Polarization- and wave-vector selective optical metasurface with near-field coupling
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911322848886784 |
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| author | Wetter, Helene Wingenbach, Jan Rehberg, Falk Gao, Wenlong Schumacher, Stefan Zentgraf, Thomas |
| author_facet | Wetter, Helene Wingenbach, Jan Rehberg, Falk Gao, Wenlong Schumacher, Stefan Zentgraf, Thomas |
| contents | Metasurfaces are a powerful tool for manipulating light using small structures on the nanoscale. In most meta-surfaces, near-field couplings are treated as 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 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. By tuning the incident k-vector, certain polarization-energy eigenstates are strongly reflected allowing for uses in angle-tunable polarization filters and light sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_14452 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polarization- and wave-vector selective optical metasurface with near-field coupling Wetter, Helene Wingenbach, Jan Rehberg, Falk Gao, Wenlong Schumacher, Stefan Zentgraf, Thomas Optics Mesoscale and Nanoscale Physics Metasurfaces are a powerful tool for manipulating light using small structures on the nanoscale. In most meta-surfaces, near-field couplings are treated as 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 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. By tuning the incident k-vector, certain polarization-energy eigenstates are strongly reflected allowing for uses in angle-tunable polarization filters and light sources. |
| title | Polarization- and wave-vector selective optical metasurface with near-field coupling |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2512.14452 |