Bi Ke, Guo Yunsheng, Liu Xiaoming, Zhao Qian, Xiao Jinghua, Lei Ming, Zhou Ji
State Key Laboratory of Information Photonics and Optical Communications &School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Sci Rep. 2014 Nov 11;4:7001. doi: 10.1038/srep07001.
Electromagnetic materials with tunable permeability and permittivity are highly desirable for wireless communication and radar technology. However, the tunability of electromagnetic parameters is an immense challenge for conventional materials and metamaterials. Here, we demonstrate a magnetically tunable Mie resonance-based dielectric metamaterials. The magnetically tunable property is derived from the coupling of the Mie resonance of dielectric cube and ferromagnetic precession of ferrite cuboid. Both the simulated and experimental results indicate that the effective permeability and permittivity of the metamaterial can be tuned by modifying the applied magnetic field. This mechanism offers a promising means of constructing microwave devices with large tunable ranges and considerable potential for tailoring via a metamaterial route.
具有可调磁导率和介电常数的电磁材料对于无线通信和雷达技术来说是非常理想的。然而，电磁参数的可调性对于传统材料和超材料而言是一个巨大的挑战。在此，我们展示了一种基于磁可调米氏共振的介电超材料。这种磁可调特性源于介电立方体的米氏共振与铁氧体长方体的铁磁进动之间的耦合。模拟和实验结果均表明，通过改变外加磁场可以调节超材料的有效磁导率和介电常数。这种机制为构建具有大可调范围的微波器件提供了一种有前景的方法，并且通过超材料途径进行定制具有相当大的潜力。
