Reconfigurable Phononic-Crystal Circuits Formed by Coupled Acoustoelastic Resonators

Steering waves is slick, but what if one wants to change the waveguide to achieve a different response? The authors propose on-demand guiding of acoustic waves in a solid phononic crystal with holes, by filling a selected sequence of holes with a fluid. Waves are conducted by the coupling of adjacent resonating fluid cavities, while propagation in the solid is completely forbidden. Arbitrary phononic circuits could be reconfigured at will, simply by filling or emptying the chosen holes.