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

Area of Science:

• Electromagnetic Metamaterials
• Materials Science
• Nanotechnology

Background:

• Mechanically tunable metamaterials offer wavefront manipulation but suffer from limited programmability and high power consumption.
• Existing designs often rely on collective deformations and continuous external loading, restricting their practical applications.

Purpose of the Study:

• To develop a mechanically programmable electromagnetic metamaterial with zero static power consumption.
• To achieve generalized phase tailoring and flexible wavefront modulation using shape memory polymers.

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 SMP's shape-locking and shape-recovery properties for mechanical coding and thermal rewriting of phase patterns.
• Employing compression-torsion coupling for deterministic, independent in-plane rotation of unit cells.

Main Results:

• Achieved full 0°-360° phase coverage with a narrow rotational angular range (0°-60°) due to C3 meta-atoms' phase amplification.
• Demonstrated programmable functionalities including anomalous refraction, reconfigurable metalenses, and orbital-angular-momentum (OAM) generators.
• Verified zero static power consumption for arbitrary phase distribution patterns.

Conclusions:

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