Abstract
Wavelength-tunable plasmon-induced transparency (PIT) in coupled graphene gratings was theoretically investigated in mid-infrared region. Both direct and phase-coupled PITs were considered in the proposed structure. In both schemes, a proper wavelength detuning between two graphene gratings was required for PIT observations. The effect of graphene quality on the PIT was also investigated. Graphene quality of μ = 50,000 cm2/Vs was sufficient for achieving a distinct PIT peak while a weak PIT was observed for μ = 10,000 cm2/Vs. PIT peak amplitude modulation and tunability of operating wavelength were demonstrated by adjusting the Fermi level of graphene. Compared with previously studied graphene-based PITs, the proposed PIT based on the coupled graphene gratings is much easier to design and fabricate.
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