Topological acoustic polaritons: robust sound manipulation at the subwavelength scale

Simon Yves, Romain Fleury, Fabrice Lemoult, Mathias Fink, Geoffroy Lerosey
2017 New Journal of Physics  
Topological insulators, a hallmark of condensed matter physics, have recently reached the classical realm of acoustic waves. A remarkable property of time-reversal invariant topological insulators is the presence of unidirectional spin-polarized propagation along their edges, a property that could lead to a wealth of new opportunities in the ability to guide and manipulate sound. Here, we demonstrate and study the possibility to induce topologically non-trivial acoustic states at the deep
more » ... elength scale, in a structured two-dimensional metamaterial composed of Helmholtz resonators. Radically different from previous designs based on non-resonant sonic crystals, our proposal enables robust sound manipulation on a surface along predefined, subwavelength pathways of arbitrary shapes.
doi:10.1088/1367-2630/aa66f8 fatcat:hcspokvaefgpjjsb5bagmfcyxy