Broadband Airy-like beams by coded acoustic metasurfaces

• DOI: 10.1063/1.5080202
• Publication Date: 2019-02-06T16:48:40Z
• Authors: Di-Chao Chen; Xing-Feng Zhu; Da-Jian Wu; Xiao-Jun Liu
• Keywords: Folding (DSP implementation)

We propose a coded acoustic metasurface (CAM) to generate Airy-like beams (ALBs) in air. A space-folding structure is designed act as the bit “1” unit of CAM, and an air with same size used “0”. Finite-element simulations demonstrate that ALBs generated by this simple CAM have excellent self-accelerating, self-healing, non-diffracting features. It found works well large frequency range 6–9 kHz, therefore, generates broadband ALB. Furthermore, two symmetrical CAMs are employed compose lens for realizing focusing focal length sensitive working frequency. The work presented here could greatly benefit imaging, particle trapping manipulation, acoustical devices.