The ultrasmall dimensions of subwavelength nanowires have made them ideal candidates for compact and energy-efficient photonic applications and have, in particular, led to the realization of a large range of plasmonic nanolasers. Ohmic losses and short propagation lengths in metal-based plasmonic platforms, however, limit their performance. In this work, we bypass such limitations by relying instead on an all-dielectric platform: subwavelength ZnO nanowire-induced cavities integrated in SiN photonic crystal waveguides. Because of the low optical losses of this fully dielectric nanocavity, we demonstrate low-threshold lasing at high-temperatures using subwavelength nanowires as the gain material. Investigated devices consistently outperform their plasmonic counterparts in terms of lasing threshold (P_th = 3.5 MW·cm^–2) and all existing subwavelength-nanowire lasers in terms of operation temperature (T = 360 K). Such a performance demonstrates the high potential of this all-dielectric platform for integrated photonic applications with low energy costs.

中文翻译：

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全介电亚波长纳米线纳米腔中的低阈值激光发射高达360 K

亚波长纳米线的超小尺寸使其成为紧凑和高能效光子应用的理想候选者，特别是导致了大范围的等离子纳米激光器的实现。但是，基于金属的等离激元平台中的欧姆损耗和短传播长度限制了它们的性能。在这项工作中，我们转而依靠全介电的平台来绕过这些限制：在SiN光子晶体波导中集成了亚波长ZnO纳米线诱导的空腔。由于这种完全电介质纳米腔的光损耗低，因此我们证明了使用亚波长纳米线作为增益材料在高温下的低阈值激光发射。在激射阈值（P _th= 3.5 MW·cm ^–2）和所有现有的亚波长纳米线激光器的工作温度（T = 360 K）。这样的性能证明了这种全电介质平台在集成光子应用中具有低能耗的巨大潜力。