Perfect absorption for monolayer transition-metal dichalcogenides by critical coupling

Perfect absorption for monolayer transition-metal dichalcogenides by critical coupling
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通过临界耦合实现单层过渡金属二硫属化物的完美吸收

DOI:
10.1088/1361-6528/abaa10
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发表时间:
2020-07
期刊:
影响因子:
3.5
通讯作者:
Shi Dong
Shi Dong
中科院分区:
材料科学3区
文献类型:
--
作者:
Wang Jie;Yang Jinzhe;Shi Dong

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由于固有的原子尺寸,过渡金属二硫族化合物(TMDCs)与自由空间光的耦合较弱,并且具有较差的光吸收,这限制了一些实际应用。探索一种有效的方法来促进它们的吸收是非常重要和迫切需要的。在这项工作中,基于时间耦合模式理论,提出了接近吸收体100%吸收的一般指南。从理论上和数值上证明了结合介电光子结构的TMDCs的完美吸收。通过调整结构参数,该结构在感兴趣的波长处具有良好的可调性。此外,还研究了这种结构在不同极化情况下光吸收的角依赖性。目前提高光吸收的工作将特别有利于应用于先进的光电探测器和调制器。
Due to the inherent atomical size, transition-metal dichalcogenides (TMDCs) have a weak coupling with free-space light and exhibit poor optical absorption, which restricts some practical applications. Exploring an effective way to boost their absorption is important and highly desired. In this work, based on the temporal coupled-mode theory, a generic guide to approach 100% absorption of an absorber is presented. From such a theory, the perfect absorption of TMDCs integrated with dielectric photonic structure is both theoretically and numerically demonstrated. This proposed structure has advantageous tunability at the wavelengths of interest by adjusting structure parameters. Moreover, the angular dependence of the light absorption of such a structure for different polarizations is also investigated. The present work of boosting light absorption would be particularly favorable for applications in advanced photodetectors and modulators.
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