Here, we demonstrate a strategy that two orthogonal modes in a dielectric cavity can efficiently couple with each other through the bridging effect of a plasmonic antenna. In such a dielectric-antenna hybrid system, a plasmonic antenna can coherently interact with both modes of the dielectric cavity, which brings sufficient coherent energy transfers between the two orthogonal modes. Specifically, a broad electromagnetic mode and a narrow whispering gallery mode (WGM) in a subwavelength silicon disk are considered, where they cannot directly interact with each other through near-field couplings. By introducing a plasmonic antenna, coherent energy transfer between the above two modes occurs, which is confirmed by both far-field spectra and near-field distributions. More investigations show that spectral and spatial overlaps between the involved modes can largely affect energy transfer behaviors. Those overlaps are highly dependent on various parameters of the system. The WGM response in the hybrid system can even exceed that of an individual disk. Our proposed strategy can be extended to other similar systems and the modified optical responses can find applications in enhanced light-matter interactions.

中文翻译：

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由等离子体天线桥接的电介质腔的正交模式之间的相干能量传输

在这里，我们演示了一种策略，即介电腔中的两个正交模式可以通过等离子体天线的桥接效应有效地相互耦合。在这种介质-天线混合系统中，等离子体天线可以与介质腔的两种模式相干相互作用，从而在两种正交模式之间带来足够的相干能量传输。具体来说，考虑了亚波长硅盘中的宽电磁模式和窄回音壁模式（WGM），它们不能通过近场耦合直接相互作用。通过引入等离子体天线，上述两种模式之间发生相干能量转移，远场光谱和近场分布都证实了这一点。更多研究表明，所涉及模式之间的光谱和空间重叠可以在很大程度上影响能量转移行为。这些重叠高度依赖于系统的各种参数。混合系统中的 WGM 响应甚至可以超过单个磁盘的响应。我们提出的策略可以扩展到其他类似的系统，并且修改后的光学响应可以在增强的光与物质相互作用中找到应用。