Zhou Kun, Song Jinlin, Lu Lu, Luo Zixue, Cheng Qiang
Opt Express. 2019 Feb 4;27(3):2305-2316. doi: 10.1364/OE.27.002305.
The light absorption of a hybrid novel MoS-based nanostructure is theoretically investigated by using the finite-difference time-domain (FDTD) simulations, and high-efficiency broadband absorption is achieved in the visible wavelength region. The enhancement of localized electromagnetic field owing to that localized surface plasmon resonances (LSPRs) supported by Au nanoparticles (NPs) can be used to enhance the absorption of MoS, and the localized absorption of monolayer MoS are remarkably enhanced up from about 18.3% and 4.6% to about 55.2% and 84.8% at the resonant wavelengths of 467.7 nm and 557.8 nm, respectively. Furthermore, the effects of radii of Au NPs, period of Au NPs array, Au@Si NPs core-shell ratios, period numbers of the distributed Bragg mirror (DBR), and incident angle on the absorption of the proposed nanostructure have been systematically investigated. The similar design idea to enhance the light-MoS interaction can also be applied to other transition-metal dichalcogenides (TMDCs). This work will contribute to the design of TMDCs-based nanophotonic and optoelectronic devices.
通过有限时域差分（FDTD）模拟从理论上研究了一种新型混合钼基纳米结构的光吸收特性，并在可见光波长范围内实现了高效宽带吸收。由于金纳米颗粒（NPs）支持的局域表面等离子体共振（LSPRs），局域电磁场得到增强，可用于增强MoS的吸收，在467.7 nm和557.8 nm的共振波长处，单层MoS的局域吸收分别从约18.3%和4.6%显著增强至约55.2%和84.8%。此外，还系统研究了金纳米颗粒半径、金纳米颗粒阵列周期、金@硅核壳比、分布布拉格反射镜（DBR）周期数以及入射角对所提出纳米结构吸收的影响。增强光与MoS相互作用的类似设计理念也可应用于其他过渡金属二硫属化物（TMDCs）。这项工作将有助于基于TMDCs的纳米光子和光电器件的设计。
