Reversible phase transition for switchable second harmonic generation in 2D perovskite microwires  

作　　者：Yingjie Zhao Jiahui Zhao Yangwu Guo Jinjin Zhao Jiangang Feng Yue Geng Junchuan Yang Hanfei Gao Meng Yuan Lei Jiang Yuchen Wu 

机构地区：[1]Key Laboratory of Bio-Inspired Materials and Interfacial Science,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing,China [2]School of Future Technology,University of Chinese Academy of Sciences,Beijing,China [3]Ji Hua Laboratory,Foshan,China [4]Department of Chemical and Biomolecular Sciences,National University of Singapore,Singapore,Singapore

出　　处：《SmartMat》2022年第4期657-667,共11页智能材料（英文）

基　　金：National Science and Technology Major Project,Grant/Award Numbers:2017YFA0204504,2018YFA0208502,2018YFA0704803;JiHua Laboratory Science Program,Grant/Award Number:X190251UZ190;Youth Innovation Promotion Association of the Chinese Academy of Sciences,Grant/Award Number:2018034;National Natural Science Foundation of China,Grant/Award Numbers:52173190,21633014,21703268,51922012。

摘　　要：Highly efficient second-harmonic generation(SHG)has facilitated the development of nanophotonics and sustained promising applications,ranging from electro-optical modulation,frequency conversion,and optical frequency combs to pulse characterization.Although controllable SHG switching has been observed in nanophotonics structures and molecule systems,the relatively small SHG switching contrast impedes its application in switchable nonlinear optics.Herein,reversible phase transitions between glassy and crystalline states without material degradation are demonstrated based on solution-processed chiral perovskite microwire arrays.Breaking of lattice inversion symmetry and high crystallinity support efficient SHG in microwire arrays.By synergy of high-performance SHG and reversible phase transitions between glassy and crystalline states,reversible switching of SHG is demonstrated under facile conditions.The high SHG switching performances,together with a small footprint,pave the way toward the integration of switchable nonlinear devices based on microwire arrays.

关 键 词：2D chiral perovskites assembled microwires nonlinear optics phase transition second harmonic generation 

分 类 号：TB34[一般工业技术—材料科学与工程]