Plasmon response evaluation based on image-derived arbitrary nanostructures

Nanoscale
S TrautmannV Deckert

Abstract

The optical response of realistic 3D plasmonic substrates composed of randomly shaped particles of different size and interparticle distance distributions in addition to nanometer scale surface roughness is intrinsically challenging to simulate due to computational limitations. Here, we present a Finite Element Method (FEM)-based methodology that bridges in-depth theoretical investigations and experimental optical response of plasmonic substrates composed of such silver nanoparticles. Parametrized scanning electron microscopy (SEM) images of surface enhanced Raman spectroscopy (SERS) active substrate and tip-enhanced Raman spectroscopy (TERS) probes are used to simulate the far-and near-field optical response. Far-field calculations are consistent with experimental dark field spectra and charge distribution images reveal for the first time in arbitrary structures the contributions of interparticle hybridized modes such as sub-radiant and super-radiant modes that also locally organize as basic units for Fano resonances. Near-field simulations expose the spatial position-dependent impact of hybridization on field enhancement. Simulations of representative sections of TERS tips are shown to exhibit the same unexpected coupling mod...Continue Reading

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Citations

Mar 21, 2020·Light, Science & Applications·Marie Richard-Lacroix, Volker Deckert
Jun 25, 2019·Frontiers in Chemistry·Angela CapocefaloFabio Domenici
Jan 28, 2021·The Journal of Chemical Physics·K FiederlingS Gräfe
Mar 10, 2021·Light, Science & Applications·Marie Richard-Lacroix, Volker Deckert
Jul 2, 2021·Beilstein Journal of Nanotechnology·Limin WangStephanie Hoeppener
Sep 4, 2019·ACS Nano·Judith LangerLuis M Liz-Marzán
Jul 20, 2019·ACS Applied Materials & Interfaces·Mathilde BouchéDavid P Cormode

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Methods Mentioned

BETA
scanning electron microscopy
AFM

Software Mentioned

Comsol Multiphysics

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