Abstract
Acoustic holography has extensive possibilities in acoustic sensing, acoustic illusion, contactless particle manipulation, and medical imaging. Based on coating unit cells and perforated panels, an acoustic composite metasurface is constructed with a decoupled modulation of phase and amplitude, which has been used to design acoustic holography. This proposal not only has lower complexity than conventional acoustic holography of active arrays due to the avoidance of complex structures and circuits but also provides more flexibility than acoustic holography based on the acoustic metasurface with phase-only modulation benefitting from the efficient decoupled modulation of phase and amplitude. We have further demonstrated three acoustic holographic applications, such as multi-directional transmission, multi-focal focusing, and holographic imaging. Due to the low complexity and the great flexibility, this proposal has potential to achieve the high-quality holograms with high information content, fine resolution, and large scale.
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