Superabsorption of acoustic waves with bubble metascreens

Abstract

A bubble metascreen, i.e., a single layer of gas inclusions in a soft solid, can be modeled as an acoustic open resonator, whose behavior is well captured by a simple analytical expression. We show that by tuning the parameters of the metascreen, acoustic superabsorption can be achieved over a broad frequency range, which is confirmed by finite element simulations and experiments. Bubble metascreens can thus be used as ultrathin coatings for turning acoustic reflectors into perfect absorbers.Received 6 October 2014Revised 3 December 2014DOI:https://doi.org/10.1103/PhysRevB.91.020301©2015 American Physical Society