Author Affiliations
Abstract
MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Key Laboratory of Light-Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
We present the perfect light absorption of monolayer molybdenum disulfide () in a dielectric multilayer system with two different Bragg mirrors. The results show that the strong absorption of visible light in monolayer is attributed to the formation of optical Tamm states (OTSs) between two Bragg mirrors. The absorption spectrum is dependent on the layer thickness of Bragg mirrors, incident angle of light, and the period numbers of Bragg mirrors. Especially, the nearly perfect light absorption (99.4%) of monolayer can be achieved by choosing proper period numbers, which is well analyzed by the temporal coupled-mode theory.
optical Tamm states molybdenum disulfide light absorption Chinese Optics Letters
2021, 19(10): 103801
西北工业大学理学院超常条件材料物理与化学教育部重点实验室与陕西省光信息技术重点实验室, 陕西 西安 710072
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。
薄膜 光学薄膜 石墨烯 塔姆等离激元 光吸收
