Contribution
Poster cancelled: Sonic crystals with giant complete band-gaps
* Presenting author
Abstract:
It is known from solid-state physics that electron waves in a crystal lattice encounter propagation restrictions within specific energy bands. Analogous behavior has been observed in acoustics: periodic arrangements of contrasting materials form sonic lattices, which can manipulate sound waves. Unlike atomic lattices, they exhibit a step-like structural profile with distinct material boundaries.
Recently, we introduced a novel sonic crystal concept, featuring spatially continuous material parameters without abrupt transitions. We term this structure a function sonic crystal. Our analysis focuses on the impact of deviations from a step-function profile on the acoustic density of states and reveals a rapid convergence: even minimal shifts from the step-function induce significant alterations.
Further, our design can be approximated with a specific cylindrical configuration that operates effectively as a broadband filter. This setup demonstrates desired characteristics, such as the formation of flat bands paired with giant complete frequency gaps. By combining different numerical calculations with experimental validation via acoustic frequency response measurements, we highlight the practicality of our design for real-world scenarios.