@article{Huang2023, 
author = {Yihe Huang and Yize Li and Kewen Pan and Yixian Fang and Kai Chio Chan and Xiaoyu Xiao and Chao Wei and Kostya S Novoselov and John Gallop and Ling Hao and Zhu Liu and Zhirun Hu and Lin Li},
title = {A direct laser-synthesized magnetic metamaterial for low-frequency wideband passive microwave absorption},
year = {2023},
journal = {International Journal of Extreme Manufacturing},
volume = {5},
number = {3},
pages = {035503},
keywords = {Fe3O4 nanoparticles, wide bandwidth, laser direct writing, degrees of crystallization, low frequency},
url = {https://www.sciopen.com/article/10.1088/2631-7990/acdb0c},
doi = {10.1088/2631-7990/acdb0c},
abstract = {Microwave absorption in radar stealth technology is faced with challenges in terms of its effectiveness in low-frequency regions. Herein, we report a new laser-based method for producing an ultrawideband metamaterial-based microwave absorber with a highly uniform sheet resistance and negative magnetic permeability at resonant frequencies, which results in a wide bandwidth in the L- to S-band. Control of the electrical sheet resistance uniformity has been achieved with less than 5% deviation at 400 Ω sq−1 and 6% deviation at 120 Ω sq−1, resulting in a microwave absorption coefficient between 97.2% and 97.7% within a 1.56–18.3 GHz bandwidth for incident angles of 0°–40°, and there is no need for providing energy or an electrical power source during the operation. Porous N- and S-doped turbostratic graphene 2D patterns with embedded magnetic nanoparticles were produced simultaneously on a polyethylene terephthalate substrate via laser direct writing. The proposed low-frequency, wideband, wide-incident-angle, and high-electromagnetic-absorption microwave absorber can potentially be used in aviation, electromagnetic interference (EMI) suppression, and 5G applications.}
}