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Published November 9, 2018 | Submitted + Supplemental Material + Published
Journal Article Open

Observation of Nonreciprocal Wave Propagation in a Dynamic Phononic Lattice


Acoustic waves in a linear time-invariant medium are generally reciprocal; however, reciprocity can break down in a time-variant system. In this Letter, we report on an experimental demonstration of nonreciprocity in a dynamic one-dimensional phononic crystal, where the local elastic properties are dependent on time. The system consists of an array of repelling magnets, and the on-site elastic potentials of the constitutive elements are modulated by an array of electromagnets. The modulation in time breaks time-reversal symmetry and opens a directional band gap in the dispersion relation. As shown by experimental and numerical results, nonreciprocal mechanical systems like the one presented here offer opportunities to create phononic diodes that can serve for rectification applications.

Additional Information

© 2018 American Physical Society. Received 23 April 2018; published 9 November 2018. Y. W., B. Y., and C. D. acknowledge the support from the National Science Foundation under EFRI Grant No. 1741565. H. C., H. N., and G. H. acknowledge support from the National Science Foundation under EFRI Grant No. 1641078. B. Y. acknowledges the support from the Natural Science and Engineering Research Council of Canada NSERC. Y. W. and C. D. designed the experiment. Y. W. performed the experiments. B. Y. performed analytical and numerical modelling of the system. H. C., H. N., and G. H. performed analytical calculations on the dispersion curves. Y. W., B. Y., H. N., G. H., and C. D. wrote the manuscript. All authors interpreted the results and reviewed the manuscript.

Attached Files

Published - PhysRevLett.121.194301.pdf

Submitted - 1803.11503.pdf

Supplemental Material - NonReciprocalPaper_20181005_Supp.pdf


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August 19, 2023
October 18, 2023