Su Zengping, Wang Yueke, Shi Hangyu
Opt Express. 2020 Apr 13;28(8):11309-11318. doi: 10.1364/OE.390717.
Photonic spin Hall effect (PSHE) of type II hyperbolic metamaterials is achieved due to near filed interference, which provides a way to decide the propagation direction of subwavelength beam. In this paper, we propose graphene-based hyperbolic metamaterials (GHMMs), which is composed of the alternating graphene/SiO multilayer. The numerical results show that when a dipole emitter is placed at the boundary of the GHMMs, the subwavelength beam with λ/40 full-with half maximum can be excited and propagates along the left or right channel, which is dependent on polarization handedness. In addition, we further demonstrate that the unidirectional propagation angle can be dynamically tuned by changing the external electric field bias applied to graphene.
由于近场干涉实现了II型双曲超材料的光子自旋霍尔效应（PSHE），这为确定亚波长光束的传播方向提供了一种方法。在本文中，我们提出了基于石墨烯的双曲超材料（GHMMs），它由交替的石墨烯/SiO多层组成。数值结果表明，当偶极发射器置于GHMMs的边界时，可激发半高宽为λ/40的亚波长光束，并沿左或右通道传播，这取决于偏振手性。此外，我们进一步证明，通过改变施加到石墨烯上的外部电场偏置，可以动态调节单向传播角。
