Colloquium: Stopping and reversing sound by tuning microscopic drums

Friday, March 26, 2021 4:30pm to 5:30pm

The ability to trap and manipulate a signal is crucial for technologies ranging from sensors to computing devices. In this talk, we will demonstrate how to stop and reverse a sound pulse in a new class of programmable metamaterials. We show that this functionality is enabled by tuning the dispersion relation of a periodic metamaterial in real-time a mechanism we term dynamic dispersion tuning.

The necessary change in dispersion is achieved by the change in sign of an effective coupling between fundamental modes which generically leads to a nearly dispersionless or flat band at the transition point. We show how adiabatic tuning of the band dispersion can immobilize and reverse the propagation of a sound pulse in simulations of a one-dimensional resonator chain.

This virtual colloquium is hosted by the Department of Physics and Astrophysics at UND.

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