Quantitative Understanding of the Optical Properties of a Single, Complex-Shaped Gold Nanoparticle from Experiment and Theory

Perassi, Eduardo Marcelo; Hrelescu, Calin; Wisnet, Andreas; Döblinger, Markus; Scheu, Christina; Jäckel, Frank; Coronado, Eduardo A.; Feldmann, Jochen

doi:10.1021/nn406270z

Cited by 32 publications

(30 citation statements)

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“…In the nanometer scale regime, studies of the optical response of arbitrary and realistic 3D structures have also raised great interest in the past few years. 23,[32][33][34][35] To date, none of those studies have combined realistic 3D particle shape with larger microscopic scale organization.…”

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confidence: 99%

Plasmon response evaluation based on image-derived arbitrary nanostructures

et al. 2018

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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 modes. Near-field simulations suggest that these modes can contribute up to 50% of the amplitude of the plasmon resonance at the tip apex but, interestingly, have a small effect on its frequency in the visible range. The band position is shown to be extremely sensitive to particle nanoscale roughness, highlighting the necessity to preserve detailed information at both the largest and the smallest scales. To the best of our knowledge, no currently available method enables reaching such a detailed description of large scale realistic 3D plasmonic systems.

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confidence: 99%

Plasmon response evaluation based on image-derived arbitrary nanostructures

et al. 2018

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“…51,52 Recently, DDA is used to analyze surface plasmon properties of materials of different shape 54,55 and the method shows acceptable agreement between modeling and experiment. [56][57][58][59] In the DDA method, the arbitrary-shaped target is divided into a cubic lattice of N dipoles, where N is the number of dipoles. The interdipole separation is small enough compared to the target length and the ambient wavelength.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Interband π Plasmon of Graphene Nanopores: A Potential Sensing Mechanism for DNA Nucleotides

et al. 2016

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We propose a potential sensing mechanism for DNA nucleotides by using interband π surface plasmon resonance (SPR) of graphene nanopore. The SPR and field enhancement properties are investigated by employing discrete dipole approximation (DDA) and finitedifference-time-domain (FDTD) methods, respectively. For graphene nanopores smaller than 10 nm in length, increasing the pore diameter redshifts the SPR peak wavelength and for larger sheets, it is rather unchanged by variation of the pore diameter. Presentation of a single nucleotide to the pore significantly changes SPR properties of the graphene nanopore and each nucleotide has a unique SPR properties. Each nucleotide induces 2 nm to 12 nm shift in the peak wavelengths of each SPR modes and if we consider simultaneously all the modes, type of the presented DNA nucleotide can be clearly determined. Our results show that the small-sizesensitive interband π plasmon in graphene nanopore is probably applicable as a new sensing mechanism for DNA nucleotides.

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“…1,[9][10][11][12] Recently, these ideal sized metal (Au) nanoparticles have been used in various technological and biomedical applications such as organic photovoltaic, 9 drug delivery systems (DDSs), 10 sensory probes, 11,12 pharmaceutical and therapeutic applications, catalysis and electronic conductors. [11][12][13][14] The size, shape and morphology/geometry of gold nanoparticles are changeable by tuning their physical and chemical properties. [1][2][3][4][5]15 These polar solvents propagate the interactions between the solvent molecules and metal particles to reduce the size and change the surface chemistry of nanoparticles through the aggregation and this aggregation can be avoided through the sonication methods.…”

Section: Introductionmentioning

confidence: 99%