Acoustic metamaterials exhibit a transmission band gap in the sonic range, due to the existence of both a negative bulk modulus and negative mass density at the material's resonant frequency. By taking advantage of the control offered by microfluidic devices, we can fabricate resonators from monodisperse double emulsions. The double emulsion drops include an inner fluid that is a suspension surrounded by a curable liquid rubber. These drops are collected in solution where the core is consolidated in order to achieve a higher volume fraction and the shell crosslinks, forming the resonator. Resonators can be fabricated with diameters ranging from 100 �m to 5 mm. Dried resonators are embedded in an epoxy matrix to form the acoustic metamaterial. This method of rapid fabrication with precise control over the resonator properties will result in the ability to attenuate specific frequencies. This should then lead to other metamaterial applications currently being investigated such as acoustic waveguiding.

Design and fabrication of localized resonators for acoustic metamaterial applications

246th National Meeting (2013)

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