Directly Printed 3D Soft Microwave Plasmonic Enhanced-Q Resonators by Decoupling from Lossy Media

Area of Science:

• Soft electronics
• Electromagnetics
• Materials science

Background:

• Current soft electronic designs are limited to 2D/2.5D, hindering 3D structural integrity.
• Dielectric losses in elastomeric substrates limit performance of electromagnetic devices like resonators.

Purpose of the Study:

• To propose directly printed 3D electromagnetic soft plasmonic enhanced-quality (Q) factor resonators.
• To overcome limitations of 2D/2.5D designs and substrate-induced dielectric losses.

Main Methods:

• Incorporation of an immiscible solvent into an elastomer matrix to form emulsion phases.
• Fabrication of 3D-printed structures using highly conductive composites.
• Integration of a coplanar ground plane to decouple resonators from substrates.

Main Results:

• Demonstrated 3D microwave plasmonic resonators with high design freedom (e.g., pillars, hooks).
• Achieved a 3.4-fold enhancement in Q-factor (octupole mode) compared to 2D resonators by leveraging resonance in air.
• Enabled stable resonator operation on high-permittivity surfaces like human skin.
• Showcased wireless deformation-sensing capabilities for simultaneous strain amplitude and orientation detection.

Conclusions:

• Directly printed 3D soft plasmonic resonators offer superior performance and design flexibility.
• The developed resonators overcome substrate loss issues, enabling new applications in soft electronics.
• This technology paves the way for advanced sensing applications, including wireless deformation monitoring.