article published yes Helene Wetter author Jan Wingenbach author 69187 Falk Rehberg author Wenlong Gao author Stefan Schumacher author 272710000-0003-4042-4951 Thomas Zentgraf author 305250000-0002-8662-1101 15 department 230 department 289 department 623 department 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. American Chemical Society (ACS)2026 eng 2330-4022 2330-4022 2512.1445210.1021/acsphotonics.5c02865 Wetter H, Wingenbach J, Rehberg F, Gao W, Schumacher S, Zentgraf T. Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling. <i>ACS Photonics</i>. Published online 2026. doi:<a href="https://doi.org/10.1021/acsphotonics.5c02865">10.1021/acsphotonics.5c02865</a> Wetter, H., Wingenbach, J., Rehberg, F., Gao, W., Schumacher, S., &#38; Zentgraf, T. (2026). Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling. <i>ACS Photonics</i>, Article acsphotonics.5c02865. <a href="https://doi.org/10.1021/acsphotonics.5c02865">https://doi.org/10.1021/acsphotonics.5c02865</a> Wetter, Helene, et al. “Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling.” <i>ACS Photonics</i>, acsphotonics.5c02865, American Chemical Society (ACS), 2026, doi:<a href="https://doi.org/10.1021/acsphotonics.5c02865">10.1021/acsphotonics.5c02865</a>. H. Wetter, J. Wingenbach, F. Rehberg, W. Gao, S. Schumacher, T. Zentgraf, ACS Photonics (2026). @article{Wetter_Wingenbach_Rehberg_Gao_Schumacher_Zentgraf_2026, title={Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling}, DOI={<a href="https://doi.org/10.1021/acsphotonics.5c02865">10.1021/acsphotonics.5c02865</a>}, number={acsphotonics.5c02865}, journal={ACS Photonics}, publisher={American Chemical Society (ACS)}, author={Wetter, Helene and Wingenbach, Jan and Rehberg, Falk and Gao, Wenlong and Schumacher, Stefan and Zentgraf, Thomas}, year={2026} } Wetter, Helene, Jan Wingenbach, Falk Rehberg, Wenlong Gao, Stefan Schumacher, and Thomas Zentgraf. “Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling.” <i>ACS Photonics</i>, 2026. <a href="https://doi.org/10.1021/acsphotonics.5c02865">https://doi.org/10.1021/acsphotonics.5c02865</a>. H. Wetter, J. Wingenbach, F. Rehberg, W. Gao, S. Schumacher, and T. Zentgraf, “Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling,” <i>ACS Photonics</i>, Art. no. acsphotonics.5c02865, 2026, doi: <a href="https://doi.org/10.1021/acsphotonics.5c02865">10.1021/acsphotonics.5c02865</a>. 653162026-04-02T07:25:30Z2026-04-02T07:31:24Z