Zhang Yaqiang, Dong Hongxing, Mou Nanli, Li Haonan, Yao Xin, Zhang Long
Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Nanoscale. 2021 Apr 30;13(16):7831-7837. doi: 10.1039/d0nr08640a.
A tunable and transparent metamaterial absorber (MMA) with a water-based substrate is presented, with high optical transparency and broadband microwave absorptivity. In the material structure, indium-tin-oxide (ITO) films are included as the resonant pattern and reflective layers, and distilled water is combined with polymethyl methacrylate (PMMA) to produce the dielectric substrate. By effectively designing its structural parameters, the proposed absorber achieves >90% absorptivity, covering an ultrawide frequency range of 5.8-16.2 GHz, while the average optical transmittance is ∼70.18% over a wavelength range of 400-800 nm. Moreover, owing to a specific design feature, the absorber has high polarization insensitivity and wide-incident-angle stability for transverse electric (TE) and transverse magnetic (TM) polarization waves. Furthermore, the absorption properties of the absorber can be further tuned by controlling the thickness of the water substrate. Both numerical simulations and experimental measurements demonstrate the excellent performance of the device, showing its strong potential for use in optical windows within military and medical equipment.
本文提出了一种基于水基衬底的可调谐透明超材料吸波器（MMA），它具有高光学透明度和宽带微波吸收率。在材料结构中，氧化铟锡（ITO）薄膜作为谐振图案和反射层，蒸馏水与聚甲基丙烯酸甲酯（PMMA）结合制成介电衬底。通过有效设计其结构参数，所提出的吸波器实现了大于90%的吸收率，覆盖5.8 - 16.2 GHz的超宽频率范围，同时在400 - 800 nm波长范围内平均光学透过率约为70.18%。此外，由于特定的设计特点，该吸波器对横向电场（TE）和横向磁场（TM）极化波具有高极化不敏感性和宽入射角稳定性。此外，通过控制水基衬底的厚度可以进一步调节吸波器的吸收特性。数值模拟和实验测量都证明了该器件的优异性能，显示出其在军事和医疗设备中的光学窗口应用的强大潜力。
