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A Soft 3D Acoustic Metafluid with Dual‐Band Negative Refractive Index
Author(s) -
Raffy Simon,
Mascaro Benoit,
Brunet Thomas,
MondainMonval Olivier,
Leng Jacques
Publication year - 2016
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201601078
Subject(s) - materials science , refractive index , shear modulus , sound (geography) , acoustics , shear (geology) , moduli , modulus , elastic modulus , matrix (chemical analysis) , dual (grammatical number) , optics , composite material , physics , optoelectronics , art , literature , quantum mechanics
Spherical silica xerogels are efficient acoustic Mie resonators. When these inclusions are dispersed in a fluid matrix, the final material may display a negative acoustic refractive index upon a set of precise constraints concerning thematerial properties, concentration, size and dispersity of inclusions. Because xerogels may sustain both pressure and shear waves (while only longitudinal waves propagate in the matrix), several bands with negative index can be tailored. Here we quantify theoretically such a possibility and demonstrate it experimentally by engineering calibrated particles of silica xerogels using microfluidics. We find that Poissons ratio of the inclusions is a key descriptor of these 3D metafluids.