发表机构
Photonics Initiative, Advanced Science Research Center, City University of New York; Center for Nano Science and Technology, Fondazione Istituto Italiano di Tecnologia; Physics Program, Graduate Center, City University of New York（纽约市立大学先进科学研究中心光子学倡议; 意大利技术研究院纳米科学与技术中心; 纽约市立大学研究生院物理学项目）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对光频表面等离激元损耗的技术障碍，利用MoOCl₂材料观测到高Q各向异性等离激元极化激元，通过非线性泵浦实现了其寿命的超快可调，为突破损耗限制提供了新途径。
AI 中文摘要
损耗是光频表面等离激元技术应用的主要障碍。近期出现的MoOCl₂是一种具有强各向异性光学特性的关联范德华材料，为突破该限制提供了新途径。我们报道了在该材料中高Q表面等离激元极化激元的远场观测结果，其源于表面等离激元与介质模式的各向异性杂化。随后，我们探究了对这些结构中带内电子向导带的非线性泵浦，与直觉相反，尽管注入了热电子，极化激元共振的寿命却出现了突然增加。这一反直觉现象源于透镜状极化激元共振中光子与等离激元激发的竞争，可在超快速度下实现寿命的大幅可调。
英文摘要
Losses are a major roadblock in the technological implementation of surface plasmons at optical frequencies. The recent emergence of MoOCl2, a correlated van-der-Waals material with strongly anisotropic optical properties, offers new avenues to circumvent this limit. We report the far-field observation of high-Q surface plasmon polaritons in this material, arising from the anisotropic hybridisation of surface plasmons and dielectric modes. We then explore nonlinear pumping of intraband electrons to the conduction band in these structures, leading, contrary to intuition, to an abrupt increase in the lifetime of the polariton resonance, despite the injection of hot electrons. This counterintuitive phenomenon stems from the competition between photon and plasmon excitations in a lenticular polariton resonance, yielding a largely tuneable lifetime at ultrafast speeds.
CommentsManuscript: 17 pages, 4 figures Supplementary Information: 6 pages, 11 figures
