Strong Coupling between Plasmonic Surface Lattice Resonance and Photonic Microcavity Modes

We report the strong coupling between plasmonic surface lattice resonances (SLRs) and photonic Fabry-Perot (F-P) resonances in a microcavity embedded with two-dimensional periodic array of metal-insulator-metal nanopillars. For such a plasmonic-photonic system, we show that the SLR can be strongly coupled to the F-P resonances of both the odd- and even orders, and that the splitting energy reaches as high as 153 meV in the visible regime. Taking advantage of the strong coupling, the resulted high-energy upper polariton has similar characteristics as the plasmonic SLR, but the quality factor is almost twice of that of the SLR. We expect that this work will provide a new scheme for strong coupling between plasmonic and photonic modes, and will point to a new direction to improve the quality factor of SLRs.

Automated summary

This study demonstrates the strong coupling between plasmonic surface lattice resonances and photonic Fabry-Perot resonances in a microcavity embedded with a periodic array of metal-insulator-metal nanopillars. The high-energy upper polaritons resulting from this coupling exhibit similar characteristics as the plasmonic SLR, with an almost double quality factor. The work provides a new scheme for strong coupling between plasmonic and photonic modes and suggests a new direction for improving the quality factor of SLRs.