Generating topological non-diffracting beams using high quality factor nonlocal metasurfaces
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912617917841408 |
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| author | Kim, Dongha Pelzman, Charles Guo, Cheng Long, Olivia Y. Fan, Shanhui Cho, Sang Yeon |
| author_facet | Kim, Dongha Pelzman, Charles Guo, Cheng Long, Olivia Y. Fan, Shanhui Cho, Sang Yeon |
| contents | Non-diffracting optical beams are essential tools in photonics, enabling robust light transport, super-resolution imaging, and spatiotemporal control. While nonlocal metasurfaces have been proposed for structured-light generation due to their broad angular dispersion and topological characteristics, experimental generation of a non-diffracting beam with nonlocal metasurfaces has not been demonstrated. Here we experimentally realize vortex Bessel beams using a nonlocal metasurface and establish a direct link between non-diffracting-beam generation and photonic band curvature. Depending on the sign of the curvature, the beams exhibit spatially asymmetric non-diffraction, emerging either in front of or behind the metasurface. This asymmetry arises from a radial phase gradient in momentum space, which induces effective space compression or expansion. Furthermore, we demonstrate wavelength-dependent tunability of the beam diameter and propagation distance, and show an order-of-magnitude enhancement in propagation distance compared to conventional Laguerre--Gaussian modes. These results position nonlocal metasurfaces as a compact, tunable platform for spatiotemporally controlled non-diffracting light. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_26142 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generating topological non-diffracting beams using high quality factor nonlocal metasurfaces Kim, Dongha Pelzman, Charles Guo, Cheng Long, Olivia Y. Fan, Shanhui Cho, Sang Yeon Optics Non-diffracting optical beams are essential tools in photonics, enabling robust light transport, super-resolution imaging, and spatiotemporal control. While nonlocal metasurfaces have been proposed for structured-light generation due to their broad angular dispersion and topological characteristics, experimental generation of a non-diffracting beam with nonlocal metasurfaces has not been demonstrated. Here we experimentally realize vortex Bessel beams using a nonlocal metasurface and establish a direct link between non-diffracting-beam generation and photonic band curvature. Depending on the sign of the curvature, the beams exhibit spatially asymmetric non-diffraction, emerging either in front of or behind the metasurface. This asymmetry arises from a radial phase gradient in momentum space, which induces effective space compression or expansion. Furthermore, we demonstrate wavelength-dependent tunability of the beam diameter and propagation distance, and show an order-of-magnitude enhancement in propagation distance compared to conventional Laguerre--Gaussian modes. These results position nonlocal metasurfaces as a compact, tunable platform for spatiotemporally controlled non-diffracting light. |
| title | Generating topological non-diffracting beams using high quality factor nonlocal metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2509.26142 |