Abstract
Plasmon induced transparency (PIT) with graphene metamaterials is investigated with the finite-difference time-domain method. Interestingly, the modulation of the PIT transparency window can be achieved by changing not only the gap distance between the two resonators but also the polarization angle of the excitation light. The three-level plasmonic system is employed to clearly explain the formation mechanism of the PIT effect. The analytical results show good consistency with the numerical calculations. Moreover, the PIT resonant wavelength and group delays of incident waves can be dynamically tuned by varying the Fermi energy of the graphene. Our designed graphene nanostructure is promising for the development of compact elements such as tunable sensors, switches and slow-light devices.
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