The emergence of low-frequency dual Fano resonances in chiral twisting metamaterials

Abstract

We describe innovative designs of chiral mechanical metamaterials with a twist feature that induces Fano-resonances with a relatively high quality factor. Through a finite element analysis, we delineate the phononic dispersion curves and transmission responses provided by a syndiotactic symmetry configuration, which we contrast to the ones of homogeneous medium, isotactic nonchiral, and isotactic chiral beams. We demonstrate that the beam with the chiral syndiotactic cell based on the two octagonal plates exhibits dual Fano resonances at low frequencies. Finally, we explore the prospect of applying syndiotactic beam metamaterials as temperature sensors with significant sensitivity and quality factors for the proposed size at the vicinity of frequencies investigated. The dissipation effects influencing the acoustic wave attenuation in both solids and liquids, which may result in a decrease in the quality factors, are appropriately accounted for.