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Authors Brasse, Y. ; Muller, M. B. ; Karg, M. ; Konig, T. ; Fery, A.
Title Magnetic and electric resonances in particle-to-film coupled functional nanostructures
Date 21.02.2018
Number 53218
Abstract We investigate the plasmonic coupling of metallic nanoparticles with continuous metal films by studying the effect of the particle-to-film distance, cavity geometry, and particle size. To efficiently screen these parameters, we fabricated a particle-to-film-coupled functional nanostructure for which the particle size and distance vary. We use gold-core/poly(N-isopropylacrylamide)-shell nanoparticles to self-assemble a monolayer of well-separated plasmonic particles, introduce a gradient in the nanoparticle size by an overgrowth process, and finally add a coupling metal film by evaporation. These assemblies are characterized using surface probing and optical methods to show localized magnetic and electric field enhancement. The results are in agreement with finite-difference time-domain modeling methods and calculations of the effective permeability and permittivity. Finally, we provide a proof of concept for dynamic tuning of the cavity size by swelling of the hydrogel layer. Thus, the tunability of the coupled resonance and the macroscopic self-assembly technique provides access to a cost-efficient library for magnetic and electric resonances.
Publisher ACS Applied Materials & Interfaces
Wikidata
Citation ACS Applied Materials & Interfaces 10 (2018) 3133-3141
DOI https://doi.org/10.1021/acsami.7b16941
Tags core/shell gold nanoparticle gradient magnetic and electric field enhancement plasmonic film coupling pnipam

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