In the light–matter strong coupling regime, the excited state of quantum emitters is inextricably linked to a photonic mode, leading to hybrid states that are part light and part matter. Recently, there has been a huge effort to realize strong coupling with nanoplasmonics, since it provides a versatile environment to study and control molecules in ambient conditions. Among the most promising designs are plasmonic nanocavities that confine light to unprecedentedly small volumes. Such nanocavities, though, support multiple types of modes, with different field profiles and radiative decay rates (bright and dark modes). Here, we show theoretically that the different nature of these modes leads to mode beating within the nanocavity and the Rabi oscillations, which alters the spatiotemporal dynamics of the hybrid system. By specifically designing the illumination setup, we decompose and control the dark and bright plasmon mode excitation and therefore their coupling with quantum emitters. Hence, this work opens new routes for dynamically dressing emitters, to tailor their hybrid states with external radiation.

中文翻译：

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等离子体纳米腔的时空动力学和强耦合控制

在光-物质强耦合机制中，量子发射器的激发态与光子模式有着千丝万缕的联系，从而导致混合态成为部分光和部分物质。近来，为了实现与纳米等离激元的强耦合已经进行了巨大的努力，因为它提供了在环境条件下研究和控制分子的多功能环境。等离子纳米腔是最有前途的设计之一，它们将光限制在前所未有的小体积内。但是，此类纳米腔支持多种类型的模式，具有不同的场剖面和辐射衰减率（亮模式和暗模式）。在这里，我们从理论上证明这些模式的不同性质会导致纳米腔内的模式跳动和Rabi振荡，从而改变了混合系统的时空动力学。通过专门设计照明设置，我们可以分解和控制暗和亮等离激元模式的激发，并因此控制它们与量子发射器的耦合。因此，这项工作为动态修饰发射器开辟了新的途径，以调整其与外部辐射的混合态。