| Autor: |
Ma S; School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, China., Wei H; School of Physics, Sun Yat-Sen University, Guangzhou 510275, China., Zhu H; School of Physics, Sun Yat-Sen University, Guangzhou 510275, China., Ling FC; Department of Physics, The University of Hong Kong, Hong Kong 999077, China., Wang X; School of Materials, Shanghai Dianji University, Shanghai 200245, China., Su S; School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, China.; Guangdong Engineering Research Center of Optoelectronic Functional Materials and Devices, Guangzhou 510631, China. |
| Abstrakt: |
In the progress of nonlinear optics, multiphoton absorption (MPA) upconversion lasing enables many vital applications in bioimaging, three-dimensional optical data storage, and photodynamic therapy. Here, efficient four-photon absorption upconversion lasing from the ZnO/ZnMgO multiple quantum wells (MQWs) at room temperature is realized. Moreover, the MPA upconversion lasing and third-harmonic generation peak generated in the MQWs under the excitation of a femtosecond (fs) laser pulse were observed concurrently, and the essential differences between each other were studied comprehensively. Compared with the ZnO film, the upconversion lasing peak of the ZnO/ZnMgO MQWs exhibits a clear blue shift. In addition, the four-photon absorption upconversion photoluminescence (PL) intensity was enhanced in the MQWs/Au nanoparticles (NPs) by the metal-localized surface plasmons (LSPs). The work paves the way for short-wavelength lasers by taking advantage of the high stability and large exciton binding energy of the MQWs' structures. |
