1 research outputs found
Magnetic and Electric Resonances in Particle-to-Film-Coupled Functional Nanostructures
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/polyÂ(<i>N</i>-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