8 papers
Topological mode conservation and conversion in phononic crystals with temporal interfaces
Mahmoud M. Samak, Osama R. Bilal
A sudden change in material properties creates a temporal interface and forces a propagating wave to change its frequency while preserving its wavenumber. In contrast to monoatomic…
Hierarchical metamaterials with tunable flat bands, zero-frequency, and wavenumber gaps
Mohamed A. Elgamal, Osama R. Bilal
Metamaterials are arrangement of basic building blocks that repeat in space, time, or both. These material systems serve as an excellent platform for controlling waves, such as eng…
Ultra-lightweight multi-functional gyroid-based metamaterial for simultaneous sound insulation, vibration suppression, and impact mitigation in all directions
Evan Kluge, Osama R. Bilal
Multi-functional materials are increasingly essential in many applications due to their ability to serve multiple purposes, simultaneously. Metamaterials can offer tailored functio…
Harnessing curvature for helical wave generation in spiral-based metamaterial structures
Mohamed Roshdy, Osama R. Bilal
Linearly polarized elastic waves propagating in a linear path have been extensively explored in numerous applications from biomedical imaging to structural health monitoring. Howev…
Observation of dispersion anomalies by design
Mahmoud M. Samak, Osama R. Bilal
Band structures encode electronic, optical, and acoustic properties of matter and can serve as an essential tool in material discovery and design. Dispersion anomalies -- sharp, no…
Experimental observation of flow instability control by metamaterial subsurfaces
Melanie Keogh, Jensen McTighe, Jason Dahl +1
Flow instabilities within a fluid flow can cause laminar-to-turbulent transition over surfaces. These instabilities can result from upstream, wake-generating disturbances, leading…