Experimental realization of ultrasonic retroreflection tweezing via metagratings

Long-Sheng Zeng; Ya-Xi Shen; Xin-Sheng Fang; Yong Li; Xue-Feng Zhu

doi:10.1016/j.ultras.2021.106548

Experimental realization of ultrasonic retroreflection tweezing via metagratings

Ultrasonics. 2021 Dec:117:106548. doi: 10.1016/j.ultras.2021.106548. Epub 2021 Aug 13.

Authors

Long-Sheng Zeng¹, Ya-Xi Shen¹, Xin-Sheng Fang², Yong Li³, Xue-Feng Zhu⁴

Affiliations

¹ School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074, PR China.
² Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, PR China.
³ Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: yongli@tongji.edu.cn.
⁴ School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074, PR China. Electronic address: xfzhu@hust.edu.cn.

PMID: 34438222
DOI: 10.1016/j.ultras.2021.106548

Abstract

Acoustic tweezing and contactless object manipulation are significant and has become a research hotspot. Here, we present a prototype of retroreflection tweezer based on the metagratings, which can be used for implementing particle levitation and contactless movement. Different from previous tweezers, where the standing wave was typically generated from normal incidence, the retroreflection tweezer proposed here operates for the oblique incidence case that provides more degrees of freedom for real-time observation. We also give the exact relation between the metagrating geometries and retroreflection angles in a wide range based on the grating theory and optimization algorithm. Experiments are conducted to show the retroreflection at a preset angle on the designed metagrating, where levitation and contactless movement of particles are demonstrated.

Keywords: Acoustic meta-grating; Acoustic radiation force; Particle trapping; Retroreflection.