Abstract
We report the strong coupling between plasmonic surface lattice resonances (SLRs) and photonic Fabry-Pérot (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.
Highlights
Strong light-matter interactions involving confined electromagnetic fields in micro/nano-cavities and/or emitters, such as quantum dots [1], organic molecules [2] or transition metal dichalcogenides [3] are about the coherent exchange of energy between light and matter at resonance, leading to the formation of new hybrid states or particles called polaritons [4,5]
For the plasmonic-photonic coupling system, we observe that the surface lattice resonances (SLRs) is split into two modes that are resonant at λUP = 744.1 nm (i.e., 1.666 eV) and λLP = 819.6 nm (i.e., 1.513 eV)
Thanks to the strong coupling effect, the quality factor is significantly improved for high-energy upper polariton
Summary
Strong light-matter interactions involving confined electromagnetic fields in micro/nano-cavities and/or emitters, such as quantum dots [1], organic molecules [2] or transition metal dichalcogenides [3] are about the coherent exchange of energy between light and matter at resonance, leading to the formation of new hybrid states or particles called polaritons [4,5]. Ameling et al [20] demonstrated that both the localized and propagating surface plasmons can couple strongly with photonic microcavity modes, and the splitting energies were calculated to be 141 meV and 224 meV, corresponding to ∼10% of the resonant energy in the near-infrared regime. Chen et al [25] investigated the strong coupling between magnetic plasmons and photonic F-P cavity modes and obtained a Rabi-type splitting of 78 meV around the resonant wavelength of 772 nm. We will show that, the SLR can strongly couple with the photonic modes of both odd and even orders supported by the F-P microcavity formed by the thin gold film and the MIM multilayers, and splitting energies as high as 153 meV can be obtained in the visible, corresponding to 9.5% of the resonant energy.
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