Zhao Junming, Sun Liang, Zhu Bo, Feng Yijun
Opt Express. 2015 Feb 23;23(4):4658-65. doi: 10.1364/OE.23.004658.
This paper presents the proposal and practical design of a one-way absorber for selective linearly polarized electromagnetic (EM) wave. The EM wave polarization rotation property has been combined with polarization selective absorption utilizing a composite metamaterial slab. The energy of certain linearly polarized EM wave can be absorbed along one particular incident direction, but will be fully transmitted through the opposite direction. For the cross polarized wave, the direction dependent propagation properties are totally reversed. A prototype designed with a total slab thickness of only one-sixth of the operating wavelength is verified through both full-wave simulation and experimental measurement in the microwave regime. It achieves absorption efficiency over 83% along one direction, while transmission efficiency over 83% along the opposite direction for one particular linearly polarized wave. The proposed one-way absorber can be applied in EM devices achieving asymmetric transmission for linearly polarized wave or polarization control. The composite metamaterial that combines different functionalities into one design may provide more potential in metamaterial designs for various applications.
本文提出了一种用于选择性线性极化电磁波的单向吸收器的方案及实际设计。利用复合超材料平板将电磁波极化旋转特性与极化选择性吸收相结合。特定线性极化电磁波的能量可沿一个特定入射方向被吸收，但沿相反方向则会完全透射。对于交叉极化波，与方向相关的传播特性则完全相反。通过全波模拟和微波频段的实验测量，验证了一种总平板厚度仅为工作波长六分之一的原型。对于某一特定线性极化波，它在一个方向上实现了超过83%的吸收效率，而在相反方向上实现了超过83%的透射效率。所提出的单向吸收器可应用于实现线性极化波不对称传输或极化控制的电磁设备中。将不同功能组合到一个设计中的复合超材料可能在各种应用的超材料设计中提供更多潜力。
