Abstract
We propose an electrically controllable single-photon switch that consists of a graphene nanoribbon side-coupled to a dynamically modulated graphene nanodisk. With a harmonic modulation of graphene conductivity induced by the gate voltage, interband photonic transition between two eigenstates of the nanodisk is introduced, which leads to extraordinary single-photon transport properties such as electromagnetically induced transparency-like phenomena. This effect is utilized to realize a highly efficient single-photon switch. With properly designed parameters, numerical results show that an extinction ratio of up to 20.8dB can be achieved. The influence of the coupling strength between nanoribbon and nanodisk, the coupling strength between two eigenstates of the nanodisk, and dissipations in the nanodisk are also investigated in this paper.
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