Investigation of Elastic Surface and Edge Modes in Finite-Size Three-Dimensional Phononic Crystals
* Presenting author
Three-dimensional (3D) phononic crystals exhibit the so-called 3D phononic bandgaps, which are frequency ranges where the propagation of elastic or acoustic waves is prohibited along all spatial directions. Phononic crystals have various potential applications, such as vibration suppression, noise isolation, waveguiding and filtering, etc. By appropriately terminating the 3D phononic crystals, the elastic waves can be guided on the surface and/or the edge of the finite-size crystals. In this work, the 3D-printed phononic crystal samples are experimentally investigated to assess the transmission spectra of the surface and edge modes in the finite-size phononic structures. And the experimental results show a good agreement with the theoretical predictions. The surface and edge modes may open up new avenues for the manipulation of elastic waves in periodic structures, and exhibit great potential for designing complex and compact phononic circuits.