Two-Dimensional CH3NH3PbI3 Perovskite Nanosheets for Ultrafast Pulsed Fiber Lasers

Abstract
Even though the nonlinear optical effects of solution processed organic–inorganic perovskite films have been studied, the nonlinear optical properties in two-dimensional (2D) perovskites, especially their applications for ultrafast photonics, are largely unexplored. In comparison to bulk perovskite films, 2D perovskite nanosheets with small thicknesses of a few unit cells are more suitable for investigating the intrinsic nonlinear optical properties because bulk recombination of photocarriers and the nonlinear scattering are relatively small. In this research, we systematically investigated the nonlinear optical properties of 2D perovskite nanosheets derived from a combined solution process and vapor phase conversion method. It was found that 2D perovskite nanosheets have stronger saturable absorption properties with large modulation depth and very low saturation intensity compared with those of bulk perovskite films. Using an all dry transfer method, we constructed a new type of saturable absorber device based on single piece 2D perovskite nanosheet. Stable soliton state mode-locking was achieved, and ultrafast picosecond pulses were generated at 1064 nm. This work is likely to pave the way for ultrafast photonic and optoelectronic applications based on 2D perovskites.
Funding Information
  • Ministry of Science and Technology of the People's Republic of China (2015CB932700, 2016YFA0201902)
  • China Postdoctoral Science Foundation (2014M551654)
  • Natural Science Foundation of Jiangsu Province (BK20130328)
  • Australian Research Council (DP140101501, FT150100450)
  • National Natural Science Foundation of China (51290273, 91433107)
  • Postdoctoral Science Foundation, Jiangsu Province (1301020A)
  • Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
  • Priority Academic Program Development of Jiangsu Higher Education Institutions
  • Department of Science and Technology of Jiangsu Province (BK20150053)