Enhancement of Near-Infrared Light Graphene Interaction by Nanobeam Resonator

We propose that strong enhancement of light graphene interaction at telecommunication wavelengths can be obtained by combining graphene with one-dimensional photonic crystal nanobeam resonator. The enhancement mechanism originates from the combined effect of Fabry-Perot-like resonance and the low group velocity of the guided Floquet-Bloch mode at the frequencies near the band edge. Simulation results show the absorption of undoped graphene with a length of 6.5 μm is as high as 50%. When the Fermi energy level of graphene is raised from 0 to 0.8 eV, the transmission has a modulation depth of 7 dB. As a novel alternative, the structure we proposed may provide potential applications in the on-chip integrated photodetectors, optical modulators, and nonlinear optics.