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Polar Metamaterials: A New Outlook on Resonance for Cloaking Applications
H Nassar1, Y Y Chen1, G L Huang1
1Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, USA.
Physical Review Letters
|March 14, 2020
Summary
Rotationally resonant metamaterials exhibit polar and chiral behavior, enabling transformation-based passive cloaking. This breakthrough demonstrates a new class of elastic metamaterials with potential applications in advanced wave manipulation.
Area of Science:
- Physics
- Materials Science
- Engineering
Background:
- Transformation-invariant elastic materials and passive cloaking remain theoretical challenges.
- Metamaterials offer unique properties through engineered structures.
Purpose of the Study:
- To investigate the existence of transformation-invariant elastic materials.
- To explore the possibility of transformation-based passive cloaking using metamaterials.
Main Methods:
- Utilizing rotationally resonant metamaterials with tailored lattice geometries.
- Inducing polar and chiral behavior by modifying angular momentum balance.
- Employing numerical tests to evaluate cloaking performance.
Main Results:
- Demonstrated polar and chiral behavior in metamaterials due to rotational resonance.
- Developed metamaterials that act as building blocks for cloaking devices.
- Achieved satisfactory cloaking performance against pressure and shear waves.
Conclusions:
- Rotational resonance in metamaterials can lead to transformation-invariant properties.
- This research validates the concept of transformation-based passive cloaking in elastodynamics.
- The findings advance the field of transformation elastodynamics, paralleling advancements in acoustics and optics.
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