期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.166802
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资金
- Netherlands Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organization for Scientific Research (NWO)
- European Research Council [290981]
- European Research Council (ERC) [290981] Funding Source: European Research Council (ERC)
We present indications of thermalization and cooling of quasiparticles, a precursor for quantum condensation, in a plasmonic nanoparticle array. We investigate a periodic array of metallic nanorods covered by a polymer layer doped with an organic dye at room temperature. Surface lattice resonances of the array-hybridized plasmonic-photonic modes-couple strongly to excitons in the dye, and bosonic quasiparticles which we call plasmon-exciton polaritons (PEPs) are formed. By increasing the PEP density through optical pumping, we observe thermalization and cooling of the strongly coupled PEP band in the light emission dispersion diagram. For increased pumping, we observe saturation of the strong coupling and emission in a new weakly coupled band, which again shows signatures of thermalization and cooling.
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