Terahertz frequency conversion at plasma-induced time boundary
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866918105585811456 |
|---|---|
| author | Huang, Yindong Zhou, Bin Xuan, Aijun Gao, Mingxin Lou, Jing Qu, Xiaomin Zhao, Zengxiu Shang, Ce Wang, Xuchen Chang, Chao Asadchy, Viktar |
| author_facet | Huang, Yindong Zhou, Bin Xuan, Aijun Gao, Mingxin Lou, Jing Qu, Xiaomin Zhao, Zengxiu Shang, Ce Wang, Xuchen Chang, Chao Asadchy, Viktar |
| contents | We report on the frequency conversions of terahertz (THz) waves at ultrafast time boundaries created via femtosecond laser-induced air-to-plasma phase transitions. Our combined experimental and theoretical approach reveals that the abrupt change in refractive index at the ultrafast time boundaries drives both the red and blue shifts over the broadband THz spectrum due to the dispersive plasma, with distinctive amplitude variations. The present study contrasts these effects with those from spatial boundaries, highlighting the superior efficacy of temporal manipulations for spectral engineering. These findings not only deepen the understanding of light-matter interactions in time-varying media but also pave the way for innovative applications in THz technology and lay the groundwork for the observation of temporal reflection effects, photonic time crystals, and spatio-temporally modulated matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_20663 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Terahertz frequency conversion at plasma-induced time boundary Huang, Yindong Zhou, Bin Xuan, Aijun Gao, Mingxin Lou, Jing Qu, Xiaomin Zhao, Zengxiu Shang, Ce Wang, Xuchen Chang, Chao Asadchy, Viktar Optics Plasma Physics We report on the frequency conversions of terahertz (THz) waves at ultrafast time boundaries created via femtosecond laser-induced air-to-plasma phase transitions. Our combined experimental and theoretical approach reveals that the abrupt change in refractive index at the ultrafast time boundaries drives both the red and blue shifts over the broadband THz spectrum due to the dispersive plasma, with distinctive amplitude variations. The present study contrasts these effects with those from spatial boundaries, highlighting the superior efficacy of temporal manipulations for spectral engineering. These findings not only deepen the understanding of light-matter interactions in time-varying media but also pave the way for innovative applications in THz technology and lay the groundwork for the observation of temporal reflection effects, photonic time crystals, and spatio-temporally modulated matter. |
| title | Terahertz frequency conversion at plasma-induced time boundary |
| topic | Optics Plasma Physics |
| url | https://arxiv.org/abs/2507.20663 |