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

TL;DR

This paper demonstrates the design of chiral twisting metamaterials that exhibit dual low-frequency Fano resonances, advancing mechanical wave filtering and detection capabilities.

Contribution

It introduces a novel chiral cell configuration with syndiotactic symmetry that produces dual Fano resonances at low frequencies.

Findings

Dual Fano resonances observed at low frequencies

Enhanced quality factor in the metamaterial design

Potential application in mechanical wave filtering and sensing

Abstract

In the current work, through a finite element analysis, we demonstrate that a configuration of chiral cells having syndiotactic symmetry provides dual Fano resonances at low frequency. From the phononic dispersion and transmission response, we compare the signature provided by a composite made of chiral cells to the ones of homogeneous medium, isotactic nonchiral, and isotactic chiral beams. The study results in an innovative design of a mechanical metamaterial that induces the Fano resonance at low frequency with a relatively high quality factor. This might be a significant step forward for mechanical wave filtering and detection. Performances have been evaluated using a sensor that will be implemented as a thermometer.