Shen Qian, Hong Lujun, Deng Xiaohua, Shen Linfang
Institute of Space Science and Technology, Nanchang University, Nanchang, 330031, China.
Department of Information Engineering, Nanchang University, Nanchang, 330031, China.
Sci Rep. 2018 Oct 25;8(1):15811. doi: 10.1038/s41598-018-33956-0.
A microwave one-way waveguide of three-dimensional configuration is proposed and investigated theoretically. In this waveguide there exists a complete one-way propagation band, where the mode propagates only in one direction and can be immune to backscattering. By terminating the one-way waveguide with metal slab, one-way propagating waves in this waveguide system can be stopped at the terminal end without any backscattering. Meanwhile, a hotspot with extremely enhanced magnetic-field amplitude is generated in this 3D waveguide system. For an incident microwave pulse, the trapped wave packet can be compressed to deep subwavelength scale besides the magnetic field enhancement. Moreover, the magnetic field enhancement of trapped waves can be further largely increased by tapering laterally the waveguide system. The approach for trapping microwaves has promising applications in magnetic sensing and magnetic non-linearity.
提出并从理论上研究了一种三维结构的微波单向波导。在这种波导中存在一个完整的单向传播带，其中模式仅在一个方向传播且可免受反向散射影响。通过用金属板终止单向波导，该波导系统中的单向传播波可在终端停止而无任何反向散射。同时，在这个三维波导系统中会产生一个磁场幅度极大增强的热点。对于入射微波脉冲，除了磁场增强外，捕获的波包可被压缩到深亚波长尺度。此外，通过横向逐渐变细波导系统，捕获波的磁场增强可进一步大幅增加。捕获微波的方法在磁传感和磁非线性方面具有广阔的应用前景。
