15 March 2018 Passive metamaterial-based acoustic holograms in ultrasound energy transfer systems
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Contactless energy transfer (CET) is a technology that is particularly relevant in applications where wired electrical contact is dangerous or impractical. Furthermore, it would enhance the development, use, and reliability of low-power sensors in applications where changing batteries is not practical or may not be a viable option. One CET method that has recently attracted interest is the ultrasonic acoustic energy transfer, which is based on the reception of acoustic waves at ultrasonic frequencies by a piezoelectric receiver. Patterning and focusing the transmitted acoustic energy in space is one of the challenges for enhancing the power transmission and locally charging sensors or devices. We use a mathematically designed passive metamaterial-based acoustic hologram to selectively power an array of piezoelectric receivers using an unfocused transmitter. The acoustic hologram is employed to create a multifocal pressure pattern in the target plane where the receivers are located inside focal regions. We conduct multiphysics simulations in which a single transmitter is used to power multiple receivers with an arbitrary two-dimensional spatial pattern via wave controlling and manipulation, using the hologram. We show that the multi-focal pressure pattern created by the passive acoustic hologram will enhance the power transmission for most receivers.
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Marjan Bakhtiari-Nejad, Marjan Bakhtiari-Nejad, Ahmed Elnahhas, Ahmed Elnahhas, Muhammad R. Hajj, Muhammad R. Hajj, Shima Shahab, Shima Shahab, "Passive metamaterial-based acoustic holograms in ultrasound energy transfer systems", Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 1059518 (15 March 2018); doi: 10.1117/12.2296741; https://doi.org/10.1117/12.2296741

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