Perfect circular polarization of elastic waves in solid media

Jeseung Lee, Minwoo “Joshua” Kweun (), Woorim Lee, Hong Min Seung and Yoon Young Kim ()
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Jeseung Lee: Seoul National University
Minwoo “Joshua” Kweun: Department of Applied Nano Mechanics, Korea Institute of Machinery and Materials
Woorim Lee: Seoul National University
Hong Min Seung: Intelligent Wave Engineering Team, Korea Research Institute of Standards and Science
Yoon Young Kim: Seoul National University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Elastic waves involving mechanical particle motions of solid media can couple volumetric and shear deformations, making their manipulation more difficult than electromagnetic waves. Thereby, circularly polarized waves in the elastic regime have been little explored, unlike their counterparts in the electromagnetic regime, where their practical usage has been evidenced in various applications. Here, we explore generating perfect circular polarization of elastic waves in an isotropic solid medium. We devise a novel strategy for converting a linearly polarized wave into a circularly polarized wave by employing an anisotropic medium, which induces a so-far-unexplored coupled resonance phenomenon; it describes the simultaneous occurrence of the Fabry-Pérot resonance in one diagonal plane and the quarter-wave resonance in another diagonal plane orthogonal to the former with an exact 90° out-of-phase relation. We establish a theory explaining the involved physics and validate it numerically and experimentally. As a potential application of elastic circular polarization, we present simulation results demonstrating that a circularly polarized elastic wave can detect an arbitrarily oriented crack undetectable by a linearly polarized elastic wave.

Date: 2024
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DOI: 10.1038/s41467-024-45146-w

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