Chen Jin-Hui, Tan Jun, Wu Guang-Xing, Zhang Xue-Jin, Xu Fei, Lu Yan-Qing
1Key Laboratory of Intelligent Optical Sensing and Manipulation (Ministry of Education), College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093 People's Republic of China.
2School of Physics, Nanjing University, Nanjing, 210093 People's Republic of China.
Light Sci Appl. 2019 Jan 16;8:8. doi: 10.1038/s41377-018-0115-9. eCollection 2019.
In recent years, the two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted renewed interest owing to their remarkable physical and chemical properties. Similar to that of graphene, the atomic thickness of TMDCs significantly limits their optoelectronic applications. In this study, we report a hybrid WS-optical-fiber-nanowire (WOFN) structure for broadband enhancement of the light-matter interactions, i.e., light absorption, photoluminescence (PL) and second-harmonic generation (SHG), through evanescent field coupling. The interactions between the anisotropic light field of an optical fiber nanowire (OFN) and the anisotropic second-order susceptibility tensor of WS are systematically studied theoretically and experimentally. In particular, an efficient SHG in the WOFN appears to be 20 times larger than that in the same OFN before the WS integration under the same conditions. Moreover, we show that strain can efficiently manipulate the PL and SHG in the WOFN owing to the large configurability of the silica OFN. Our results demonstrate the potential applications of waveguide-coupled TMDCs structures for tunable high-performance photonic devices.
近年来，二维（2D）过渡金属二硫属化物（TMDCs）因其卓越的物理和化学性质而重新引起了人们的关注。与石墨烯类似，TMDCs的原子厚度显著限制了它们的光电应用。在本研究中，我们报道了一种混合的WS-光纤-纳米线（WOFN）结构，用于通过倏逝场耦合实现光与物质相互作用（即光吸收、光致发光（PL）和二次谐波产生（SHG））的宽带增强。从理论和实验上系统地研究了光纤纳米线（OFN）的各向异性光场与WS的各向异性二阶极化率张量之间的相互作用。特别是，在相同条件下，WOFN中高效的SHG似乎比WS集成前相同OFN中的SHG大20倍。此外，我们表明，由于二氧化硅OFN的高度可配置性，应变可以有效地调控WOFN中的PL和SHG。我们的结果证明了波导耦合TMDCs结构在可调谐高性能光子器件中的潜在应用。
