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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Liquid Metal Grid Patterned Thin Film Devices Toward Absorption-Dominant and Strain-Tunable Electromagnetic

Yuwen Wei¹, Priyanuj Bhuyan², Suk Jin Kwon³

¹Department of Polymer-Nano Science and Technology, Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju, 54896, Republic of Korea.

Nano-Micro Letters

|July 17, 2024

Summary

Researchers developed soft, stretchable thin films for electromagnetic interference (EMI) shielding. These absorption-dominant devices offer high shielding effectiveness (up to 75 dB) and tunable performance for flexible electronics.

Keywords:

Absorption-dominant electromagnetic interference shielding Liquid metals Soft and stretchable electronics Thin film devices Tunable electromagnetic interference shielding

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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh

Published on: June 23, 2017

Area of Science:

Materials Science
Electrical Engineering
Nanotechnology

Background:

Increasing demand for high-performance, deformable electromagnetic interference (EMI) shielding in soft and wearable electronics.
Traditional reflective shielding materials lack deformability and can cause secondary electromagnetic pollution.

Purpose of the Study:

To present soft and stretchable EMI shielding thin-film devices with absorption-dominant shielding behavior.
To overcome the limitations of rigid, reflective EMI shielding materials.

Main Methods:

Fabrication of devices using a liquid metal (LM) layer and an LM grid-patterned layer separated by an elastomeric film.
Utilizing aerosol deposition for superior adhesion of LM on elastomer.
Characterization of EMI shielding effectiveness (SE) and reflectance under various strain conditions.

Main Results:

Achieved high total EMI shielding effectiveness (SE_T) up to 75 dB with low reflectance (SE_R of 1.5 dB at resonant frequency).
Demonstrated absorption-dominant EMI shielding attributed to multiple internal reflections within LM grid architectures.
Exhibited excellent stretchability, enabling tunable shielding by adjusting grid spacing under strain (resonant frequency shift from 81.3 to 71.3 GHz @ 33% strain).
Maintained shielding effectiveness after multiple strain cycles.

Conclusions:

The developed LM-based thin films offer a powerful solution for EMI shielding in next-generation smart electronics.
The absorption-dominant and stretchable nature of the devices provides advanced EMI shielding capabilities for flexible applications.
This work presents a new paradigm for high-performance, deformable EMI shielding devices.