Session: 01-02-03: Phononic Crystals and Metamaterials

Paper Number: 145935

145935 - Evidence of Zero Group Velocity at the Lowest Dispersion Branch Through Local Interactions 

Zero group velocity (ZGV) modes can be utilized in many applications in both optics and acoustics. There exist numerous realizations of metamaterials with ZGVs at higher dispersion branches. However, to engineer the lowest dispersion branch to retain ZGVs, non-local metamaterials with couplings beyond the nearest neighbor are usually at play (i.e., roton-like dispersion). To date, there exists no realization of roton-like dispersion for the lowest branch without non-local couplings. Non-locality, while rich in dynamics, can render designs rather complex. Here, we provide the first experimental evidence of a ZGV point for the lowest dispersion branch within the first Brillouin zone with local interactions. We utilize nonlinear magnetic lattices as a platform to sculpt our dispersion. With the same platform, we can initiate many theoretical findings which can enable the realization of exotic metamaterials with simple designs.

Presenting Author: Mahmoud M Samak University of Connecticut

Presenting Author Biography: Graduate assistant and PhD student at university of Connecticut-United States.

Authors:

Mahmoud M Samak University of Connecticut
Osama R. Bilal University of Connectict