题目：

Ultrafast Recovery Time and Broadband Saturable Absorption Properties of Black Phosphorus Suspension

作者：

Yingwei Wang,¹ Guanghui Huang,¹ Haoran Mu,² Shenghuang Lin,^2,3 Jiazhang Chen,¹ Si Xiao,^1,a Qiaoliang Bao,² and Jun He^1,b

单位：

¹Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, People’s Republic of China

²Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People’s Republic of China

³Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China

摘要：

As a new type of two-dimensional crystal material, black phosphorus (BP) exhibits excellent electronics and optical performance. Herein, we focus on carrier relaxation dynamics and nonlinear optical properties of BP suspension. Atomic force microscopy, transmission electron microscopy, and optical transmission spectrum are employed to characterize the structure and linear optical properties of the BP. Additionally, pump-probe experiments at wavelength of 1550 nm were carried out to study the carrier dynamics in BP suspension, and ultrafast recovery time was observed (τ_s=24±2fs). Furthermore, we demonstrate the saturable absorption signals by open aperture Z-scan experiments at wavelengths of 1550 nm, 532 nm, and 680 nm. The results indicate that BP has broadband saturable absorption properties and the nonlinear absorption coefficients were determined to be β₂=-0.20-0.08*10³ cm/GW (532 nm), β₂=-0.12-0.05*10³cm/GW (680 nm), and β₂=0.15 -0.09*10³ cm/GW(1550 nm).

影响因子：

3.302

分区情况：

2区

链接：

http://dx.doi.org/10.1063/1.4930077