Subwavelength focusing and steering of spoof acoustic surface waves with aperiodic waveguide arrays

Author:

Xie Peng-Xiang1ORCID,Sheng Zong-Qiang1ORCID,Huang Ze-Xin1ORCID,-Hu Ping1ORCID,Wu Hong-Wei123ORCID

Affiliation:

1. School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology 1 , Huainan 232001, China

2. Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory 2 ), Hefei 230031, China

3. National Laboratory of Solid State Microstructures, Nanjing University 3 , Nanjing 210093, China

Abstract

In this study, we designed an acoustic waveguide by setting small periodic rigid plates to support spoof acoustic surface waves that can be freely controlled by tailoring the waveguide widths. When constructing acoustic waveguide arrays with parabolic refractive-index distributions, sound can be steered to focus on deep-subwavelength focal points, surpassing the diffraction limit. Theoretically, we used the Hamiltonian optics method to predict the focusing position and propagation trace of the spoof acoustic surface waves. Both simulated and experimental results demonstrate the theoretical prediction that the focusing point can be tuned lengthwise by changing the incident frequency and the lateral shifts by changing the incident angle. The results indicate that metal-like waveguide arrays can provide a feasible pathway for achieving compact and tunable sound focusing and super-resolution acoustic imaging on a subwavelength scale.

Funder

Major scientific research projects of colleges and universities in Anhui Province

University synergy innovation program of Anhui province

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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