A Self-Assembled Metamaterial for Lamb Waves

TL;DR

This paper presents a novel self-assembled acoustic metamaterial composed of microspheres on a membrane, demonstrating hybridization of Lamb waves with microsphere resonances, advancing understanding of microscale contact mechanics.

Contribution

The study introduces a self-assembled metamaterial with microspheres that hybridize Lamb waves, supported by experimental characterization and analytical modeling.

Findings

Identification of microsphere contact resonance and spheroidal resonance.

Observation of hybridization between Lamb waves and microsphere resonances.

Analytical model accurately describes the dispersion curves.

Abstract

We report the design and characterization of a self-assembled, locally resonant acoustic metamaterial for Lamb waves, composed of a monolayer of $1.02$ $\mu$m polystyrene microspheres adhered to a $1.3$ $\mu$m thick free-standing silicon membrane. A laser-induced transient grating technique is used to generate Lamb waves in the metamaterial and measure its acoustic response. The measurements reveal a microsphere contact resonance and the lowest frequency spheroidal microsphere resonance. The measured dispersion curves show hybridization of flexural Lamb waves with the microsphere contact resonance. We compare the measured dispersion with an analytical model using the contact resonance frequency as a single fitting parameter, and find that it well describes the observed hybridization. Results from this study can lead to an improved understanding of microscale contact mechanics and to the design of new types of acoustic metamaterials.