Abstract
We propose that the strong modulation of a light wave at telecommunication wavelengths can be obtained by a combing graphene/Al2O3 multilayer stack (GAMS) with a one-dimensional electro-optic (EO) modulator based on a photonic crystal nanobeam (PCN). The amplitude of the light-graphene (LG) interaction in GAMS is enhanced significantly compared with it in monolayer graphene, thus through tuning the chemical potential of graphene via gate voltage, both the resonant wavelength as well as the absorption peak can be significantly adjusted. Simulation results show that the modulation depth of resonance is about 11.25nm/eV. Furthermore, we also design a two-defect-cavity EO modulator based on a pair of GAMSs, which reveals two tunable resonant wavelengths when different gate voltage is applied on each GAMS. As a novel alternative, our proposed device may provide potential applications in high-density integrated optical devices, photolectric transducers, and laser pulse limiters.
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