Quantum spill-out in nanometer-thin gold slabs: Effect on the plasmon mode index and the plasmonic absorption

Enok Johannes Haahr Skjølstrup, Thomas Møller Søndergaard, Thomas Garm Pedersen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

2 Citationer (Scopus)
41 Downloads (Pure)

Abstrakt

A quantum mechanical approach and local response theory are applied to study plasmons propagating in nanometer-thin gold slabs sandwiched between different dielectrics. The metal slab supports two different kinds of modes, classified as long- and short-range plasmons. Quantum spill-out is found to significantly increase the imaginary part of their mode indices, and, surprisingly, even for slabs wide enough to approach bulk the increase is 20%. This is explained in terms of enhanced plasmonic absorption, which mainly takes place in narrow regions located near the slab surface.
OriginalsprogEngelsk
Artikelnummer155427
TidsskriftPhysical Review B
Vol/bind99
Udgave nummer15
Sider (fra-til)1-9
Antal sider9
ISSN0163-1829
DOI
StatusUdgivet - 26 apr. 2019

Emneord

  • Nanophotonics
  • Plasmonics
  • Surface plasmons
  • Density functional theory
  • Electromagnetic wave theory
  • Transfer matrix method

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