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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2503.00947 |
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| _version_ | 1866910854097666048 |
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| author | Li, Jinxing Jana, Aloke Yuan, Yueyi Zhang, Kuang Burokur, Shah Nawaz Genevet, Patrice |
| author_facet | Li, Jinxing Jana, Aloke Yuan, Yueyi Zhang, Kuang Burokur, Shah Nawaz Genevet, Patrice |
| contents | The classical Pancharatnam-Berry phase, a variant of the geometric phase, arises purely from the modulation of the polarization state of a light beam. Due to its dependence on polarization changes, it cannot be effectively utilized for wavefront shaping in systems that require maintaining a constant (co-polarized) polarization state. Here, we present a novel topologically protected phase modulation mechanism capable of achieving anti-symmetric full 2π phase shifts with near-unity efficiency for two orthogonal co-polarized channels. Compatible with -- but distinct from- - the dynamic phase, this approach exploits phase circulation around a hidden singularity on the surface of the Poincaré sphere. We validate this concept in the microwave regime through the implementation of multi-layer metasurfaces. This new phase modulation mechanism expands the design toolbox of flat optics for light modulation beyond conventional techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_00947 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploiting hidden singularity on the surface of the Poincaré sphere Li, Jinxing Jana, Aloke Yuan, Yueyi Zhang, Kuang Burokur, Shah Nawaz Genevet, Patrice Optics The classical Pancharatnam-Berry phase, a variant of the geometric phase, arises purely from the modulation of the polarization state of a light beam. Due to its dependence on polarization changes, it cannot be effectively utilized for wavefront shaping in systems that require maintaining a constant (co-polarized) polarization state. Here, we present a novel topologically protected phase modulation mechanism capable of achieving anti-symmetric full 2π phase shifts with near-unity efficiency for two orthogonal co-polarized channels. Compatible with -- but distinct from- - the dynamic phase, this approach exploits phase circulation around a hidden singularity on the surface of the Poincaré sphere. We validate this concept in the microwave regime through the implementation of multi-layer metasurfaces. This new phase modulation mechanism expands the design toolbox of flat optics for light modulation beyond conventional techniques. |
| title | Exploiting hidden singularity on the surface of the Poincaré sphere |
| topic | Optics |
| url | https://arxiv.org/abs/2503.00947 |