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    Magnetic and Electric Resonances in Particle-to-Film-Coupled Functional Nanostructures

    Year: 2018

    Journal: ACS Appl. Mater. Interfaces, Volume 10, JAN 24, page 3133–3141

    Authors: Brasse, Yannic; Mueller, Mareen B.; Karg, Matthias; Kuttner, Christian; Koenig, Tobias A. F.; Fery, Andreas

    Organizations: German Science Foundation [SFB 840]; European Research Council [ERC-2012-StG 306686]

    Keywords: gold nanoparticle; core/shell; PNIPAM; gradient; plasmonic; film coupling; magnetic and electric field enhancement

    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 sire. 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.
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