Effective permittivity of co-evaporated metal-organic mixed films
Abstract
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.
Citation
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
Publication
Journal of Applied Physics
Status
Peer reviewed
ISSN
0021-8979Type
Journal article
Description
Funding: 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).Collections
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