Active control of phase matching in nonlinear metasurfaces using Pancharatnam--Berry phase
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | |
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| _version_ | 1866913116696084480 |
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| author | Mekhael, Madona Calpe, Roman Hakala, Tommi K. Fickler, Robert Huttunen, Mikko J. |
| author_facet | Mekhael, Madona Calpe, Roman Hakala, Tommi K. Fickler, Robert Huttunen, Mikko J. |
| contents | Reconfiguring the spectral output of nonlinear metasurfaces after fabrication remains challenging. We address this by exploiting the nonlinear Pancharatnam--Berry phase of $C_{3v}$-symmetric plasmonic metasurfaces. By integrating two metasurfaces inside a multipass cell, we experimentally demonstrate continuous spectral tuning of second-harmonic generation (SHG) phase-matching peaks across a 900--970 nm pump range by rotating one metasurface relative to the other. The extracted geometric phase follows the $3σθ$ dependence, and a full $2π$ tuning cycle is completed with $120^{\circ}$ of physical rotation. This establishes geometric-phase metasurfaces as a reconfigurable nonlinear platform, where mechanical rotation enables post-fabrication and broadband tuning of nonlinear optical responses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_11914 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Active control of phase matching in nonlinear metasurfaces using Pancharatnam--Berry phase Mekhael, Madona Calpe, Roman Hakala, Tommi K. Fickler, Robert Huttunen, Mikko J. Optics Reconfiguring the spectral output of nonlinear metasurfaces after fabrication remains challenging. We address this by exploiting the nonlinear Pancharatnam--Berry phase of $C_{3v}$-symmetric plasmonic metasurfaces. By integrating two metasurfaces inside a multipass cell, we experimentally demonstrate continuous spectral tuning of second-harmonic generation (SHG) phase-matching peaks across a 900--970 nm pump range by rotating one metasurface relative to the other. The extracted geometric phase follows the $3σθ$ dependence, and a full $2π$ tuning cycle is completed with $120^{\circ}$ of physical rotation. This establishes geometric-phase metasurfaces as a reconfigurable nonlinear platform, where mechanical rotation enables post-fabrication and broadband tuning of nonlinear optical responses. |
| title | Active control of phase matching in nonlinear metasurfaces using Pancharatnam--Berry phase |
| topic | Optics |
| url | https://arxiv.org/abs/2605.11914 |