期刊
ACS NANO
卷 10, 期 8, 页码 7493-7499出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b02195
关键词
MoS2; two-dimensional materials; light absorption; leaky mode; resonant photonics
类别
资金
- Army Research Office [W911NF-13-1-0201]
- CAREER award from the National Science Foundation [DMR- 1352028]
- National Science Foundation [DMR-1312582, ECCS-1508854]
- State of North Carolina
- National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1352028] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1312582] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1508854] Funding Source: National Science Foundation
We present a combined theoretical and experimental effort to enable strong light absorption (>70%) in atomically thin MoS2 films (<= 4 layers) for either narrowband incidence with arbitrarily prespecified wavelengths or broadband incidence like solar radiation. This is achieved by integrating the films with resonant photonic structures that are deterministically designed using a unique reverse design approach based on leaky mode coupling. The design starts with identifying the properties of leaky modes necessary for the targeted strong absorption, followed by searching for the geometrical features of nanostructures to support the desired modes. This process is very intuitive and only involves a minimal amount of computation, thanks to the straightforward correlations between optical functionality and leaky modes as well as between leaky modes and the geometrical feature of nanostructures. The result may provide useful guidance for the development of high-performance atomic-scale photonic devices, such as solar cells, modulators, photodetectors, and photocatalysts.
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