Temporal Refraction in an Acoustic Phononic Lattice
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1.
California Institute of Technology
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2.
Bowdoin College
Abstract
In this Letter, we present the first experimental demonstration of the temporal refraction of acoustic waves in a phononic lattice. A step change in grounding stiffness results in a discontinuous change in group velocity across a so-called temporal boundary. This leads to frequency translation of incident signals, which maintain constant wavelength. We use the system to construct phononic analogs of the classical Snell and Fresnel relationships for temporal boundaries, providing evidence of temporal refraction. Last, we propose the ability to design systems to achieve tunable slow sound.
Copyright and License
© 2024 American Physical Society
Acknowledgement
This material is based upon work supported by the U.S. National Science Foundation under Grants No. DGE1745301 (B. L. K.) and No. DMS-2107945 (C. C.). This work was also (partially) supported by the Science and Technology Center New Frontiers of Sound (NewFoS) through NSF Grant No. 2242925 (C. D.).
Additional Information
We add a Supplemental Material document to address critical considerations of the experimental lattice, including friction, the role of the spatial boundaries, and the lattice size: main_Supp.pdf
Files
PhysRevLett.133.077201.pdf
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(1.9 MB)
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Additional details
Identifiers
- ISSN
- 1079-7114
Related works
- Is supplemented by
- Supplemental Material: https://journals.aps.org/prl/supplemental/10.1103/PhysRevLett.133.077201/main_Supp.pdf (URL)
Funding
- National Science Foundation
- DGE1745301
- National Science Foundation
- DMS-2107945
- National Science Foundation
- 2242925
Dates
- Accepted
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2024-06-21Accepted