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Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing

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  • Kiyean Kim

    (Seoul National University)

  • Chung Il Park

    (Seoul National University)

  • Hyuk Lee

    (Seoul National University)

  • Yoon Young Kim

    (Seoul National University)

Abstract

In spite of the extensive studies of zero-index metamaterials, the realization of zero impedance with finite phase velocity has not been explored. Here, we show that this extreme case, realized by elaborately-tuned paired resonators, can effectively enhance sensing and actuation. To explain the formation mechanism of the near-zero effective impedance with finite phase velocity by paired resonators at a target frequency, a theory using an equivalent model based on mechanical longitudinal waves is developed. If the frequency of the extreme property is further tuned at a Fabry–Pérot resonance frequency, highly efficient enhancement is possible. Experiments using a piezoceramic transducer (PZT) installed on the plate region bounded by two resonators confirm that the proposed extreme property mechanism highly enhances the sensing and actuation outputs of the transducer.

Suggested Citation

  • Kiyean Kim & Chung Il Park & Hyuk Lee & Yoon Young Kim, 2018. "Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing," Nature Communications, Nature, vol. 9(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07697-7
    DOI: 10.1038/s41467-018-07697-7
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