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Materials 2017, 10(2), 210; doi:10.3390/ma10020210

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
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)
View Full-Text   |   Download PDF [2605 KB, uploaded 21 February 2017]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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.

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