Wang Hong, Yu Yingying, Zeng Rui, Sun Bo, Yang Wenxing
Opt Express. 2022 Apr 11;30(8):13320-13330. doi: 10.1364/OE.455807.
Toroidal dipole moment has attracted much attention in recent years due to their novel electromagnetic response such as non-reciprocal interactions and unusual low-radiating manifestations. However, most of the previously reported toroidal dipole moment are incapable of real-time control of direction and intensity. In this paper, an actively tunable toroidal metamaterials are proposed to achieve programmable toroidal dipole manipulations with electric control. The intensity and direction of toroidal dipole can be sensitively regulated by electrically controlling the loaded diodes. Our proof-of-concept experiments show that the toroidal dipole could be dynamically switched to the electric and magnetic dipole. Meantime, the direction of toroidal dipole also could be controlled. Experimental and numerical results, in good agreement, demonstrate good performance of the proposed toroidal metamaterials, with potential applications in modulators, sensors, and filters.
近年来，环形偶极矩因其新颖的电磁响应，如非互易相互作用和异常的低辐射表现而备受关注。然而，先前报道的大多数环形偶极矩都无法对方向和强度进行实时控制。本文提出了一种主动可调谐的环形超材料，以实现用电控方式对环形偶极矩进行可编程操控。通过电控制加载的二极管，可以灵敏地调节环形偶极矩的强度和方向。我们的概念验证实验表明，环形偶极矩可以动态切换为电偶极矩和磁偶极矩。同时，环形偶极矩的方向也可以控制。实验和数值结果吻合良好，证明了所提出的环形超材料具有良好的性能，在调制器、传感器和滤波器等方面具有潜在应用。
