调制能力提升的嵌入式石墨烯波导结构

Graphene-embedded waveguide with improved modulation capability

提出了一种调制能力提升的嵌入式石墨烯波导结构(GEW)。相对于传统的石墨烯覆盖硅表面波导结构(GOS),其调制能力可以提升2倍以上。更重要的是发现电场在GEW中可以被更好地束缚在石墨烯上,这正是GEW的调制能力获得显著提升的主要原因。基于上述发现,进一步提出了一种高效的调制能力优化方法。通过采用该方法,优化工作的计算量可以减少1个数量级。综上所述,本文的工作可能对将来研究者设计拥有高调制能力的石墨烯电光调制器提供一定帮助。

A graphene-embedded waveguide(GEW)with improved modulation capability was proposed,which can be over 2 times larger than that of conventional graphene-on-silicon(GOS)waveguide. More importantly,it is found that the improvement of modulation capability mainly results from the enhanced electric field confinement around graphene. Based on this finding,we propose a high-efficient method to optimize the modulation capability. By using this method,the optimization work can be reduced by an order of magnitude. Our work may promote the design of graphene-based electro-optic modulator with high modulation capability.