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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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
Artikelnummer99, 155427
TidsskriftPhysical Review B
Vol/bind99, 15
Udgave nummer155427
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

Citer dette

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title = "Quantum spill-out in nanometer-thin gold slabs: Effect on the plasmon mode index and the plasmonic absorption",
abstract = "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.",
keywords = "Nanophotonics, Plasmonics, Surface plasmons, Density functional theory, Electromagnetic wave theory, Transfer matrix method",
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Quantum spill-out in nanometer-thin gold slabs: Effect on the plasmon mode index and the plasmonic absorption. / Skjølstrup, Enok Johannes Haahr; Søndergaard, Thomas Møller; Pedersen, Thomas Garm.

I: Physical Review B, Bind 99, 15, Nr. 155427, 99, 155427, 26.04.2019, s. 1-9.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Quantum spill-out in nanometer-thin gold slabs: Effect on the plasmon mode index and the plasmonic absorption

AU - Skjølstrup, Enok Johannes Haahr

AU - Søndergaard, Thomas Møller

AU - Pedersen, Thomas Garm

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N2 - 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.

AB - 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.

KW - Nanophotonics

KW - Plasmonics

KW - Surface plasmons

KW - Density functional theory

KW - Electromagnetic wave theory

KW - Transfer matrix method

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DO - 10.1103/PhysRevB.99.155427

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