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

Research output: Contribution to journalJournal articleResearchpeer-review

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.
Original languageEnglish
Article number99, 155427
JournalPhysical Review B
Volume99, 15
Issue number155427
Pages (from-to)1-9
Number of pages9
ISSN0163-1829
DOIs
Publication statusPublished - 26 Apr 2019

Keywords

    Cite this

    @article{99bb535474454a6ba2d6461f82b9f4de,
    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",
    author = "Skj{\o}lstrup, {Enok Johannes Haahr} and S{\o}ndergaard, {Thomas M{\o}ller} and Pedersen, {Thomas Garm}",
    year = "2019",
    month = "4",
    day = "26",
    doi = "10.1103/PhysRevB.99.155427",
    language = "English",
    volume = "99, 15",
    pages = "1--9",
    journal = "Physical Review B",
    issn = "2469-9950",
    publisher = "American Physical Society",
    number = "155427",

    }

    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.

    In: Physical Review B, Vol. 99, 15, No. 155427, 99, 155427, 26.04.2019, p. 1-9.

    Research output: Contribution to journalJournal articleResearchpeer-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

    PY - 2019/4/26

    Y1 - 2019/4/26

    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

    U2 - 10.1103/PhysRevB.99.155427

    DO - 10.1103/PhysRevB.99.155427

    M3 - Journal article

    VL - 99, 15

    SP - 1

    EP - 9

    JO - Physical Review B

    JF - Physical Review B

    SN - 2469-9950

    IS - 155427

    M1 - 99, 155427

    ER -