Time-varying Nonlinear Effects in Terahertz Generation
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909311725207552 |
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| author | Lu, Yongchang Zhang, Xueqian Qiu, Haidi Niu, Li Chen, Xieyu Xu, Quan Zhang, Weili Zhang, Shuang Han, Jiaguang |
| author_facet | Lu, Yongchang Zhang, Xueqian Qiu, Haidi Niu, Li Chen, Xieyu Xu, Quan Zhang, Weili Zhang, Shuang Han, Jiaguang |
| contents | Time-varying effects have unveiled new possibilities for manipulating electromagnetic waves through the temporal dimension. In this study, we experimentally explore these effects in the nonlinear optical process of terahertz (THz) generation using optically pumped indium tin oxide (ITO) films. The ultrafast carrier dynamics in the ITO film endow the second-order nonlinear susceptibility (\c{hi}(2)) with sub-picosecond temporal evolution, establishing a temporal boundary for the generated THz waves. We observe significant amplitude and frequency modulations in the THz generation at various transients, attributed to the time-varying complex amplitude of the \c{hi}(2). Moreover, we also observed polarization modulations when further exploiting the tensor properties of \c{hi}(2). This work advances the exploration of time-varying effects into the nonlinear regime through frequency down-conversion, effectively transferring the strong time-varying material response from the near-infrared (NIR) band to the THz band. These findings open up new opportunities for realizing time-varying phenomena that specifically require single-cycle modulation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07266 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Time-varying Nonlinear Effects in Terahertz Generation Lu, Yongchang Zhang, Xueqian Qiu, Haidi Niu, Li Chen, Xieyu Xu, Quan Zhang, Weili Zhang, Shuang Han, Jiaguang Optics Time-varying effects have unveiled new possibilities for manipulating electromagnetic waves through the temporal dimension. In this study, we experimentally explore these effects in the nonlinear optical process of terahertz (THz) generation using optically pumped indium tin oxide (ITO) films. The ultrafast carrier dynamics in the ITO film endow the second-order nonlinear susceptibility (\c{hi}(2)) with sub-picosecond temporal evolution, establishing a temporal boundary for the generated THz waves. We observe significant amplitude and frequency modulations in the THz generation at various transients, attributed to the time-varying complex amplitude of the \c{hi}(2). Moreover, we also observed polarization modulations when further exploiting the tensor properties of \c{hi}(2). This work advances the exploration of time-varying effects into the nonlinear regime through frequency down-conversion, effectively transferring the strong time-varying material response from the near-infrared (NIR) band to the THz band. These findings open up new opportunities for realizing time-varying phenomena that specifically require single-cycle modulation. |
| title | Time-varying Nonlinear Effects in Terahertz Generation |
| topic | Optics |
| url | https://arxiv.org/abs/2409.07266 |