Ao Xianyu, Xu Xinan, Dong Jinwu, He Sailing
Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China.
National Engineering Research Center for Optical Instruments, Centre for Optical and Electromagnetic Research, JORCEP , Zhejiang University , Hangzhou 310058 , China.
ACS Appl Mater Interfaces. 2018 Oct 17;10(41):34817-34821. doi: 10.1021/acsami.8b12701. Epub 2018 Oct 5.
Monolayers of transition metal dichalcogenides show great promise for optoelectronic devices as atomically thin semiconductors. Although dielectric or metal nanostructures have been extensively studied for tailoring and enhancing emission from monolayers, their applications are limited because of the mode concentrating inside the dielectric or the high optical losses in metals, together with the low quantum yield in monolayers. Here, we demonstrate that a metal-backed dielectric pillar array can suspend monolayers to increase the radiative recombination, and simultaneously, create strongly confined band-edge modes on surface directly accessible to monolayers. We observe unidirectional enhanced emission from WSe monolayers on polymer pillar array.
过渡金属二硫属化物单层作为原子级薄的半导体，在光电器件方面展现出巨大潜力。尽管介电或金属纳米结构已被广泛研究用于调控和增强单层的发光，但由于模式集中在介电体内或金属中的高光损耗，以及单层中的低量子产率，它们的应用受到限制。在此，我们证明金属背衬的介电柱阵列可以悬浮单层以增加辐射复合，同时在单层可直接接触的表面上产生强受限的带边模式。我们观察到在聚合物柱阵列上的WSe单层有单向增强发射。
