Observation of space-time nonseparable helical pulses
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866929742472544256 |
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| author | Wang, Ren Shi, Shuai Zhang, Zeyi Wang, Bing-Zhong Mata-Cervera, Nilo Porras, Miguel A. Shen, Yijie |
| author_facet | Wang, Ren Shi, Shuai Zhang, Zeyi Wang, Bing-Zhong Mata-Cervera, Nilo Porras, Miguel A. Shen, Yijie |
| contents | Manipulating optical vortices at ultrafast spatiotemporal coupled domain is still a great challenge in photonics. Especially, the single- or few-cycle level short pulses carrying stable vortex topological charge, called helical pulses, have never been experimentally realized. Here, we introduce two complementary methods for experimentally generating such space-time nonseparable helical pulses (SNHPs) across optical and microwave spectral regimes. We achieve few-cycle quasi-linearly polarized SNHPs through the polarization decomposition of optical toroidal pulses. We also generated exactly single-cycle nontransverse SNHPs directly from a microwave ultrawideband spiral emitter. These approaches not only enable the experimental realization of SNHPs but also provide a platform for further investigation into their properties and applications, such as nontrivial light-matter interactions and optical communications, marking a significant step forward in the field of structured light. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_07851 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of space-time nonseparable helical pulses Wang, Ren Shi, Shuai Zhang, Zeyi Wang, Bing-Zhong Mata-Cervera, Nilo Porras, Miguel A. Shen, Yijie Optics Applied Physics Manipulating optical vortices at ultrafast spatiotemporal coupled domain is still a great challenge in photonics. Especially, the single- or few-cycle level short pulses carrying stable vortex topological charge, called helical pulses, have never been experimentally realized. Here, we introduce two complementary methods for experimentally generating such space-time nonseparable helical pulses (SNHPs) across optical and microwave spectral regimes. We achieve few-cycle quasi-linearly polarized SNHPs through the polarization decomposition of optical toroidal pulses. We also generated exactly single-cycle nontransverse SNHPs directly from a microwave ultrawideband spiral emitter. These approaches not only enable the experimental realization of SNHPs but also provide a platform for further investigation into their properties and applications, such as nontrivial light-matter interactions and optical communications, marking a significant step forward in the field of structured light. |
| title | Observation of space-time nonseparable helical pulses |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2501.07851 |