Wei Dawei, Hu Fangrong, Jiang Mingzhu, An Su, Gao Zhongpeng, Luo Weiyu, Zhang Longhui, Lin Shangjun
College of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China.
School of Mathematics and Physics, Hechi University, Hechi 546300, China.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54731-54741. doi: 10.1021/acsami.4c13957. Epub 2024 Sep 25.
Terahertz absorbers play a crucial role in terahertz detectors, radar stealth, electromagnetic shielding, and other fields. However, the design and fabrication of flexible terahertz broadband absorbers remain a challenge at present. Here, we demonstrated a terahertz broadband absorber based on a copper composite film (CCF) consisting of a copper foam and an organic silica gel doped with FeO powder. The CCF can be fabricated by the infiltration method. The influence of the thickness and the pore size of the copper foam and the mass fraction of doped FeO powder on the absorption bandwidth were investigated. When the thickness of the CCF is 1.5 mm, the pore size of the copper foam is 95 pores per inch (ppi), and the mass fraction of FeO is 1%; a broadband absorption is achieved in the range of 0.11-3.5 THz. It is noted that the mass fraction of FeO has a significant impact on the absorption bandwidth. In addition, the thickness of the CCF and the pore size of the copper foam also have an impact on the absorption. The impedance matching theory is introduced to understand the mechanism of broadband absorption. This flexible broadband absorber has potential application in terahertz stealth, shielding, and the sixth-generation (6G) broadband wireless communication in the future.
太赫兹吸收体在太赫兹探测器、雷达隐身、电磁屏蔽等领域发挥着关键作用。然而，目前柔性太赫兹宽带吸收体的设计与制造仍然是一项挑战。在此，我们展示了一种基于由泡沫铜和掺杂有FeO粉末的有机硅胶组成的铜复合薄膜（CCF）的太赫兹宽带吸收体。CCF可通过浸渍法制造。研究了泡沫铜的厚度和孔径以及掺杂FeO粉末的质量分数对吸收带宽的影响。当CCF的厚度为1.5毫米、泡沫铜的孔径为每英寸95孔（ppi）且FeO的质量分数为1%时，在0.11 - 3.5太赫兹范围内实现了宽带吸收。值得注意的是，FeO的质量分数对吸收带宽有显著影响。此外，CCF的厚度和泡沫铜的孔径也对吸收有影响。引入阻抗匹配理论来理解宽带吸收的机制。这种柔性宽带吸收体在未来太赫兹隐身、屏蔽以及第六代（6G）宽带无线通信中具有潜在应用。
