▎ 摘　　要

We present the coupling-induced transparency (CIT) effect by employing the localized surface plasmon mode supported by a periodic array of graphene nanoribbons destructively interfering with the quasiguided mode supported by a single-layer graphene sheet. It is found that the resonance strength and linewidth are strongly dependent on the coupling distance. It is also shown that the degeneracy between the symmetric and antisymmetric quasiguided modes is lifted owing to the oblique incidence, resulting in the double CIT effect with an ultrahigh figure of merit (FOM) (as high as 271), which may provide potential applications in dynamic optical switching and biochemical sensing. (C) 2016 The Japan Society of Applied Physics