基于频率-分辨干涉自相关区分ZnO F-P微腔的二次谐波和多光子荧光  

Distinction Between Second Harmonic Generation and Multi-photon Luminescence in ZnO F-P Microcavity via Frequency-resolved Interferometric Autocorrelation

作　　者：朱海 董君行 王润晨 王立胜 王竞卓 张一帆 ZHU Hai;DONG Junxing;WANG Runchen;WANG Lisheng;WANG Jingzhuo;ZHANG Yifan(State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics,Sun Yat-Sen University,Guangzhou 510275,China)

机构地区：[1]中山大学物理学院,光电材料与技术国家重点实验室,广东广州510275

出　　处：《发光学报》2025年第2期195-202,共8页Chinese Journal of Luminescence

摘　　要：利用微区频率-分辨干涉自相关技术研究了ZnO微米带以及ZnO Fabry-Pérot微腔(F-P微腔)的非线性上转换光学性质。以化学气相沉积(Chemical vapor deposition,CVD)方法制备ZnO微米带,并通过干法转移置于一对分布式Bragg反射镜(Distributed Bragg reflector,DBR)之间构成二维强耦合F-P微腔,采用自搭建的微区光谱系统进行频率-分辨干涉和角分辨光谱测量。实验结果表明,以近红外超快激光泵浦ZnO样品,二次谐波(Second harmonic generation,SHG)和多光子吸收(Multi-photon absorption,MPA)上转换荧光信号将同时存在,并在频谱图上实现通过特性谱线区分SHG和MPA信号;在ZnO微腔中,SHG和MPA信号还将占据不同的发射角度,讨论了微腔强耦合体系下MPA激子极化激元和二次谐波的竞争关系。该工作为通过高阶非线性上转换方法制备微腔激光器提供了参考。The nonlinear up-conversion optical properties of ZnO micro-belt and ZnO Fabry-Pérot(F-P)microcavity were studied by using frequency-resolved interferometric autocorrelation.ZnO micro-belt were prepared by chemical vapor deposition(CVD)method and dry-transferred between a pair of distributed Bragg reflectors(DBR)to form a two-dimensional strongly coupled F-P microcavity.A home-built micro-spectroscopy system was used for interferometric autocorrelation and angle-resolved spectral measurements.The experimental results showed that when pumping ZnO samples with near-infrared ultrafast lasers,both second harmonic generation(SHG)and multi-photon absorption(MPA)upconversion fluorescence signals coexisted.The distinction between SHG and MPA signals could be achieved through different characteristic lines on the frequency spectra.In the case of ZnO F-P microcavity,SHG and MPA signals occupied different emission angles.The competitive relationship between MPA exciton-polaritons and SHG in the strong coupled microcavity system was discussed.Our results provided a reference for the study of microcavity lasers through higher-order nonlinear upconversion methods.

关 键 词：氧化锌 频率-分辨干涉 二次谐波 多光子吸收 强耦合微腔 

分 类 号：O482.31[理学—固体物理]