Effective permittivity of co-evaporated metal-organic mixed films
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The combination of organics and metals in a composite film holds promise for combining plasmonic interaction with gain and for the realization of epsilon-near-zero (ENZ) metamaterials. In particular, fluorescent organic dyes can be used to compensate the plasmonic losses of a homogenized metal-organic material. Here, we fabricate such films through thermal co-evaporation of silver and an organic host:guest system and investigate experimentally the resulting linear optical properties for varying metal concentrations. We extract the effective permittivity of the resulting films with ellipsometry measurements and demonstrate the formation of silver nanoparticles and resulting strong localised surface plasmon resonances, up until a percolation threshold. Through enhanced light-matter interaction, we observe a maximum of the photoluminescence for a concentration of 15% involume of metal in the composite material. These results showcase a variety of growth parameters and will be useful for the future design of gain-compensated plasmonics and ENZ metamaterials.
Mischok , A , Hale , N , Gather , M C & Di Falco , A 2021 , ' Effective permittivity of co-evaporated metal-organic mixed films ' , Journal of Applied Physics , vol. 129 , no. 8 , 083101 . https://doi.org/10.1063/5.0038899
Journal of Applied Physics
Copyright © 2021 the Author(s). Publsihed under licence by AIP Publishing. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1063/5.0038899.
DescriptionFunding: A.M. acknowledges funding through an individual fellowship of the Deutsche Forschungsgemeinschaft (No. 404587082). A.D.F.is supported by the European Research Council (ERC) grant AMPHIBIANS (819346). M.C.G. acknowledges funding by the Volkswagen Foundation within project No. 93404 and the ERC via StG ABLASE (640012).
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