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Proceedings Paper

Passive metamaterial-based acoustic holograms in ultrasound energy transfer systems
Author(s): Marjan Bakhtiari-Nejad; Ahmed Elnahhas; Muhammad R. Hajj; Shima Shahab
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Paper Abstract

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.

Paper Details

Date Published: 15 March 2018
PDF: 9 pages
Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 1059518 (15 March 2018); doi: 10.1117/12.2296741
Show Author Affiliations
Marjan Bakhtiari-Nejad, Virginia Polytechnic Institute and State Univ. (United States)
Ahmed Elnahhas, Virginia Polytechnic Institute and State Univ. (United States)
Muhammad R. Hajj, Virginia Polytechnic Institute and State Univ. (United States)
Shima Shahab, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 10595:
Active and Passive Smart Structures and Integrated Systems XII
Alper Erturk, Editor(s)

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