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.

在激光腔内有效地设计激光模式振荡是激光物理和应用领域中一个相对更新的关注研究和令人困惑的问题。在此，我们报告了一种电驱动单模微型激光器的实现，它由掺有镓的氧化锌微线 (ZnO:Ga MW) 和铂纳米粒子 (PtNPs, d ~ 130 nm) 覆盖、氧化镁 (MgO) 纳米薄膜组成 ， Pt 纳米薄膜和 p 型 GaN 衬底。激光腔模式可以通过全内反射在六个侧面之间按照回音壁模式（WGM）共振，并且单模激光波长以390.5 nm为中心，线宽约为0.18 nm。腔品质因数Q被评估为约2169。在激光器结构中，Pt和MgO缓冲层的使用可用于设计ZnO：Ga / GaN异质结的能带对准，优化pn结质量并增加电流注入。因此，精心设计的器件结构可以将电子空穴复合区、增益介质和光学微谐振器无缝地结合到 PtNPs@ZnO:Ga 线中。无论增益光谱带宽如何，这种单 MW 微型激光器本质上都是单模的。为了研究单模操作，作为超级吸收体的 PtNP 可以设计 ZnO:Ga MW 的多模激光作用，即使它们的尺寸通常远大于激光波长。