Tunable plasmon induced transparency in patterned graphene metamaterial with different carrier mobility

Abstract

Abstract Dynamical manipulation of plasmon induced transparency (PIT) is realized in patterned graphene metamaterial through different carrier mobility, which is composed of two strips and a split ring resonator (SRR). Due to the near field coupling between these two bright modes, a prominent transparency window appears in the transmission spectrum. It can be well fitted with coupled Lorentz oscillator model, which furtherly verifies the accuracy and reliability of our results. On and off switch of the PIT transparency window can be regulated through the carrier mobility. Namely, the PIT transparency window becomes more evident with larger carrier mobility. The plasmon induced absorption (PIA) can also be synchronously realized and the absorption rate reaches up to a high value of 0.5. In addition, the group delay gets enhanced with larger mobility. And the delay time achieves 1.57 ps. In case of sensing application, the linear shift of the PIT transparency window can be obtained with different substrate. Thus, our work shadows great prospects in highly tunable optical switching, optical filters, integrated slow light and sensing devices through non-contact regulation.