期刊
NANO LETTERS
卷 22, 期 6, 页码 2177-2186出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03282
关键词
strong coupling; transition-metal dichalcogenides; exciton; gap plasmon; effective exciton number
类别
资金
- National Key Research and Development Program of China [2021YFA1400700, 2019YFA0308000, 2018YFA0704201]
- National Natural Science Foundation of China [62025507, 11934019, 11721404, 11874419, 11874405, 62022089, 62175254, 12174437]
- Key-Area Research and Development Program of Guangdong Province [2018B030329001]
- Strategic Priority Research Program [XDB28000000, XDB33000000]
- Youth Innovation Promotion Association of CAS of the Chinese Academy of Sciences [2019007]
- Chongqing Outstanding Youth Fund [2021ZX0400005]
Strong exciton-plasmon coupling between MoS2 layers and a bowtie gap mode was achieved using gold-assisted mechanical exfoliation and nondestructive wet transfer techniques, reducing the effective exciton number and paving the way for strong coupling with a small number of excitons in 2D materials at room temperature.
Strong exciton-plasmon interactions between layered two-dimensional (2D) semiconductors and gap plasmons show a great potential to implement cavity quantum electrodynamics under ambient conditions. However, achieving a robust plasmon-exciton coupling with nanocavities is still very challenging, because the layer area is usually small in the conventional approaches. Here, we report on a robust strong exciton-plasmon coupling between the gap mode of a bowtie and the excitons in MoS2 layers with gold-assisted mechanical exfoliation and nondestructive wet transfer techniques for a large-area layer. Due to the ultrasmall mode volume and strong in-plane field, the estimated effective exciton number contributing to the coupling is largely reduced. With a corrected exciton transition dipole moment, the exciton numbers are extracted as being 40 for the case of a single layer and 48 for eight layers. Our work paves the way to realize strong coupling with 2D materials with a small number of excitons at room temperature.
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