A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation

@article{Zhu2014APT,
  title={A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation},
  author={Hongfei Zhu and Fabio Semperlotti},
  journal={arXiv: Classical Physics},
  year={2014}
}
In this paper, we present an approach to ultrasonic beam-forming and beam-steering in structures based on the concept of embedded non-resonant acoustic metamaterial lenses. The lens design exploits the principle of acoustic drop-channel which enables the dynamic coupling of multiple ultrasonic waveguides at selected frequencies. In contrast with currently available technology, the embedded lens allows generating directional excitation by means of a single ultrasonic transducer. The lens design… 

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