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In this study, we investigate the phenomenon of mode conversion in elasticbulk waves using coupled hexapole resonances. A metamaterial slab is proposedenabling the complete conversion between longitudinal and transverse modes.Each unit of the elastic metamaterial slab comprises a pair of scatterers, andtheir relative direction is oriented at an oblique angle. The interactionbetween the coupled hexapoles and the background results in obliquedisplacements, which are responsible for the mode conversion. Moreover, thisconversion exhibits a broader frequency range compared to the quadrupoleresonance. This innovative design significantly broadens the range ofpossibilities for developing mode-converting metamaterials.

Complete mode conversion for elastic waves reflected by elastic metamaterial slab with double hexapole resonances