期刊
ACS Nano
卷 10, 期 7, 页码 6923-6932出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b02770
关键词
2D nanomaterials; black phosphorus; nonlinear optics; ultrafast spectroscopy; z-scan; pump-probe; saturable absorption
类别
资金
- Science Foundation Ireland (SFI) [12/IA/1306]
- European Commission [287732]
- NSFC [61522510, 51302285]
- External Cooperation Program of BIC
- CAS [181231KYSB20130007, XDB160307]
- Science Foundation Ireland (SFI) [12/IA/1306] Funding Source: Science Foundation Ireland (SFI)
The recent progress on black phosphorus makes it a promising candidate material for broadband nanophotonic devices, especially operating in the mid-infrared spectral region. Here, the excited carrier dynamics and nonlinear optical response of unoxidized black phosphorus nanosheets and their wavelength dependence were systematically studied from 800 nm to 2.1 mu m. The wavelength-dependent relaxation times of black phosphorus nanosheets are determined to be 360 fs to 1.36 ps with photon energies from 1.55 to 0.61 eV. In a comparative study with graphene, we found that black phosphorus has a faster carrier relaxation in near- and mid-infrared region. With regard to nonlinear optical absorption, the response of black phosphorus significantly increases from near- to mid-infrared, and black phosphorus is also confirmed to be better as saturable absorber to MoS2 in infrared region.
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