2024/08/17 by Yeongtae Jang, Jang, Yeongtae, Beomseok Oh +5
Engineering · #Acoustic Wave Phenomena Research #Acoustic Wave Resonator Technologies #Applied Physics (physics.app-ph) #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #Ultrasonics and Acoustic Wave Propagation
paper · pdf · doi:10.48550/arxiv.2408.09146
openalex publication_date 2024/08/17 · openalex created_date 2024/09/14 · openalex updated_date 2026/07/28
Beyond the constraints of conservative systems, altering wave propagation frequency emerges as a crucial factor across diverse physical domains. This Letter demonstrates bi-directional asymmetric frequency conversion -- either upward or downward -- depending on the excitation direction in the elastic domain, moving beyond uni-directional approaches. We numerically and experimentally demonstrate its practical realization in a model system of cylindrical beam crystals, a type of granular crystal characterized by intrinsic local resonance. This novel wave transport mechanism operates through the interplay of nonlinear contact, spatial asymmetry, and the coupling of local resonance. Thanks to the proposed highly tunable architecture, we demonstrate various ways to manipulate wave transport, including tunable frequency conversion. Given that the local resonance we employ exemplifies avoided crossings (i.e., a strong coupling effect), our work may inspire investigations into diverse physical nonlinear domains that support material/structural resonance.