Abstract

The nonlinear properties of black phosphorus (BP) nanoplatelets (NPs) have been characterized with Z-scan measurements under 800-nm femtosecond pulsed laser excitation. A transition from saturable absorption (SA) to reverse saturable absorption (RSA) with the increase of laser intensity was observed in the open-aperture (OA) measurements. Simultaneously, closed-aperture (CA) measurements were carried out to investigate the nonlinear refractive index of BP NPs together, and a value of $n_2\simeq (6.8\pm 0.2)\times {10}^{-13}{\mathrm{m}}^2/\mathrm{W}$ was obtained. The nonlinear absorption properties were analyzed according to the band structure of BP. A theoretical analysis based on SA and two-photon absorption (TPA) was used to determine the nonlinear absorption coefficients from the experimental results, and the TPA coefficient at 800 nm was estimated about $(4.5\pm 0.2)\times {10}^{-10}\mathrm{m}/\mathrm{W}$.

© 2015 Optical Society of America

Z-scan measurement of nonlinear optical properties of BiOCl nanosheets

Runze Chen, Xin Zheng, Yangwei Zhang, Yuhua Tang, and Tian Jiang
Appl. Opt. 54(21) 6592-6597 (2015)

Thulium/holmium-doped fiber laser passively mode locked by black phosphorus nanoplatelets-based saturable absorber

Hao Yu, Xin Zheng, Ke Yin, Xiang’ai Cheng, and Tian Jiang
Appl. Opt. 54(34) 10290-10294 (2015)

Giant nonlinear absorption and excited carrier dynamics of black phosphorus few-layer nanosheets in broadband spectra

Runze Chen, Yuhua Tang, Xin Zheng, and Tian Jiang
Appl. Opt. 55(36) 10307-10312 (2016)

Broadband nonlinear optical response in multi-layer black phosphorus: an emerging infrared and mid-infrared optical material

S. B. Lu, L. L. Miao, Z. N. Guo, X. Qi, C. J. Zhao, H. Zhang, S. C. Wen, D. Y. Tang, and D. Y. Fan
Opt. Express 23(9) 11183-11194 (2015)

Z-scan measurement of the nonlinear refractive index of monolayer WS₂

Xin Zheng, Yangwei Zhang, Runze Chen, Xiang’ai Cheng, Zhongjie Xu, and Tian Jiang
Opt. Express 23(12) 15616-15623 (2015)