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Superanomalous Skin Effect for Surface Plasmon Polaritons.

I A Larkin1, K Keil2, A Vagov2

  • 1Institute of Microelectronics Technology, Russian Academy of Sciences, 142432 Chernogolovka, Russia.

Physical Review Letters
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Surface plasmon-polariton (SPP) field decay in metals is not exponential but slower, following a "superanomalous" inverse-distance dependence due to metal nonlocality. This finding challenges existing models of SPP propagation.

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Area of Science:

  • Condensed matter physics
  • Plasmonics
  • Electromagnetism

Background:

  • Surface plasmon-polaritons (SPPs) are crucial for nanoscale optics.
  • Conventional models predict exponential decay of SPP fields within metals.

Purpose of the Study:

  • To investigate the decay behavior of SPP fields in metals beyond the standard exponential model.
  • To identify the underlying physical mechanisms governing SPP decay.

Main Methods:

  • Theoretical analysis of SPP propagation at metal-dielectric interfaces.
  • Consideration of nonlocal effects and dielectric permittivity singularities in metals.

Main Results:

  • SPP fields exhibit a slower, superanomalous decay, inversely proportional to distance with a logarithmic correction.
  • This decay deviates from the standard anomalous skin effect.
  • The phenomenon is linked to metal nonlocality and permittivity singularities.

Conclusions:

  • The standard exponential decay model for SPPs is incomplete.
  • Superanomalous decay is a significant factor in understanding SPP propagation in metals.
  • This effect is more pronounced for higher-frequency SPP modes.