General plasmonic systems to realize plasmonically induced transparency (PIT) effect only exist one single PIT mainly because they only allow one single coupling pathway. In this study, we propose a distinct graphene resonator-based system, which is composed of graphene nanoribbons (GNRs) coupled with dielectric grating-loaded graphene layer resonators, to achieve two switchable PIT effects. By designing crossed directions of the resonators, the proposed system exists two different PIT effects characterized by different resonant positions and linewidths. These two PIT effects result from two separate and polarization-selective coupling pathways, allowing us to switch the PIT from one to the other by simply changing the polarization direction. Parametric studies are carried to demonstrate the coupling effects whereas the two-particle model is applied to explain the physical mechanism, finding excellent agreements between the numerical and theoretical results. Our proposal can be used to design switchable PIT-based plasmonic devices, such as tunable dual-band sensors and perfect absorbers.

实现等离激元诱导的透明（PIT）效果的一般等离激元系统仅存在一个单一的PIT，主要是因为它们仅允许一个单一的耦合途径。在这项研究中，我们提出了一个独特的基于石墨烯谐振器的系统，该系统由石墨烯纳米带（GNR）与加载介电光栅的石墨烯层谐振器组成，以实现两个可切换的PIT效果。通过设计谐振器的交叉方向，所提出的系统存在两个不同的PIT效应，其特征是谐振位置和线宽不同。这两个PIT效应是由两个单独的偏振选择耦合路径产生的，这使我们可以通过简单地更改偏振方向将PIT从一个切换到另一个。进行了参数研究以证明耦合效应，而两粒子模型则用于解释物理机理，在数值和理论结果之间找到了极好的一致性。我们的建议可用于设计可切换的基于PIT的等离子体设备，例如可调谐双频传感器和完美的吸收器。