Mechanically Programmable Electromagnetic Metamaterials for Generalized Phase Tailoring With Zero Static Power...

Area of Science:

• Electromagnetic Metamaterials
• Materials Science
• Nanotechnology

Background:

• Mechanically modulated reconfigurable electromagnetic metamaterials offer flexible wavefront manipulation.
• Existing designs often require continuous external loading, leading to limited programmability and high power consumption.

Purpose of the Study:

• To present a mechanically programmable electromagnetic metamaterial with zero static power consumption.
• To enable generalized phase tailoring using 3D-printed shape memory polymers and specialized meta-atoms.

Main Methods:

• Integration of 3D-printed shape memory polymer (SMP) compression-torsion coupling structures with three-fold symmetric three-armed meta-atoms (C3 meta-atoms).
• Utilizing compression-torsion coupling for deterministic in-plane rotation of unit cells.
• Leveraging SMP's shape-locking and recovery for programmable phase patterns via mechanical coding and thermal resetting.

Main Results:

• Achieved full 0°-360° phase coverage with a narrow rotational range (0°-60°) due to C3 meta-atoms' phase amplification.
• Demonstrated arbitrary phase distribution patterns without sustained power consumption.
• Verified programmable functionalities including anomalous refraction, reconfigurable metalens, and orbital-angular-momentum (OAM) generators through simulations and experiments.

Conclusions:

• The developed metamaterial offers a low-energy, programmable, and reconfigurable approach to wavefront modulation.
• This work provides a conceptual framework for next-generation mechanically programmable electromagnetic metamaterials.
• The use of SMP enables rewritable phase patterns via thermal recovery, enhancing device versatility.