为了提高石墨烯的光吸收效率,提出了一种含有石墨烯缺陷的一维光子晶体模型。 基于传输矩阵法(TMM)对其在500～1000 nm范围内的吸收特性进行了理论计算和数值模拟,重点分析了 其吸收特性与缺陷层后光子晶体的周期数、石墨烯层数、入射角度及匹配层厚度之间的关系。结果表 明一维光子晶体引入石墨烯缺陷后形成了微腔结构,导致光的局域化,可将石墨烯对可见-近红外光 波的吸收提高至100%;可通过改变光子晶体参数、缺陷层厚度来调控石墨烯的可见-近红外吸收;吸 收峰随缺陷层厚度的增加出现了红移。

In order to enhance light absorption efficiency of graphene, a one-dimensional photonic crystal with graphene-based defect is proposed. Absorption characteristics of the structure are theoretically calculated and numerically simulated in the range from 500 nm to 1000 nm based on transfer matrix method (TMM). Dependence of absorption characteristics on period number of photonic crystal behind the defect layer, number of graphene layers, incident angle and thickness of matching layers is analyzed. Results show that the micro-cavity structure is formed after introducing graphene defects in one-dimensional photonic crystal, which causes the localization of light, and absorption of graphene is significantly improved to 100% from the visible to near-infrared bands. The visible and near-infrared absorption of graphene can be controlled by changing parameters of photonic crystal and thickness of defect layers. The absorption peak appears red-shift with the increasing of defect layer thickness.