title: Delivering sound energy along an arbitrary convex trajectory.
abstract: Accelerating beams have attracted considerable research interest due to their peculiar properties and various applications. Although there have been numerous research on the generation and application of accelerating light beams, few results have been published on the generation of accelerating acoustic beams. Here we report on the experimental observation of accelerating acoustic beams along arbitrary convex trajectories. The desired trajectory is projected to the spatial phase profile on the boundary which is discretized and sampled spatially. The sound field distribution is formulated with the Green function and the integral equation method. Both the paraxial and the non-paraxial regimes are examined and observed in the experiments. The effect of obstacle scattering in the sound field is also investigated and the results demonstrate that the approach is robust against obstacle scattering. The realization of accelerating acoustic beams will have an impact on various applications where acoustic information and energy are required to be delivered along an arbitrary convex trajectory.
authors.affiliation: 1] Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Centre for Advanced Microstructure, Nanjing University, Nanjing 210093, P. R. China [2] School of Electrical and Computer Engineering, RMIT University, Melbourne 3000, Australia.
authors.forename: Sipei
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Centre for Advanced Microstructure, Nanjing University, Nanjing 210093, P. R. China.
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Centre for Advanced Microstructure, Nanjing University, Nanjing 210093, P. R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Lu
authors.affiliation: 1] Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Centre for Advanced Microstructure, Nanjing University, Nanjing 210093, P. R. China [2] School of Electrical and Computer Engineering, RMIT University, Melbourne 3000, Australia.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Qiu
authors.affiliation: Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Centre for Advanced Microstructure, Nanjing University, Nanjing 210093, P. R. China.
authors.forename: Jianchun
authors.initials: J
authors.lastname: Cheng
authors.affiliation: School of Electrical and Computer Engineering, RMIT University, Melbourne 3000, Australia.
authors.forename: Ian
authors.initials: I
authors.lastname: Burnett