期刊
NATURE PHOTONICS
卷 15, 期 7, 页码 510-515出版社
NATURE PORTFOLIO
DOI: 10.1038/s41566-021-00801-2
关键词
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资金
- National Natural Science Foundation of China [52025023, 51991342, 52021006, 51722204, 51972041, 51972042, 51672007, 11974023, 12025407, 11934003]
- National Key RAMP
- D Program of China [2016YFA0300903, 2016YFA0300804]
- Beijing Natural Science Foundation [JQ19004]
- Beijing Excellent Talents Training Support [2017000026833ZK11]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB33000000]
- Beijing Municipal Science AMP
- Technology Commission [Z191100007219005]
- Beijing Graphene Innovation Program [Z181100004818003]
- Key-Area Research and Development Program of GuangDong Province [2020B010189001, 2019B010931001, 2018B030327001]
- Science, Technology and Innovation Commission of Shenzhen Municipality [KYTDPT20181011104202253]
- Bureau of Industry and Information Technology of Shenzhen [201901161512]
- Pearl River Talent Recruitment Program of Guangdong Province [2019ZT08C321]
- National Equipment Program of China [ZDYZ2015-1]
- China Postdoctoral Science Foundation [2020M680177]
The study demonstrates that coating a sub-200-nm-thick quantum dot film on two-dimensional materials can significantly enhance their nonlinear optical responses by more than three orders of magnitude. This enhancement is driven by a non-trivial mechanism of multiphoton-excitation resonance energy transfer, where the quantum dots deliver their strongly absorbed multiphoton energy to the adjacent two-dimensional materials.
Colloidal quantum dots are promising photoactive materials that enable plentiful photonic and optoelectronic applications ranging from lasers, displays and photodetectors to solar cells(1-9). However, these applications mainly utilize the linear optical properties of quantum dots, and their great potential in the broad nonlinear optical regime is still waiting for full exploration(10-12). Here, we demonstrate that a simple coating of a sub-200-nm-thick quantum dot film on two-dimensional materials can significantly enhance their nonlinear optical responses (second, third and fourth harmonic generation) by more than three orders of magnitude. Systematic experimental results indicate that this enhancement is driven by a non-trivial mechanism of multiphoton-excitation resonance energy transfer, where the quantum dots directly deliver their strongly absorbed multiphoton energy to the adjacent two-dimensional materials by a remote dipole-dipole coupling. Our findings could expand the applications of quantum dots in many exciting areas beyond linear optics, such as nonlinear optical signal processing, multiphoton imaging and ultracompact nonlinear optical elements.
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