---
res:
  bibo_abstract:
  - Metasurfaces are powerful tools for manipulating light using small structures
    on the nanoscale. In most metasurfaces, near-field couplings are treated as being
    unfavorable perturbations. Here, we experimentally investigate a structure consisting
    of sinusoidally modulated silicon waveguides where near-field coupling of local
    resonances leads to negative coupling, i.e., a negative coupling constant. This
    gives rise to wave-vector-dependent eigenstates of elliptical, linear, and circular
    polarizations. In particular, fully circular polarization states are not only
    present at a single point in momentum space (k-space) but also along a line. This
    circular polarization line, as well as a linear polarization line, emanates from
    a polarization degeneracy at the Dirac point. We experimentally validate the existence
    of these eigenstates and demonstrate the energy-, polarization-, and wave vector
    dependence of this metasurface as well as its sensitivity to fabrication tolerances.
    By tuning the incident k-vector, certain polarization-energy eigenstates are strongly
    reflected, allowing for uses in angle-tunable polarization filters and light sources.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Helene
      foaf_name: Wetter, Helene
      foaf_surname: Wetter
  - foaf_Person:
      foaf_givenName: Jan
      foaf_name: Wingenbach, Jan
      foaf_surname: Wingenbach
      foaf_workInfoHomepage: http://www.librecat.org/personId=69187
  - foaf_Person:
      foaf_givenName: Falk
      foaf_name: Rehberg, Falk
      foaf_surname: Rehberg
  - foaf_Person:
      foaf_givenName: Wenlong
      foaf_name: Gao, Wenlong
      foaf_surname: Gao
  - foaf_Person:
      foaf_givenName: Stefan
      foaf_name: Schumacher, Stefan
      foaf_surname: Schumacher
      foaf_workInfoHomepage: http://www.librecat.org/personId=27271
    orcid: 0000-0003-4042-4951
  - foaf_Person:
      foaf_givenName: Thomas
      foaf_name: Zentgraf, Thomas
      foaf_surname: Zentgraf
      foaf_workInfoHomepage: http://www.librecat.org/personId=30525
    orcid: 0000-0002-8662-1101
  bibo_doi: 10.1021/acsphotonics.5c02865
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2330-4022
  - http://id.crossref.org/issn/2330-4022
  dct_language: eng
  dct_publisher: American Chemical Society (ACS)@
  dct_title: Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field
    Coupling@
...