Elastic Metasurface with Dual-Coupled Resonators for Highly Efficient Energy Harvesting

Highly efficient elastic wave manipulation is crucial in the materials and physical engineering com-munities. Recently, coupling-interaction theory has attracted extensive attention to enhance the efficiency of traditional metamaterials. Here, experimental demonstrations of an elastic focusing metasurface with a dual-coupled resonator for high-efficient energy harvesting are exhibited. An easy-to-implement optimized elastic metasurface with bridged coupling, which is higher efficiency than traditional elastic metasurfaces, is proposed. Results show that a significantly enhanced efficiency, up to 239% is achieved, compared with a conventional metasurface. Furthermore, the robustness of the enhanced efficiency against variation of the focal point and frequency fluctuations of the incident waves is observed. The suggested device provides a simple feasible method for high-efficient energy harvesting.