饱和(图论)
黑磷
磷
吸收(声学)
材料科学
环境科学
化学物理
化学
光电子学
复合材料
冶金
数学
组合数学
作者
Saifeng Zhang,Yuanxin Li,Xiaoyan Zhang,Ningning Dong,Kangpeng Wang,Damien Hanlon,Jonathan N. Coleman,Long Zhang,Jun Wang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2016-01-01
卷期号:8 (39): 17374-17382
被引量:46
摘要
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 σgs and σes of black phosphorus (BP) nanosheets, which are (1.25 ± 0.07) × 10−16 cm2 and (2.97 ± 0.21) × 10−17 cm2 at 515 nm, and (5.95 ± 0.17) × 10−18 cm2 and (5.19 ± 0.71) × 10−19 cm2 at 1030 nm, respectively. In comparison, the σgs and σes of MoS2 and graphene were also obtained with the same model. The ratio σes/σgs 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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