Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics
Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics
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仿生超材料：多频段电磁波适应性和疏水特性
DOI：
10.1002/smll.201902730
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发表时间：
2019-08-12
期刊：
影响因子：
13.3
通讯作者：
Zhang, Weiping
中科院分区：
文献类型：
--
作者：
Huang, Lingxi;Duan, Yuping;Zhang, Weiping
虽然各种受自然材料启发的光子器件已经被开发出来，但目前还没有针对多波段适应性的研究，这不利于材料科学的进步。在此，受蛾眼表面模型的启发，设计并制备了用于从微波到紫外（UV）的多光谱电磁波（EMWs）频率范围内的可调谐器件的最先进的分层超材料（Heterogeneous Metamaterials，HMF）。实验表明，在深亚波长厚度（1 mm）下，该薄膜具有强的微波吸收带宽，吸收率大于90%（反射损耗< -10 dB），几乎覆盖整个X和Ku波段（8.04-17.88 GHz）。红外发射率降低，同时不影响微波吸收，进一步通过微结构对可见光的强散射实现减反射和伪装，并通过在整个近紫外波段将透射率降低至10%以下来防止降解，以及具有疏水能力。通过仿真模型探讨了生物结构中存在拓扑效应的机理。这一发现为利用自然模型克服光子晶体的物理限制指明了一条途径，在新型光子材料方面具有良好的前景。
Although various photonic devices inspired by natural materials have been developed, there is no research focusing on multibands adaptability, which is not conducive to the advancement of materials science. Herein, inspired by the moth eye surface model, state-of-the-art hierarchical metamaterials (MMs) used as tunable devices in multispectral electromagnetic-waves (EMWs) frequency range, from microwave to ultraviolet (UV), are designed and prepared. Experimentally, the robust broad bandwidth of microwave absorption greater than 90% (reflection loss (RL) < -10 dB) covering almost entire X and Ku bands (8.04-17.88 GHz) under a deep sub-wavelength thickness (1 mm) is demonstrated. The infrared emissivity is reduced and does not affect the microwave absorption simultaneously, further realizing anti-reflection and camouflage via the strong visible light scattering by the microstructure, and can prevent degradation by reducing the transmittance to less than 10% over the whole near UV band, as well as having hydrophobic abilities. The mechanism explored via simulation model is that topological effects are found in the bio-structure. This discovery points to a pathway for using natural models to overcome physical limits of MMs and has promising prospect in novel photonic materials.