Temperature-controlled spatiotemporally modulated phononic crystal for achieving nonreciprocal acoustic wave propagation

Justin Palacios (1) , Lazaro Calderin (1) , Allan Chon (1) , Ian Frankel (2) , Jihad Alqasimi (3) , Florian Allein (2) , Rachel Gorelik (1) , Trevor Lata (1) , Richard Curradi (1) , Gabrielle Lambert-Milak (1) , Anuja Oke (1) , Neale Smith (1) , Maroun Abi Ghanem (2) , Pierre Lucas (1) , Nicholas Boechler (2) , Pierre Deymier (1)

1 University of Arizona
2 UC San Diego - University of California [San Diego]
3 KFUPM - King Fahd University of Petroleum and Minerals

We computationally investigate a method for spatiotemporally modulating a material's elastic properties, leveraging thermal dependence of elastic moduli, with the goal of inducing nonreciprocal propagation of acoustic waves. Acoustic wave propagation in an aluminum thin film subjected to spatiotemporal boundary heating from one side and constant cooling from the other side was simulated via the finite element method. Material property modulation patterns induced by the asymmetric boundary heating are found to be non-homogenous with depth. Despite these inhomogeneities, it will be shown that such thermoelasticity can still be used to achieve nonreciprocal acoustic wave propagation.

Mots clés: Thin films; Lamb waves; Acoustical properties; Elastic modulus; Phononic crystal; Acoustic wave propagation; Thermoelasticity; Finite-element analysis; Frequency modulation; Electronic band structure

Domaines: Acoustique [physics.class-ph]

Justin Palacios, Lazaro Calderin, Allan Chon, Ian Frankel, Jihad Alqasimi, et al.. Temperature-controlled spatiotemporally modulated phononic crystal for achieving nonreciprocal acoustic wave propagation. Journal of the Acoustical Society of America, 2022, 151 (6), pp.3669-3675. ⟨10.1121/10.0011543⟩. ⟨hal-03777908⟩