Tunable Broadband Nonlinear Optical Properties of Black Phosphorus Quantum Dots for Femtosecond Laser Pulses.
Tunable Broadband Nonlinear Optical Properties of Black Phosphorus Quantum Dots for Femtosecond Laser Pulses.
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飞秒激光脉冲黑磷量子点的可调谐宽带非线性光学特性
DOI：
10.3390/ma10020210
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发表时间：
2017-02-21
期刊：
影响因子：
--
通讯作者：
Xu QH
中科院分区：
文献类型：
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作者：
Jiang XF;Zeng Z;Li S;Guo Z;Zhang H;Huang F;Xu QH
利用开孔Z扫描技术研究了超小黑磷量子点在500 ~ 1550 nm波段的宽带非线性光学性质。我们的结果表明，在飞秒激发下，BPQD在可见光范围内表现出显着的非线性吸收，但在近红外范围内表现出饱和吸收。在500、700和900 nm处，非线性吸收系数分别为（7.49 ± 0.23）× 10−3、（1.68 ± 0.078）× 10−3和（0.81 ± 0.03）× 10−3 cm/GW。飞秒泵浦探测测量显示，双光子吸收是负责观察到的非线性吸收的BPQD。在1050，1350和1550 nm处观察到的可饱和吸收行为是由于光激发引起的基态漂白。我们的研究结果表明，BPQD具有很大的应用潜力，在可见光范围内的宽带光学限幅器或在近红外范围内的超快激光脉冲的可饱和吸收。这些超小的BPQD作为超快光子器件中的宽带光学元件是潜在有用的。
Broadband nonlinear optical properties from 500 to 1550 nm of ultrasmall black phosphorus quantum dots (BPQDs) have been extensively investigated by using the open-aperture Z-scan technique. Our results show that BPQDs exhibit significant nonlinear absorption in the visible range, but saturable absorption in the near-infrared range under femtosecond excitation. The calculated nonlinear absorption coefficients were found to be (7.49 ± 0.23) × 10−3, (1.68 ± 0.078) × 10−3 and (0.81 ± 0.03) × 10−3 cm/GW for 500, 700 and 900 nm, respectively. Femtosecond pump-probe measurements performed on BPQDs revealed that two-photon absorption is responsible for the observed nonlinear absorption. The saturable absorption behaviors observed at 1050, 1350 and 1550 nm are due to ground-state bleaching induced by photo-excitation. Our results suggest that BPQDs have great potential in applications as broadband optical limiters in the visible range or saturable absorbers in the near-infrared range for ultrafast laser pulses. These ultrasmall BPQDs are potentially useful as broadband optical elements in ultrafast photonics devices.