Accuracy of surface integral equation matrix elements in plasmonic calculations

Raziman, T. V.; Somerville, Walter R. C.; Martin, Olivier J. F.; Ru, Eric C. Le

doi:10.1364/josab.32.000485

Cited by 37 publications

(42 citation statements)

References 37 publications

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“…Simulation Methods : The SIE method was used to numerically compute the scattering spectrum of the 4‐NRSAs . For silver, a realistic dielectric function was taken (Johnson and Christy) and the surrounding refractive index was set to 1.33 to approximately compensate the substrate‐induced frequency shift for nanoparticle plasmon resonances …”

Section: Methodsmentioning

confidence: 99%

Strong Improvement of Long-Term Chemical and Thermal Stability of Plasmonic Silver Nanoantennas and Films

Wang

Santschi

Martin

2017

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Silver (Ag) nanostructures and thin films are advantageous plasmonic materials as they have significantly lower losses than gold (Au). Unfortunately, Ag nanostructures suffer from poor chemical and thermal stability, which limit their applications. Here, the mechanisms leading to the deterioration of Ag nanostructures are clarified. It is first shown that oxygen alone cannot oxidize Ag nanostructures. Then, experiments using X‐ray photoelectron spectroscopy reveal that the amount of sulfur in ambient air is too low for efficient tarnishing of the Ag surface. Finally, water is found to be the most critical factor for the degradation of Ag nanostructures and thin films. At high relative humidity, adsorbed water forms a thin film enabling the migration of Ag ions at the Ag/air interface, which deteriorates the Ag nanostructures. A dehydration treatment is developed which alters the morphology of the deposited silver, leading to an improved chemical and thermal stability of the Ag nanostructures and films, which then remain stable for more than 14 weeks under ambient laboratory conditions. In addition, dehydration also improves significantly the root‐mean‐square roughness for Ag thin films deposited on a glass substrate.

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Section: Methodsmentioning

confidence: 99%

Strong Improvement of Long-Term Chemical and Thermal Stability of Plasmonic Silver Nanoantennas and Films

Wang

Santschi

Martin

2017

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“…We also demonstrate that though the electric field intensity landscape in the lattice is hexagonally symmetric, phase variations result in a flip asymmetry in forces. To obtain a better physical understanding of the general theoretical results, we also compare them with the dipole approximation and numerical calculations using the surface integral equation (SIE) method [51][52][53]. Finally, we show that the force asymmetry further manifests in the optical binding between particles trapped in the lattice.…”

Section: Introductionmentioning

confidence: 94%

Universal trapping in a three-beam optical lattice

Raziman

Martin

2018

Phys. Rev. A

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“…The local‐field properties on the particle surface are calculated either within the common electrostatic approximation (EA) [ 25 ] or using a novel improved electrostatic approximation (IEA), [ 26 ] which includes radiative damping, depolarization effects, and interactions with higher order multipoles, thus giving excellent agreement with exact T‐matrix solutions [ 27 ] over a much wider range of particle size. The results are also compared with more realistic cigar‐like particle model, calculated from surface integral equation (SIE) [ 28,29 ] simulations.…”

Section: Introductionmentioning

confidence: 99%

Analytical solutions for the surface‐ and orientation‐averaged SERS enhancement factor of small plasmonic particles

Khlebtsov

2020

J Raman Spectroscopy

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We derive analytical expressions for the surface‐ and orientation‐averaged surface enhanced Raman scattering factor (SERS EF) for small plasmonic spheroids. These expressions are derived taking into account the Stokes shift and are shown to result in very different EFs to those in the |E|4‐approximation for experimentally relevant parameters. The optical properties of spheroids are treated in terms of the common and improved electrostatic approximations (EA and IEA). The latter is newly introduced here and includes radiative damping, depolarization effects, and interactions with higher order multipoles, thus giving perfect agreement with exact T‐matrix calculations of far‐field cross sections and near‐field SERS EFs over a much wider range of sizes. These accurate analytical expressions will be particularly relevant to SERS experiments in colloidal solutions where surface averaging (because of random molecular adsorption) and particle orientation averaging must both be taken into account. Comparison with recent experimental data and simulations for cigar‐like particles show that the spheroid model tends to overestimate the SERS EF because of the higher curvature at the tips. Possible ways to generalize the analytic solution to other axially symmetrical particles are discussed.

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Accuracy of surface integral equation matrix elements in plasmonic calculations

Cited by 37 publications

References 37 publications

Strong Improvement of Long-Term Chemical and Thermal Stability of Plasmonic Silver Nanoantennas and Films

Strong Improvement of Long-Term Chemical and Thermal Stability of Plasmonic Silver Nanoantennas and Films

Universal trapping in a three-beam optical lattice

Analytical solutions for the surface‐ and orientation‐averaged SERS enhancement factor of small plasmonic particles

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