Open AccessHigh-performance broadband electromagnetic interference shielding optical window based on a metamaterial absorber
Author(s) -
Yaqiang Zhang,
Hongxing Dong,
Nanli Mou,
Lulu Chen,
Rihong Li,
Long Zhang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.401766
Subject(s) - electromagnetic shielding , optics , materials science , metamaterial , metamaterial absorber , optoelectronics , microwave , electromagnetic interference , absorption (acoustics) , indium tin oxide , electromagnetic radiation , transmittance , polarization (electrochemistry) , physics , telecommunications , tunable metamaterials , thin film , chemistry , quantum mechanics , computer science , composite material , nanotechnology
An excellently transparent metamaterial-based electromagnetic interference (EMI) shielding window with broadband absorption is presented theoretically and demonstrated experimentally. The window is composed of double split circular ring (SCR) elements whose absorption spectra feature two mild resonant peaks. Indium-tin-oxide (ITO) with resonant patterns is utilized as the material to induce high ohmic loss and broaden the absorption bandwidth. The window achieves strong absorptivity, > 90%, covering an ultrawide frequency range of 7.8-18.0 GHz. Moreover, the measured shielding effectiveness (SE) of the window is > 18.25 dB, at 7.0-18.0 GHz, while the average optical transmittance is fixed at ∼73.10% in the visible-near-infrared (Vis-NIR) region of 400-1,500 nm. Further, the absorption mechanism is revealed by designing an equivalent circuit model and studying the distributions of the electric field and surface currents of the structure. Furthermore, a specific design feature also makes our device insensitive to the incident angle and the polarization state of the impinging microwave. The 90% absorption and shielding performance of the proposed optical window avail it for a wide range of great potential applications, such as the displays of military and medical precision devices.