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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/2501.12899 |
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| _version_ | 1866912199555940352 |
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| author | Nussupbekov, Ayan Zhu, Juan-Feng Akimov, Yuriy Bai, Ping Png, Ching Eng Garcia-Vidal, Francisco J. Wu, Lin |
| author_facet | Nussupbekov, Ayan Zhu, Juan-Feng Akimov, Yuriy Bai, Ping Png, Ching Eng Garcia-Vidal, Francisco J. Wu, Lin |
| contents | This work investigates the effects of time-varying media, where optical properties change over time, on electromagnetic wave propagation, focusing on plane waves and free-electron evanescent waves. We introduce a switching parameter, $τ$, to model ultrafast switching in the femtosecond to nanosecond range. For plane-wave incidence at angular frequency $ω_0$, we derive a generalized expression for the backward-to-forward flux ratio as a function of $ω_0$ and $τ$, aligning with recent experimental data and providing a unified interpretation framework. For free-electron incidence, we observe intensity saturation in temporal transition radiation at $I_{\textrm{max}}$ for $τ\leq τ_{\textrm{0}}$, with both $I_{\textrm{max}}$ and $τ_{\textrm{0}}$ depending on electron speed. These results highlight the importance of precise $τ$ control in experiments to probe time-varying media effectively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_12899 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing dynamics of time-varying media: Beyond abrupt temporal interfaces Nussupbekov, Ayan Zhu, Juan-Feng Akimov, Yuriy Bai, Ping Png, Ching Eng Garcia-Vidal, Francisco J. Wu, Lin Optics This work investigates the effects of time-varying media, where optical properties change over time, on electromagnetic wave propagation, focusing on plane waves and free-electron evanescent waves. We introduce a switching parameter, $τ$, to model ultrafast switching in the femtosecond to nanosecond range. For plane-wave incidence at angular frequency $ω_0$, we derive a generalized expression for the backward-to-forward flux ratio as a function of $ω_0$ and $τ$, aligning with recent experimental data and providing a unified interpretation framework. For free-electron incidence, we observe intensity saturation in temporal transition radiation at $I_{\textrm{max}}$ for $τ\leq τ_{\textrm{0}}$, with both $I_{\textrm{max}}$ and $τ_{\textrm{0}}$ depending on electron speed. These results highlight the importance of precise $τ$ control in experiments to probe time-varying media effectively. |
| title | Probing dynamics of time-varying media: Beyond abrupt temporal interfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2501.12899 |