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Perfectly Absorbing Exceptional Points and Chiral Absorbers

Sweeney, William R ; Hsu, Chia Wei ; Rotter, Stefan ; Stone, A Douglas

Physical review letters, 2019-03, Vol.122 (9), p.093901-093901, Article 093901 [Periódico revisado por pares]

United States: American Physical Society

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  • Título:
    Perfectly Absorbing Exceptional Points and Chiral Absorbers
  • Autor: Sweeney, William R ; Hsu, Chia Wei ; Rotter, Stefan ; Stone, A Douglas
  • Assuntos: Absorption ; Acoustic noise ; Coalescing ; Line shape ; Parameters ; Scattering coefficients
  • É parte de: Physical review letters, 2019-03, Vol.122 (9), p.093901-093901, Article 093901
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We identify a new kind of physically realizable exceptional point (EP) corresponding to degenerate coherent perfect absorption, in which two purely incoming solutions of the wave operator for electromagnetic or acoustic waves coalesce to a single state. Such non-Hermitian degeneracies can occur at a real-valued frequency without any associated noise or nonlinearity, in contrast to EPs in lasers. The absorption line shape for the eigenchannel near the EP is quartic in frequency around its maximum in any dimension. In general, for the parameters at which an operator EP occurs, the associated scattering matrix does not have an EP. However, in one dimension, when the S matrix does have a perfectly absorbing EP, it takes on a universal one-parameter form with degenerate values for all scattering coefficients. For absorbing disk resonators, these EPs give rise to chiral absorption: perfect absorption for only one sense of rotation of the input wave.
  • Editor: United States: American Physical Society
  • Idioma: Inglês
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