High-performance locally resonant metamaterials represent the next frontier in materials technology due to their extraordinary properties obtained through materials design, enabling a variety of potential applications. The most exceptional feature of locally resonant metamaterials is the subwavelength size of their unit cells, which allows to overcome the limits in wave focusing, imaging and sound/vibration isolation. To respond to the fast evolution of these artificial materials and the increasing need for advanced and exceptional properties, the emergence of a new mechanism for wave mitigation and control consisting in a nonlinear interaction between propagating and evanescent waves has recently been theoretically demonstrated. Here, we present the experimental proof of this phenomenon: the appearance of a subharmonic transmission attenuation zone due to energy exchange induced by autoparametric resonance. These results pave the path to a new generation of nonlinear locally resonant metamaterials.
This research has been performed within the framework of the 4TU.High-Tech Materials Research Programme New Horizons in designer materials (www.4tu.nl/htm). Part of the research leading to these results (Zega/ Geers) has received funding from the European Research Council under the European Union’s Seventh Frame-work Programme (FP7/2007–2013)/ERC Grant Agreement No. .
|European Research Council
|Seventh Framework Programme