摘要
提出了一种增强石墨烯光吸收率的布拉格光栅/石墨烯/金属薄膜光学结构。运用传输矩阵和时域有限差分法研究了其光传输特性,发现布拉格光栅与金属薄膜之间形成的塔姆等离激元局域场可有效增强光与石墨烯的相互作用,单层石墨烯的近红外光吸收率约增大了36倍。探讨了布拉格光栅的周期、石墨烯位置、入射角度、布拉格光栅层厚度及石墨烯化学势与石墨烯光吸收的关系。研究结果表明,上述物理参数的变化可有效调控石墨烯的光吸收波长及效率。研究结果为高性能石墨烯探测器等新型光电子器件的实现提供了新的途径。
A Bragg grating/graphene/metallic thin film-type optical structure is prepared to enhance light absorption in graphene, and the optical propagation properties of the structure are investigated using the transfer matrix and finite-difference time-domain methods. The light-graphene interaction can be effectively enhanced using strongly confined Tamm plasmon polaritons formed between the Bragg grating and metallic film. Thus, an approximately36-fold increase could be observed in the near-infrared light absorption of the graphene. Additionally, the dependence of graphene absorption on the Bragg grating period number, graphene position, angle of incident light,thickness of the Bragg grating layers, and chemical potential of the graphene is investigated. The results show that the wavelength and efficiency of light absorption in graphene can be controlled by adjusting the aforementioned physical parameters. The results of this study provide a new pathway for realizing high-performance graphene devices, especially photodetectors.
作者
黎志文
陆华
李扬武
焦晗
赵建林
Li Zhiwen;Lu Hua;Li Yangwu;Jiao Han;Zhao Jianlin(Ministry of Education Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology t School of Science,Northwestern Polytechnical University,Xi'an,Shaanxi 7\0072,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2019年第1期477-484,共8页
Acta Optica Sinica
基金
国家重点研发计划(2017YFA0303800)
国家自然科学基金(11634010
61705186
11774290
61377035)
中央高校基本科研项目(3102018zy039
3102018zy050)
陕西省自然科学基础研究计划(2017JQ1023)
陕西省留学人员科技活动择优资助项目(2017007)
关键词
薄膜
光学薄膜
石墨烯
塔姆等离激元
光吸收
thin films
optical thin films
graphene
Tamm plasmon polaritons
light absorption
