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Forward and Backward Multibeam Scanning Controlled by a Holographic Acoustic Metasurface

Md Tausif Akram, Jun-Young Jang, and Kyungjun Song*

  • Department of Mechanical Engineering, Pusan National University, Geumjeong-Ku, Busan 46241, Republic of Korea

  • *song3396@pusan.ac.kr
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Phys. Rev. Applied 18, 024008 – Published 2 August, 2022

DOI: https://doi.org/10.1103/PhysRevApplied.18.024008

Abstract

Acoustic metasurfaces have great potential in the field of beam-forming acoustic antennas due to their thin, two-dimensional, and miniature artificial materials that can freely control sound waves. Here, we propose an acoustic metasurface, with multibeam acoustic radiation serving as leaky-wave antennas used for acoustic beam steering. Based on the holographic principle, we pattern a sinusoidal modulated admittance surface, which is designed as a periodic arrangement of cylindrical holes with varying depth profiles. An omnidirectional sound generated from a tiny hole located at the center of the patterned plate creates acoustic surface waves on the modulated surface while simultaneously generating leaky-wave radiation. For multibeam steering, the holographic admittance surfaces are designed with multiple subregions of the metasurface, with each subregion emitting single-beam radiation in the desired direction. Furthermore, the holographic metasurfaces are programmed separately to have forward and backward leaky-wave radiation. In this study, we use three-dimensional additive fabrication to print acoustic holograms to craft the surface-admittance variation at subwavelength resolution. Experimental results on these printed holograms show multidirectional acoustic beam steering in close agreement with the theoretical analysis and numerical results. Forward and backward multibeam frequency scanning is also demonstrated by frequency variation. Thus, we expect that this planar surface can be used in applications such as acoustic communications, levitation, and imaging.

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Phys. Rev. Applied 18, 024008– Published 2 August, 2022
  • Received 24 August 2021
  • Revised 3 January 2022
  • Accepted 11 April 2022
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