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Systematic Design and Experimental Demonstration of Transmission-Type Multiplexed Acoustic Metaholograms

机译：传输式多路复用声学元罗图的系统设计与实验演示

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摘要

Acoustic holograms have promising applications in sound-field reconstruction, particle manipulation, ultrasonic haptics, and therapy. This study reports on the theoretical, numerical, and experimental investigation of multiplexed acoustic holograms at both audio and ultrasonic frequencies via a rationally designed transmission-type acoustic metamaterial. The proposed metahologram is composed of two Fabry-Perot resonant channels per unit cell, which enables the simultaneous modulation of the transmitted amplitude and phase at two desired frequencies. In contrast to conventional acoustic metamaterial-based holograms, the design strategy proposed here provides a new degree of freedom (frequency) that can actively tailor holograms that are otherwise completely passive and significantly enhances the information encoded in acoustic metamaterials. To demonstrate the multiplexed acoustic metamaterial, the projection of two different high-quality metaholograms is first shown at 14 and 17 kHz, with the patterns of the letters N and S. Then, two-channel ultrasound focusing and annular beams generation for the incident ultrasonic frequencies of 35 and 42.5 kHz are demonstrated. These multiplexed acoustic metaholograms offer a technical advance to tackle the rising challenges in the fields of acoustic metamaterials, architectural acoustics, and medical ultrasound.
机译：声信息全息图具有在声场重建，粒子操纵，超声波触觉和治疗中的有希望的应用。本研究报告了通过合理设计的传输型声学超材料在音频和超声波频率下复用声学全息图的理论，数值和实验研究。所提出的Metaholographic由每个单元电池的两个法布里 - 珀罗共振通道组成，其能够在两个所需频率下同时调制透射幅度和相位。与传统的声学超材料全息图相比，这里提出的设计策略提供了一种新的自由度（频率），其能够主动定制完全被动的全息图，并且显着增强了声学超材料中编码的信息。为了展示多路复用的声学超材料，首先在14和17 kHz中示出了两个不同的高质量元罗图的投影，其中字母N和S的图案。然后，入射超声波的双通道超声聚焦和环形光束产生证明了35和42.5 kHz的频率。这些多路复用的声学Metaholography提供技术进步，以解决声学超材料，建筑声学和医学超声领域的上升挑战。

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