We theoretically report a strong light–matter interaction in a sandwich structure composed of hybridized inorganic–organic perovskite nanowires, silica (SiO₂) films and a silver (Ag) film. Surface plasmon effectively enhances the strong exciton–photon coupling strength of perovskite nanowires, which depends on reduction of effective mode volume and local field enhancement. By calculation, we find that the thicknesses of SiO₂ and Ag films can affect the coupling strength. With the suitable thickness of SiO₂ (5 nm) and Ag (30 nm) films, Rabi splitting can reach 319 meV, while without an Ag film Rabi splitting is only 270 meV. Furthermore, Rabi splitting shows a negative correlation with SiO₂ film thickness within a limited range. Still, it has a nonlinear relation with Ag film thickness because the imaginary part of the effective index for the hybridized mode shows a nonlinear relation with Ag film thickness. Our structure provides suitable parameters for the experiment and has potential application in nano-lasers.

中文翻译：

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钙钛矿纳米线-金属膜-钙钛矿纳米线杂化结构中基于表面等离子体放大强激子-光子耦合的理论研究

_{我们理论上报告了由杂化的无机-有机钙钛矿纳米线、二氧化硅 (SiO 2} ) 薄膜和银 (Ag) 薄膜组成的夹层结构中的强光-物质相互作用。表面等离子体有效地增强了钙钛矿纳米线的强激子-光子耦合强度，这取决于有效模式体积的减小和局部场的增强。通过计算，我们发现SiO ₂和Ag薄膜的厚度会影响耦合强度。在SiO ₂ (5 nm) 和Ag (30 nm) 薄膜厚度合适的情况下，Rabi 分裂可以达到319 meV，而没有Ag 膜的Rabi 分裂只有270 meV。_{此外，Rabi 分裂与 SiO 2}呈负相关薄膜厚度在有限的范围内。尽管如此，它与银膜厚度具有非线性关系，因为杂化模式的有效指数的虚部显示出与银膜厚度的非线性关系。我们的结构为实验提供了合适的参数，并在纳米激光器中具有潜在应用。