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Article

Tunable Broadband Nonlinear Optical Properties of Black Phosphorus Quantum Dots for Femtosecond Laser Pulses

1
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China
2
SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
3
National University of Singapore (Suzhou) Research Institute, Suzhou 215123, China
4
Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
*
Authors to whom correspondence should be addressed.
Academic Editor: Irene D’Amico
Materials 2017, 10(2), 210; https://doi.org/10.3390/ma10020210
Received: 6 January 2017 / Revised: 13 February 2017 / Accepted: 16 February 2017 / Published: 21 February 2017
(This article belongs to the Special Issue Two-Photon Absorption Materials)
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. View Full-Text
Keywords: black phosphorus; quantum dots; nonlinear optics; two-photon absorption; femtosecond laser black phosphorus; quantum dots; nonlinear optics; two-photon absorption; femtosecond laser
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MDPI and ACS Style

Jiang, X.-F.; Zeng, Z.; Li, S.; Guo, Z.; Zhang, H.; Huang, F.; Xu, Q.-H. Tunable Broadband Nonlinear Optical Properties of Black Phosphorus Quantum Dots for Femtosecond Laser Pulses. Materials 2017, 10, 210. https://doi.org/10.3390/ma10020210

AMA Style

Jiang X-F, Zeng Z, Li S, Guo Z, Zhang H, Huang F, Xu Q-H. Tunable Broadband Nonlinear Optical Properties of Black Phosphorus Quantum Dots for Femtosecond Laser Pulses. Materials. 2017; 10(2):210. https://doi.org/10.3390/ma10020210

Chicago/Turabian Style

Jiang, Xiao-Fang; Zeng, Zhikai; Li, Shuang; Guo, Zhinan; Zhang, Han; Huang, Fei; Xu, Qing-Hua. 2017. "Tunable Broadband Nonlinear Optical Properties of Black Phosphorus Quantum Dots for Femtosecond Laser Pulses" Materials 10, no. 2: 210. https://doi.org/10.3390/ma10020210

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