Janus elastic metasurface for flexural wave manipulation
Phys. Rev. Applied 24, 044060 – Published 20 October, 2025
DOI: https://doi.org/10.1103/4bsp-359q
Abstract
This paper is a contribution to the Physical Review Applied collection titled Phononics and Metamaterials.
Bidirectional asymmetric wave manipulation has gained increasing attention for its promising applications in developing multifunctional mechanical devices and controlling vibrations in various equipment. However, simultaneous flexible manipulation of bidirectional incident elastic waves remains a challenge for existing elastic metasurfaces. In this paper, we propose a class of Janus elastic metasurfaces (JEMs) capable of arbitrarily manipulating asymmetric wave fronts for bidirectional incident flexural waves over a broad frequency range. By incorporating multiple pillars asymmetric about the JEM, unitary reflection with the desired bianisotropic phase shift is realized. The underlying bianisotropic mechanisms stem from the decoupling of adjacent pillars when their spacing deviates from Fabry–Pérot resonance, together with the impedance mismatch at frequencies beyond the Fano resonance. Numerical simulations and experimental validations demonstrate various functionalities, such as broadband focusing, anomalous reflection, and self-bending. This work presents an approach for designing advanced elastic devices with multifunctional and broadband bidirectional wave front manipulation capabilities.
Physics Subject Headings (PhySH)
Collections
This article appears in the following collection:
Phononics and Metamaterials
Physical Review Applied is pleased to present a Collection on Phononics and Metamaterials, in which diverse developments in research on sound waves are gathered to offer a comprehensive view of both the state of the art and the challenges ahead. The Collection is dedicated to the memory of Dr. Sarah Benchabane (1980–2024), honoring her outstanding contributions to phononics and wave physics. Contributions to this Collection will be published beginning in 2025 and continuing into 2026. This Collection is being curated by Guest Editors Muamer Kadic, Daniel Torrent, and Abdelkrim Khelif.
