期刊
NANOSCALE
卷 8, 期 39, 页码 17374-17382出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr06076e
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资金
- NSFC [61308034, 61522510, 61675217, 51302285]
- External Cooperation Program of BIC, CAS [181231KYSB20130007]
- Key Research Program of Frontier Science of CAS [QYZDB-SSW-JSC041]
- Strategic Priority Research Program of CAS [XDB160307]
- European Research Council (SEMANTICS)
- SFI [11/PI/1087, SFI/12/RC/2278]
- EU Graphene Flagship [604391]
According to the excited-state decay time, a slow saturable absorber model was employed to obtain the ground-state absorption and excited-state absorption cross sections sigma(gs) and sigma(es) of black phosphorus (BP) nanosheets, which are (1.25 +/- 0.07) x 10(-16) cm(2) and (2.97 +/- 0.21) x 10(-17) cm(2) at 515 nm, and (5.95 +/- 0.17) x 10(-18) cm(2) and (5.19 +/- 0.71) x 10(-19) cm(2) at 1030 nm, respectively. In comparison, the sigma(gs) and sigma(es) of MoS2 and graphene were also obtained with the same model. The ratio sigma(es)/sigma(gs) of BP is the smallest (only 0.24 +/- 0.03 at 515 nm and 0.09 +/- 0.01 at 1030 nm) among the three two-dimensional layered materials both at 515 nm and 1030 nm. Relatively large ground-state transition probability and weak loss of excited-state absorption result in good saturable absorption performance. In comparison with MoS2 and graphene, the much lower saturation intensity of BP can be well explained from this perspective.
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