High‐Performance Transparent Broadband Microwave Absorbers
High‐Performance Transparent Broadband Microwave Absorbers
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DOI：
10.1002/admi.202101714
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发表时间：
2021-12
影响因子：
5.4
通讯作者：
Heyan Wang;Yilei Zhang;Chengang Ji;Cheng Zhang;Zhengang Lu;Yunfei Liu;Zhibo Cao;Jing Yuan;Jiubin Tan;L. Jay Guo
中科院分区：
文献类型：
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作者：
Heyan Wang;Yilei Zhang;Chengang Ji;Cheng Zhang;Zhengang Lu;Yunfei Liu;Zhibo Cao;Jing Yuan;Jiubin Tan;L. Jay Guo
吸收宽频率范围微波的能力对于提高各种电磁干扰屏蔽应用的性能至关重要。然而，实现具有高光学透明度的宽带微波吸收仍然是一个长期存在且未解决的挑战。在这里，通过引入强烈重叠的多腔谐振，提出了一种简单而强大的高效宽带微波吸收方法，该方法由交替的石墨烯/二氧化硅对和银银膜组成的多层结构支撑。提出了在多层结构中实现宽带吸收的设计准则，更重要的是，首次揭示了不同石墨烯层对微波吸收机制的互补作用，提供了新的分析视角。实验表明，所提出的多层结构的吸收效率在32 GHz的测量范围内，在吸收带宽（≥50%）高达100 GHz的谐振峰处接近1（100%）。此外，多层结构表现出范围为85.8%至68.0%的高可见光透射率。提出的一般理论框架和物理见解结合实验演示奠定了基础，设计一种新型的透明宽带微波吸收剂。
The ability to absorb a broad frequency range of microwaves is essential for improving the performance of various electromagnetic interference shielding applications. However, the achievement of broadband microwave absorption with high optical transparency remains a long‐standing and unsolved challenge. Here, a simple and powerful method for high‐efficiency broadband microwave absorption is presented by introducing strongly overlapped multi‐cavity resonances, which is supported by multi‐layer structures comprising of alternating graphene/silica pairs and ultrathin silver films. A design guideline for achieving broadband absorption in multi‐layer structures is proposed and, more importantly, the complementary effect of different graphene layers on the microwave absorption mechanism is revealed for the first time, providing a new analytical perspective. Experiments show that the absorption efficiency of the proposed multi‐layer structures is near unity (≈100%) at resonant peaks with absorption bandwidths (≥50%) up to ≈30 GHz within the measured range of 32 GHz. In addition, the multi‐layer structures exhibit highly visible transmittance ranging from ≈85.8% to 68.0%. The proposed general theoretical framework and physical insights in combination with experimental demonstrations lay the foundation for designing a new type of transparent broadband microwave absorber.