The room temperature strong coupling between the photonic modes of micro/nanocavities and quantum emitters (QEs) can bring about promising advantages for fundamental and applied physics. Improving the electric fields (EFs) by using plasmonic modes and reducing their losses by applying dielectric nanocavities are widely employed approaches to achieve room temperature strong coupling. However, ideal photonic modes with both large EFs and low loss have been lacking. Herein, we propose the abnormal anapole mode (AAM), showing both a strong EF enhancement of ∼70$\sim 70$-fold (comparable to plasmonic modes) and a low loss of 34 meV, which is much smaller than previous records of isolated all-dielectric nanocavities. Besides realizing strong coupling, we further show that by replacing the normal anapole mode with the AAM, the lasing threshold of the AAM-coupled QEs can be reduced by one order of magnitude, implying a vital step toward on-chip integration of nanophotonic devices.

中文翻译：

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基于激子的强光-物质相互作用和具有大场增强和低损耗的异常全电介质折极模式

微/纳米腔的光子模式与量子发射器（QE）之间的室温强耦合可以为基础物理和应用物理带来有希望的优势。通过使用等离子体模式改善电场（EF）并通过应用介电纳米腔减少电场损耗是实现室温强耦合的广泛采用的方法。然而，同时具有大EF和低损耗的理想光子模式一直缺乏。在此，我们提出了异常的阿纳极模式（AAM），它显示出 EF 强增强∼ 70$\sim 70$倍（与等离子体模式相比）和 34 meV 的低损耗，这比以前孤立的全电介质纳米腔的记录要小得多。除了实现强耦合外，我们还进一步证明，通过用AAM取代正常的阿纳极模式，AAM耦合QE的激光阈值可以降低一个数量级，这意味着向纳米光子器件的片上集成迈出了重要的一步。