Timoshenko-Ehrenfest Beam-Based Reconfigurable Elastic Metasurfaces for Multifunctional Wave Manipulation

Area of Science:

• Materials Science
• Acoustics
• Mechanical Engineering

Background:

• Conventional elastic metasurfaces are frequency-specific and limited in application.
• Reconfigurable metasurfaces offer potential for versatile wave manipulation.

Purpose of the Study:

• To introduce a Timoshenko-Ehrenfest beam-based reconfigurable elastic metasurface.
• To achieve multifunctional wave phenomena (anomalous refraction, focusing, self-acceleration, total reflection) within a single substrate.
• To analyze the metasurface's dispersion relation using Timoshenko-Ehrenfest beam theory.

Main Methods:

• Assembly of components with varying geometries on a substrate for reconfigurability.
• Theoretical analysis of dispersion relation based on Timoshenko-Ehrenfest beam theory.
• Validation through full-wave harmonic simulations and experimental visualization.

Main Results:

• Demonstrated high transmission in the ultrabroadband frequency range.
• Successfully controlled multifunctional wave phenomena.
• Validated analytical model with numerical and experimental data.
• Enhanced piezoelectric energy harvesting performance.

Conclusions:

• The reconfigurable elastic metasurface provides unprecedented control over wave phenomena.
• The Timoshenko-Ehrenfest beam theory offers a robust analytical framework for elastic metasurfaces.
• Potential applications include structural health monitoring, wireless sensing, and the Internet of Things.