title: A Soft 3D Acoustic Metafluid with Dual-Band Negative Refractive Index.
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.
authors.affiliation: CRPP, University of Bordeaux, CNRS, UPR 8641, Pessac, 33600, France.
authors.forename: Simon
authors.initials: S
authors.lastname: Raffy
authors.affiliation: INPB, University of Bordeaux, CNRS, I2M-APY, UMR 5295, Talence, 33405, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Mascaro
authors.affiliation: INPB, University of Bordeaux, CNRS, I2M-APY, UMR 5295, Talence, 33405, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Brunet
authors.affiliation: CRPP, University of Bordeaux, CNRS, UPR 8641, Pessac, 33600, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Mondain-Monval
authors.affiliation: Solvay, LOF, University of Bordeaux, CNRS UMR 5258, Pessac, 33600, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Leng
keywords: acoustic metamaterials; metafluids; microfluidics; sol-gels; xerogels