Coherent virtual absorption of elastodynamic waves

G. Trainiti, Y. Radi, M. Ruzzene, A. Alù

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Absorbers suppress reflection and scattering of an incident wave by dissipating its energy into heat. As material absorption goes to zero, the energy impinging on an object is necessarily transmitted or scattered away. Specific forms of temporal modulation of the impinging signal can suppress wave scattering and transmission in the transient regime, mimicking the response of a perfect absorber without relying on material loss. This virtual absorption can store energy with large efficiency in a lossless material and then release it on demand. Here, we extend this concept to elastodynamics and experimentally show that longitudinal motion can be perfectly absorbed using a lossless elastic cavity. This energy is then released symmetrically or asymmetrically by controlling the relative phase of the impinging signals. Our work opens previously unexplored pathways for elastodynamic wave control and energy storage, which may be translated to other phononic and photonic systems of technological relevance.

Original languageEnglish (US)
Article numbereaaw3255
JournalScience Advances
Volume5
Issue number8
DOIs
StatePublished - Aug 30 2019
Externally publishedYes

ASJC Scopus subject areas

  • General

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