The effect of electro-momentum coupling on unidirectional zero reflection in layered generalized Willis Metamaterials
Abstract
Piezoelectric materials with asymmetric microstructures have emerged in elastodynamics as generalized Willis media to create an additional cross-coupling, termed electro-momentum coupling, which offers a new degree of freedom to manipulate mechanical waves. In this study, we present numerical simulations of the scattering of longitudinal waves in layered piezoelectric Willis metamaterials. Based on the asymmetry of reflection amplitudes due to the electro-momentum coupling, a topology optimization approach is employed to design a one-way zero reflection system with the introduction of material loss to control the asymmetric reflection amplitudes and embrace non-Hermitian physics. We conduct two topology optimization studies to design unit cells connected either with or without external electric control. The modeling of wave propagation shows the effects of both classical Willis coupling and electro-momentum coupling for each wave propagation study.
Details
- Organisation(s)
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Institute of Photonics
- External Organisation(s)
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Boston University (BU)
Bauhaus-Universität Weimar
Tongji University
- Type
- Article
- Journal
- Extreme Mechanics Letters
- Volume
- 77
- No. of pages
- 11
- Publication date
- 06.2025
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Bioengineering, Chemical Engineering (miscellaneous), Engineering (miscellaneous), Mechanics of Materials, Mechanical Engineering
- Electronic version(s)
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https://doi.org/10.1016/j.eml.2025.102318 (Access:
Closed
)
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Details in the research portal "Research@Leibniz University"
