and a petal-like pattern in the linked ultrasonic field distribution by varying the coupling strength of two QPUVs. We focus on the braided ring pattern and investigate the influence of TCs on the acoustic intensity and phase distributions. It is found that the UBRB contains multiple individual phase singularities, and the number of singularities is determined by the TCs of the two QPUVs. Furthermore, a phase modulation metasurface (PMM) composed of photosensitive resin cubes is well designed to produce the UBRB in water. The effectiveness of the single-layer PMM in producing the UBRB is confirmed by both simulations and experimental results. The proposed UBRBs based on metasurfaces could potentially have uses in multi-particle manipulation and acoustic communication.

Funder

National Natural Science Foundation of China

Publisher

AIP Publishing

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