Tran Manh Cuong, Le Dinh Hai, Pham Van Hai, Do Hoang Tung, Le Dac Tuyen, Dang Hong Luu, Vu Dinh Lam
Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam.
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam.
Sci Rep. 2018 Jun 22;8(1):9523. doi: 10.1038/s41598-018-27920-1.
Metamaterial full-sized absorber structures are numerically and experimentally investigated in GHz region and then examined in THz frequency. By manipulating monitoring the number and the position of the defect elements in conventional unit cells, the optimal integrative absorber structures are generated. The proposed structures provide an ultra-broadband absorbance in the operating frequency. The good agreement between simulation, measurement and theoretical analysis is observed with a 5 GHz-bandwidth corresponding to the absorption of 95%. In particular, we extrapolate the concept to THz region and demonstrate that, the method can be applied to increase the bandwidth of the metamaterial absorber to 5 THz, while maintaining the other characteristics. This structure can be applied to improve the performance of telecommunication systems such as micro-antenna, micro-electromagnetic transmitters and apply to imaging and sensing fields.
对超材料全尺寸吸收器结构在GHz频段进行了数值和实验研究，然后在太赫兹频率下进行了检测。通过操纵监测传统晶胞中缺陷元素的数量和位置，生成了最佳的集成吸收器结构。所提出的结构在工作频率范围内提供了超宽带吸收率。在对应于95%吸收的5GHz带宽下，观察到模拟、测量和理论分析之间具有良好的一致性。特别是，我们将该概念外推到太赫兹区域，并证明该方法可用于将超材料吸收器的带宽增加到5太赫兹，同时保持其他特性。这种结构可应用于改善电信系统的性能，如微天线、微电磁发射器，并应用于成像和传感领域。
