How Backward Poynting Flows Arise for Surface Plasmon Waves with Lossy Metals

Lee, Hyoung-In; Mok, Jinsik

doi:10.1007/s11468-019-01074-w

Cited by 2 publications

(1 citation statement)

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“…The vector

of length:

tilts the total wave vector

from the interface to the metal side (

, see Figure 5 c) spoiling the longitudinal character of the surface modes [ 69 , 74 ] and leading to the radiation leakage from the interface. The tilt angle of the total wave vector

of length:

is defined by the

).…”

Section: Characteristics Of Surface Plasmons Supported By Metal-dimentioning

confidence: 99%

Impact of the Interband Transitions in Gold and Silver on the Dynamics of Propagating and Localized Surface Plasmons

Kolwas

Derkachova

2020

Nanomaterials

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Understanding and modeling of a surface-plasmon phenomenon on lossy metals interfaces based on simplified models of dielectric function lead to problems when confronted with reality. For a realistic description of lossy metals, such as gold and silver, in the optical range of the electromagnetic spectrum and in the adjacent spectral ranges it is necessary to account not only for ohmic losses but also for the radiative losses resulting from the frequency-dependent interband transitions. We give a detailed analysis of Surface Plasmon Polaritons (SPPs) and Localized Surface Plasmons (LPSs) supported by such realistic metal/dielectric interfaces based on the dispersion relations both for flat and spherical gold and silver interfaces in the extended frequency and nanoparticle size ranges. The study reveals the region of anomalous dispersion for a silver flat interface in the near UV spectral range and high-quality factors for larger nanoparticles. We show that the frequency-dependent interband transition accounted in the dielectric function in a way allowing reproducing well the experimentally measured indexes of refraction does exert the pronounced impact not only on the properties of SPP and LSP for gold interfaces but also, with the weaker but not negligible impact, on the corresponding silver interfaces in the optical ranges and the adjacent spectral ranges.

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“…The vector

of length:

tilts the total wave vector

from the interface to the metal side (

, see Figure 5 c) spoiling the longitudinal character of the surface modes [ 69 , 74 ] and leading to the radiation leakage from the interface. The tilt angle of the total wave vector

of length:

is defined by the

).…”

Section: Characteristics Of Surface Plasmons Supported By Metal-dimentioning

confidence: 99%