A Soft 3D Acoustic Metafluid with Dual-Band Negative Refractive Index

Simon Raffy; Benoit Mascaro; Thomas Brunet; Olivier Mondain-Monval; Jacques Leng

doi:10.1002/adma.201503524

A Soft 3D Acoustic Metafluid with Dual-Band Negative Refractive Index

Adv Mater. 2016 Mar 2;28(9):1760-4. doi: 10.1002/adma.201503524. Epub 2015 Dec 15.

Authors

Simon Raffy¹, Benoit Mascaro², Thomas Brunet², Olivier Mondain-Monval¹, Jacques Leng³

Affiliations

¹ CRPP, University of Bordeaux, CNRS, UPR 8641, Pessac, 33600, France.
² INPB, University of Bordeaux, CNRS, I2M-APY, UMR 5295, Talence, 33405, France.
³ Solvay, LOF, University of Bordeaux, CNRS UMR 5258, Pessac, 33600, France.

PMID: 26671783
DOI: 10.1002/adma.201503524

Abstract

Spherical silica xerogels are efficient acoustic Mie resonators. When these sub-wavelength inclusions are dispersed in a matrix, the final metafluid may display a negative acoustic refractive index upon a set of precise constraints concerning material properties, concentration, size, and dispersity of the inclusions. Because xerogels may sustain both pressure and shear waves, several bands with negative index can be tailored.

Keywords: acoustic metamaterials; metafluids; microfluidics; sol-gels; xerogels.