基于非对称谐振腔增强石墨烯紫外光吸收  

Ultraviolet Absorption of Graphene Enhanced by Asymmetric Resonant Cavity

作　　者：罗国平 陈星源 胡素梅 朱伟玲 Luo Guoping;Chen Xingyuan;Hu Sumei;Zhu Weiling(School of Science,Guangdong University of Petrochemical Technology,Maoming,Guangdong 525000,China)

机构地区：[1]广东石油化工学院理学院,广东茂名525000

出　　处：《光学学报》2021年第15期252-259,共8页Acta Optica Sinica

基　　金：国家自然科学基金(12074441);广东省自然科学基金(2018A030307028,2019A1515010916);广东省教育厅青年创新人才项目(2017KQNCX136);广东石油化工学院科研基金(2017rc20)。

摘　　要：基于布拉格光栅/金属薄膜非对称谐振腔设计一种增强石墨烯紫外光吸收的多层薄膜结构。采用传输矩阵法模拟计算多层薄膜结构参数与石墨烯吸收光谱的关联规律,得到最佳结构参数。计算结果表明,非对称谐振腔共振效应有效促进入射光与石墨烯的相互作用。优化后石墨烯在275 nm波长处的紫外光吸收率高达0.9534,半峰全宽仅为2.0 nm。进一步研究表明布拉格光栅的中心波长和光入射角可以调制石墨烯的吸收峰值波长和峰值大小,增加石墨烯层数能够同时提升紫外光吸收率和扩展吸收光谱。该结构也可以增强其他宽禁带二维材料的紫外吸收性能。Based on the Bragg grating/metallic film asymmetric resonant cavity, a multi-layer film structure that enhances the ultraviolet absorption of graphene is designed. The transfer matrix method is used to simulate and calculate the correlation between the film structure parameters and the absorption spectra of graphene. As a result, the optimal structure parameters are obtained. The calculation results show that the resonance effect of the asymmetric resonant cavity strongly promotes the interaction between incident light and graphene. After optimization, the ultraviolet absorption of graphene at 275 nm is up to 0.9534 and the full width at half maximum is only 2.0 nm. Further research indicates that the central wavelength of the Bragg grating and the incident angle of light can regulate the wavelength and size of the graphene absorption peak. Increasing the number of graphene layers is able to enhance the ultraviolet absorption of graphene and expand absorption spectra. The proposed structure can also promote the ultraviolet absorption of other wide-band-gap two-dimensional materials.

关 键 词：薄膜 光吸收 布拉格反射器 等离激元 石墨烯 

分 类 号：O436.2[机械工程—光学工程]