COMP Centre of Excellence, Department of Applied Physics, Aalto University , FI-00076 Aalto, Finland.
Nano Lett. 2014;14(4):1721-7. doi: 10.1021/nl4035219. Epub 2013 Dec 13.
We show strong coupling involving three different types of resonances in plasmonic nanoarrays: surface lattice resonances (SLRs), localized surface plasmon resonances on single nanoparticles, and excitations of organic dye molecules. The measured transmission spectra show splittings that depend on the molecule concentration. The results are analyzed using finite-difference time-domain simulations, a coupled-dipole approximation, coupled-modes models, and Fano theory. The delocalized nature of the collective SLR modes suggests that in the strong coupling regime molecules near distant nanoparticles are coherently coupled.
表面晶格共振（SLR）、单个纳米粒子上的局域表面等离子体共振以及有机染料分子的激发。测量的透射光谱显示出与分子浓度有关的分裂。结果使用有限差分时域模拟、偶极子近似、耦合模式模型和费诺理论进行了分析。集体 SLR 模式的非定域性质表明，在强耦合 regime 下，远离纳米粒子的分子是相干耦合的。
