单层与双层石墨烯的光学吸收性质研究*

陈英良; 冯小波; 侯德东

doi:10.7498/aps.62.187301

单层与双层石墨烯的光学吸收性质研究*

云南师范大学物理与电子信息学院,昆明,650500

Optical absorptions in monolayer and bilayer graphene

摘要: 采用紧束缚模型分别描述单层、双层石墨烯的能带结构,利用光子-电子相互作用的二阶微扰理论分别计算单光子和双光子吸收系数.计算结果表明：单层石墨烯单光子吸收系数为常数,约为6.8×107 m?1,即单层石墨烯对入射光的吸收率约为2.3%；双层石墨烯的单光子吸收比单层石墨烯的单光子吸收强,且随入射光波长呈分段性变化.单层石墨烯的双光子吸收系数与波长λ4成正比；双层石墨烯双光子吸收系数在红外波段(～3100 nm处)有一个很强的共振吸收峰.研究结果可为石墨烯材料在光电子器件的研究和制作方面提供指导.

关键词:

Abstract: We theoretically simulate one-photon and two-photon absorption spectra for monolayer and bilayer graphene employing the second-order perturbation theory of the electron-photon interaction. The tight-binding model is used to describe the band structure of graphene. The results show that one-photon absorption coefficient of monolayer graphene is a constant about 6.8 × 107 m?1, demon-strating that the absorptivity of incident light in monolayer graphene approximates to 2.3%. The one-photon absorption coefficient of bilayer graphene changes sectionally with the wavelength and is greater than that of monolayer graphene. The two-photon absorption coefficient of monolayer graphene is proportional toλ4 . The two-photon absorption coefficient of bilayer graphene exhibits a giant resonance absorption peak in the infrared (～3100 nm) region. Our results will provide theoretical guidance for the application of graphene in the research field of optoelectronic devices.

单层与双层石墨烯的光学吸收性质研究*

云南师范大学物理与电子信息学院,昆明,650500

关键词:

Optical absorptions in monolayer and bilayer graphene

云南师范大学物理与电子信息学院,昆明,650500

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