Metamaterial-enabled wireless and contactless ultrasonic power transfer and data transmission through a metallic wall
Résumé
Wireless ultrasonic power transfer and data transmission through a metallic wall requires a direct contact of transducers with the wall owing to the significant impedance mismatch between the surrounding fluid and the wall. Here, a pillar-based acoustic metamaterial is proposed for wireless and contactless ultrasonic power transfer and data transmission through a metallic wall by leveraging the pillar's vertical elongation mode. Experiments conducted in water demonstrate a 33-fold power transmission enhancement (from 2% to around 66%) at approximately 450 kHz through a 1 mm thick metallic wall. Furthermore, our experiments show that a commercial light-emitting diode can be illuminated by harvesting the metamaterial-enhanced transmission of ultrasonic energy, which would not have been possible with the metallic wall alone even at an input voltage approximately five times greater. In addition, data transmission through the metallic wall is demonstrated by employing amplitude shift keying modulation to transmit an image, showcasing the remarkable improvement in image quality enabled by the metamaterial. This study paves the way for a future generation of wireless and contactless ultrasonic power transfer and data transmission applications.
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