Abstract
How to modulate acoustic waves at small scales has been an area of intense investigation. In this paper, an artificial ultra-thin structure with a series of zigzag-shaped grooves located in the center and with bilateral symmetry is designed to realize ultra-strong directional collimated acoustic beams. The simulations agree well with the theoretical analysis, and show that the acoustic collimated structure has high directivity at the resonant frequency, with a beam length exceeding 40 wavelengths. The structure has deep subwavelength scales and a simple design, and is expected to have applications in fields such as directional acoustic radiation, medical ultrasound detection, etc.
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