期刊
2D MATERIALS
卷 3, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/3/2/025017
关键词
absorbtion enhancement; MoS2 monolayers; nanocavities; photoluminescence
资金
- National Science Foundation [EFRI 1433311, ECCS-1425648, ECCS-1445934, ECCS-1507312]
- ALNOS-MURI project [ARO-W911NF-11-1-0362]
- US Air Force Office of Scientific Research MURI grant [FA9550-12-1-0471]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1445934] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1507312] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1433311] Funding Source: National Science Foundation
Two-dimensional (2D) atomic crystals and van der Waals heterostructures constitute an emerging platform for developing new functional ultra-thin electronic and optoelectronic materials for novel energy-efficient devices. However, in most thin-film optical applications, there is a long-existing trade-offbetween the effectiveness of light matter interactions and the thickness of semiconductor materials, especially when the materials are scaled down to atom thick dimensions. Consequently, enhancement strategies can introduce significant advances to these atomically thick materials and devices. Here we demonstrate enhanced absorption and photoluminescence generation from MoS2 monolayers coupled with a planar nanocavity. This nanocavity consists of an alumina nanolayer spacer sandwiched between monolayer MoS2 and an aluminum reflector, and can strongly enhance the light matter interaction within the MoS2, increasing the exclusive absorption of monolayer MoS2 to nearly 70% at a wavelength of 450 nm. The nanocavity also modifies the spontaneous emission rate, providing an additional design freedom to control the interaction between light and 2D materials.
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