Electrically driven single microwire-based single-mode microlaser  

作　　者：Xiangbo Zhou Mingming Jiang Kai Xu Maosheng Liu Shulin Sha Shuiyan Cao Caixia Kan Da Ning Shi 

机构地区：[1]College of Physics,MIIT Key Laboratory of Aerospace Information Materials and Physics,Key Laboratory for Intelligent Nano Materials and Devices,Nanjing University of Aeronautics and Astronautics,No.29 Jiangjun Road,Nanjing,211106,China

出　　处：《Light(Science & Applications)》2022年第8期1799-1810,共12页光（科学与应用)（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.11974182 and 11874220);the Fundamental Research Funds for the Central Universities(NO.NC2022008).

摘　　要：Engineering the lasing-mode oscillations effectively within a laser cavity is a relatively updated attentive study and perplexing issue in the field of laser physics and applications. Herein, we report a realization of electrically driven single-mode microlaser, which is composed of gallium incorporated zinc oxide microwire (ZnO:Ga MW) with platinum nanoparticles (PtNPs, d ~ 130 nm) covering, a magnesium oxide (MgO) nanofilm, a Pt nanofilm, and a p-type GaN substrate. The laser cavity modes could resonate following the whispering-gallery mode (WGM) among the six side surfaces by total internal reflection, and the single-mode lasing wavelength is centered at 390.5 nm with a linewidth of about 0.18 nm. The cavity quality factor Q is evaluated to about 2169. In the laser structure, the usage of Pt and MgO buffer layers can be utilized to engineer the band alignment of ZnO:Ga/GaN heterojunction, optimize the p-n junction quality and increase the current injection. Thus, the well-designed device structure can seamlessly unite the electron-hole recombination region, the gain medium, and optical microresonator into the PtNPs@ZnO:Ga wire perfectly. Such a single MW microlaser is essentially single-mode regardless of the gain spectral bandwidth. To study the single-mode operation, PtNPs working as superabsorber can engineering the multimode lasing actions of ZnO:Ga MWs even if their dimensions are typically much larger than that of lasing wavelength. Our findings can provide a straightforward and effective scheme to develop single-mode microlaser devices based on one-dimensional wire semiconductors.

关 键 词：mode LASING CAVITY 

分 类 号：TN248[电子电信—物理电子学]