High-performance broadband electromagnetic interference shielding optical window based on a metamaterial absorber
Autor: | Hongxing Dong, Nanli Mou, Yaqiang Zhang, Rihong Li, Long Zhang, Lulu Chen |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Absorption spectroscopy business.industry Metamaterial 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Atomic and Molecular Physics and Optics Electromagnetic interference 010309 optics Optics 0103 physical sciences Electromagnetic shielding Metamaterial absorber Equivalent circuit 0210 nano-technology business Microwave |
Zdroj: | Optics express. 28(18) |
ISSN: | 1094-4087 |
Popis: | 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. |
Databáze: | OpenAIRE |
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