Perovskite CsPbX3: A Promising Nonlinear Optical Material and Its Applications for Ambient All‐Optical Switching with Enhanced Stability

• DOI: 10.1002/adom.201800400
• Publication Date: 2018-07-02T05:14:04Z
• Authors: Leiming Wu; Keqiang Chen; Weichun Huang; Zhitao Lin; Jinlai Zhao; Xiantao Jiang; Yanqi Ge; Feng Zhang; Quannan Xiao; Zhinan Guo; Yuanjiang Xiang; Jianqing Li; Qiaoliang Bao; Han Zhang
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

AbstractPerovskites are demonstrated as an excellent prospect for applications in all‐optical switching due to their excellent nonlinear optical effects. In this contribution, 2D cesium lead iodine (CsPbI3) quantum dots (QDs) and cesium lead bromine iodine (CsPbBrxI3−x) nanosheets (NSs) are prepared, characterized, and applied in all‐optical switching, and their asymmetric nonlinear optical response is also investigated. Moreover, the impact of the beam distortion on the CsPbI3 QDs and CsPbBrxI3−x NSs is systematically analyzed. An all‐optical switching technique based on perovskite QDs and NSs is experimentally investigated, which is realized by modulating the propagation of the signal beam with another controlling beam using spatial cross‐phase modulation. The achievement of all‐optical switching indicates that perovskites can be developed as an excellent optical material for all‐optical signal processing. The contribution reveals the potential applications of perovskites as a new type of optical information material, and it is therefore anticipated that CsPbI3 QDs, CsPbBrxI3−x NSs, and other 2D perovskite NSs could find promising applications in photonics devices (such as optical modulators, optical switchers, and detectors).