Approaching perfect absorption of monolayer molybdenum disulfide at visible wavelengths using critical coupling
Approaching perfect absorption of monolayer molybdenum disulfide at visible wavelengths using critical coupling
复制标题
使用临界耦合在可见波长处接近单层二硫化钼的完美吸收
DOI：
10.1088/1361-6528/aac8f1
复制
发表时间：
2018-08-17
期刊：
影响因子：
3.5
通讯作者：
Zhong, Qingfang
中科院分区：
文献类型：
--
作者：
Jiang, Xiaoyun;Wang, Tao;Zhong, Qingfang
提出了一种简单的完美吸收结构，通过导模共振的临界耦合机制实现单层二硫化钼（MoS₂）的高效光吸收。数值模拟和理论分析结果表明，在可见光波长下，这种原子级薄层中的光吸收可高达98.3%，是裸单层MoS₂光吸收的12倍以上。此外，通过调节空气孔半径和介电层厚度，可灵活调谐工作波长，这对于提高单层MoS₂吸收效率和选择性具有重要现实意义。利用临界耦合增强光与MoS₂相互作用的新思路，也可应用于其他原子级薄材料。单层MoS₂吸收性能的显著提升和可调节性，为实现基于MoS₂的高性能光电器件应用（如光电探测和光致发光）提供了良好前景。
A simple perfect absorption structure is proposed to achieve the high efficiency light absorption of monolayer molybdenum disulfide (MoS2) by the critical coupling mechanism of guided resonances. The results of numerical simulation and theoretical analysis show that the light absorption in this atomically thin layer can be as high as 98.3% at the visible wavelengths, which is over 12 times more than that of a bare monolayer MoS2. In addition, the operating wavelength can be tuned flexibly by adjusting the radius of the air hole and the thickness of the dielectric layers, which is of great practical significance to improve the efficiency and selectivity of the absorption in monolayer MoS2. The novel idea of using critical coupling to enhance the light-MoS2 interaction can be also adopted in other atomically thin materials. The meaningful improvement and tunability of the absorption in monolayer MoS2 provides a good prospect for the realization of high-performance MoS2-based optoelectronic applications, such as photodetection and photoluminescence.