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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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A Novel Ultra-Wideband Electromagnetic-Wave-Absorbing Metastructure Inspired by Bionic Gyroid Structures.

Qing An¹, Dawei Li¹, Wenhe Liao¹

¹School of Mechanical Engineering (SME), Nanjing University of Science and Technology, 200 Xiao Ling Wei Road, Nanjing, 210094, China.

Advanced Materials (Deerfield Beach, Fla.)

|March 21, 2023

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This summary is machine-generated.

This study introduces a novel bioinspired electromagnetic (EM)-wave-absorbing metastructure with isotropic morphology. The innovative design achieves ultrawide absorption bandwidth (2-40 GHz) and stable performance across various angles and polarizations.

Area of Science:

Materials Science
Metamaterials
Electromagnetics

Background:

Traditional electromagnetic (EM)-wave-absorbing materials often exhibit narrow absorption bandwidths and limited incidence angles due to anisotropic structures.
Existing materials struggle to meet the demands for broadband and wide-angle EM-wave absorption in advanced applications.

Purpose of the Study:

To propose a novel EM-wave-absorbing metastructure with isotropic morphology inspired by natural gyroid microstructures.
To develop a matching redesign methodology for optimizing material and microstructure properties for enhanced EM-wave absorption.
To demonstrate an ultra-broadband and wide-angle EM-absorbing capability.

Main Methods:

Bioinspiration from Parides sesostris butterfly wings to design a gyroid microstructure.

Keywords:

additive manufacturing bionic design electromagnetic wave absorbers gyroid structures metastructures

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Development of a matching redesign methodology for material-subwavelength scale properties.

Fabrication using additive manufacturing (AM) followed by dipping processes with dielectric lossy materials.

Validation through electromagnetic simulations and experimental measurements.

Main Results:

The bioinspired metastructure achieved an ultrawide absorption bandwidth from 2 to 40 GHz (180% fractional bandwidth) at normal incidence.
Stable EM-wave absorption performance was observed up to 60° incidence angles for both transverse electric (TE) and transverse magnetic (TM) polarizations.
The study elucidated the synergistic mechanism between microstructure and material properties.

Conclusions:

The proposed bioinspired metastructure offers a new paradigm for designing ultra-broadband and wide-angle EM-absorbing materials.
The gyroid microstructure and matching redesign methodology are effective for overcoming limitations of traditional EM absorbers.
This work paves the way for advanced multifunctional materials in diverse technological fields.