Recently, the reporter learned from Shenzhen University that Shenzhen Peacock Innovation Team, led by Zhang Han, a professor of Shenzhen University-Singapore National University Optoelectronics Collaborative Innovation Center, developed the black phosphorus-based fiber mode-locked laser for the first time and obtained the output signal of ultra-short pulse laser . In recent years, while the graphene industry is flourishing, another new type of single-element two-dimensional atomic crystal material, black phosphorus, was discovered. Similar to graphene, black phosphorus has many excellent features, it is called shoulder graphene "dream material." Zhang Han said that the research and application of black phosphorus has just begun, and its nonlinear optical properties have been confirmed by many domestic and foreign units and applied to the production of ultrafast laser. It is foreseeable that in the near future it will become "the second graphene." May of this year, Zhang Han team found that black phosphorus has broadband light absorption characteristics of saturation, the wavelength range can cover the visible to the infrared band. In the field of lasers, devices with saturable absorption characteristics are the key to the formation of ultra-short pulse lasers. The discovery of the characteristic of black phosphorus has offered the possibility for the research and development of the ultra-fast infrared device. The research results published in October 2015 in the international journal "Advanced Functional Materials". Zhang Han said that studies have shown that graphene is a band gap semi-metallic semiconductor materials, with ultra-high electron mobility and broadband light absorption characteristics. However, the band gapless band structure limits the application and development of graphene in the field of optoelectronics. The most prominent feature of black phosphorus is that it possesses a direct bandgap that varies with the number of layers, which exactly solves the problems plaguing graphene. As early as 2014, Zhang Yuanbo team from Fudan University made use of less-layer black phosphorus to realize the application of high-speed FET, which kicked off extensive research on black phosphorus. The use of black phosphorus is not limited to the field of optoelectronics, which also has advantages in the biomedical field. To this end, Zhang Han and Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences researcher Yu Xuefeng, Hong Kong City University professor Zhu Jianhao, successfully developed a new ultra-small black phosphorous quantum dots, and as a photothermal agent used in cancer treatment.