Numerical study on the limit of quasi-static approximation for plasmonic nanosphere

Dutta, Arpan; Tiainen, Ville; Toppari, J. Jussi

doi:10.1063/5.0001102

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…The optical properties of Au, Ag, and Cu NPs are mainly due to the localized surface plasmon resonance (LSPR). For silver and gold nanoparticles, the resonance falls within the visible region of the electromagnetic spectrum, for which they display striking. − The LSPR consists of damped yet collective oscillations of conduction electrons in a metal nanoparticle triggered by the interaction with an electromagnetic field, e.g., visible light. Thanks to this behavior, plasmonic metal NPs are efficient light harvesters, where their tunable light-matter interactions give rise to applications in photodetection, photocatalysis, solar energy conversion, and related fields .…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxygen Adsorption on the Optical Properties of Ag Nanoparticles

Zerbato,

Farris,

Fronzoni

et al. 2023

J. Phys. Chem. A

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Plasmonic metal nanoparticles are efficient light harvesters with a myriad of sensing- and energy-related applications. For such applications, the optical properties of nanoparticles of metals such as Cu, Ag, and Au can be tuned by controlling the composition, particle size, and shape, but less is known about the effects of oxidation on the plasmon resonances. In this work, we elucidate the effects of O adsorption on the optical properties of Ag particles by evaluating the thermodynamic properties of O-decorated Ag particles with calculations based on the density functional theory and subsequently computing the photoabsorption spectra with a computationally efficient time-dependent density functional theory approach. We identify stable Ag nanoparticle structures with oxidized edges and a quenching of the plasmonic character of the metal particles upon oxidation and trace back this effect to the sp orbitals (or bands) of Ag particles being involved both in the plasmonic excitation and in the hybridization to form bonds with the adsorbed O atoms. Our work has important implications for the understanding and application of plasmonic metal nanoparticles and plasmon-mediated processes under oxidizing environments.

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Section: Introductionmentioning

confidence: 99%

Effects of Oxygen Adsorption on the Optical Properties of Ag Nanoparticles

Zerbato,

Farris,

Fronzoni

et al. 2023

J. Phys. Chem. A

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“…However, more specific, quantitative assessments of the general limits stated by equations (1) and (2) have not been thoroughly performed in literature, with the exception of a recent study specifically focused on gold and silver nanospheres [28].…”

Section: Introductionmentioning

confidence: 99%

On the limits of quasi-static theory in plasmonic nanostructures

Crotti¹,

Schirato²,

Proietti-Zaccaria³

et al. 2021

J. Opt.

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The approximated analytical approach of Quasi-Static Theory (QST) is widely used in modelling the optical response of plasmonic nanoparticles. It is well known that its accuracy is remarkable provided that the particle is much smaller than the wavelength of the interacting radiation and that the ﬁeld induced inside the structure is approximately uniform. Here, we investigate the limits of QST range of validity for gold nanostructures freestanding in air. First, we compare QST predictions of scattering spectra of nanospheres and cylindrical nanowires of various sizes with the exact results provided by Mie scattering theory. We observe a non-monotonic behaviour of the error of QST as a function of the characteristic length of the nanostructures, revealing a non-trivial scaling of its accuracy with the scatterer size. Second, we study nanowires with elliptical section upon diﬀerent excitation conditions by performing ﬁnite element numerical analysis. Comparing simulation results with QST estimates of the extinction cross-section, we ﬁnd that QST accuracy is strongly dependent on the excitation conditions, yielding good results even if the ﬁeld is highly inhomogeneous inside the structure.

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“…The optical properties of such core-shell nanoparticle is calculated using Mie theory [14] implemented in MAT-LAB [15] since the nanoparticle size is beyond the quasistatic limit [16]. We examine the absorption (absorption efficiency, i.e., absorption cross-sections normalized by geometrical cross-section) of the core-shell system since signature of strong coupling is more clearly manifested in that than in the scattering or extinction [17,18].…”

mentioning

confidence: 99%

Weak and Strong Coupling Properties of Surface Excitons

Dutta

Toppari

2023

Preprint

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With high enough doping concentrations organic dye doped polymer materials exhibit negative real part of the permittivity within an energy range just above their material absorption, incurring surface exciton modes at these energies. Here, we report how such modes can be used to realize strong light-matter coupling with photoactive molecules. Our simulations reveal that surface excitons can facilitate strong coupling in terms of induced transparency, however, the polaritons may not be visible in the absorption since they can easily be located outside of the narrow negative permittivity regime. Moreover, we show that the surface exciton modes cannot couple strongly with the surface plasmons. Our findings shed light on the weak and strong coupling properties of surface excitons.

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Numerical study on the limit of quasi-static approximation for plasmonic nanosphere

Abstract: This is a self-archived version of an original article. This version may differ from the original in pagination and typographic details.

Cited by 7 publications

References 12 publications

Effects of Oxygen Adsorption on the Optical Properties of Ag Nanoparticles

Effects of Oxygen Adsorption on the Optical Properties of Ag Nanoparticles

On the limits of quasi-static theory in plasmonic nanostructures

Weak and Strong Coupling Properties of Surface Excitons

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