▎ 摘　　要

A graphene-embedded waveguide???GEW???with improved modulation capability was proposed???whichcan be over2times larger than that of conventional graphene-on-silicon???GOS???waveguide.More importantly???itis found that the improvement of modulation capability mainly results from the enhanced electric field confine???ment around graphene.Based on this finding???we propose a high-efficient method to optimize the modulation ca???pability.By using this method???the optimization work can be reduced by an order of magnitude.Our work maypromote the design of graphene-based electro-optic modulator with high modulation capability