We explore by theoretical means an extreme renormalisation of the eigenmodes of a dimer of dipolar meta-atoms due to strong light-matter interactions. Firstly, by tuning the height of an enclosing photonic cavity, we can lower the energy level of the symmetric `bright' mode underneath that of the anti-symmetric `dark' mode. This is possible due to the polaritonic nature of the symmetric mode, that shares simultaneously its excitation with the cavity and the dimer. For a heterogeneous dimer, we show that the polariton modes can be smoothly tuned from symmetric to anti-symmetric, resulting in a variable mode localisation from extended throughout the cavity to concentrated around the vicinity of the dimer. In addition, we reveal a critical point where one of the meta-atoms becomes `shrouded', with no response to a driving electric field, and thus the field re-radiated by the dimer is only that of the other meta-atom. We provide an exact analytical description of the system from first principles, as well as full-wave electromagnetic simulations that show a strong quantitative agreement with the analytical model. Our description is relevant for any physical dimer where dipolar interactions are the dominant mechanism.

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通过强光物质耦合对二聚体本征模式进行极端重整化

我们通过理论手段探索了由于强光物质相互作用导致的偶极元原子二聚体的本征模式的极端重整化。首先，通过调整封闭光子腔的高度，我们可以将对称“亮”模式的能级降低到反对称“暗”模式的能级之下。由于对称模式的极化性质，这是可能的，它与腔和二聚体同时共享其激发。对于异质二聚体，我们表明极化子模式可以从对称平滑调整到反对称，导致从整个腔延伸到集中在二聚体附近的可变模式定位。此外，我们揭示了一个临界点，其中一个元原子被“笼罩”，对驱动电场没有反应，因此，二聚体重新辐射的场只是另一个元原子的场。我们从第一性原理以及全波电磁模拟提供了对系统的精确分析描述，这些模拟显示出与分析模型具有很强的定量一致性。我们的描述与偶极相互作用是主要机制的任何物理二聚体相关。