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

Kiyean Kim, Chung Il Park, Hyuk Lee and Yoon Young Kim ()
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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

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-07697-7

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