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| 飞秒激光光丝区域的太赫兹束缚模式研究 |
| Study of terahertz bound modes in femtosecond laser filamentation region |
| 投稿时间：2024-12-23 |
| DOI：10.3969/j.issn.1005-5630.202412230110 |
| 中文关键词: 飞秒激光 等离子体光丝 太赫兹波 束缚态 微积分效应 |
| 英文关键词:femtosecond laser plasma filament terahertz wave bound state calculus effect |
| 基金项目:上海市青年科技启明星计划（22QC1400300） |
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| 中文摘要: |
| 飞秒激光脉冲聚焦成丝后，理论上可以产生太赫兹波的束缚模式，但由于光丝内部光强极高，现有探测方法难以直接观测。针对该问题，提出了一种新的近场调控与远场诊断方法：将金属平板平行逼近光丝至亚太赫兹波长距离，并与光丝区域边缘的太赫兹环状模式相互作用，使其从原本的对称束缚态转变为非对称束缚态。这一模式转变在理论上表现为太赫兹时域波形的宽带微积分运算。实验结果表明，两种模式状态下的太赫兹时域信号确实存在预期的微积分关系，这就证实了光丝区域太赫兹束缚模式的存在。本研究为观测和调控激光光丝与太赫兹波的相互作用提供了一种新的方法，并为二者的耦合效应与空间束缚现象提供了新的见解。 |
| 英文摘要: |
| Femtosecond laser pulses can theoretically generate terahertz wave bound modes when focused into filaments. However, due to the extremely high light intensity within the filament, existing detection methods face significant challenges in directly observing these modes. To address this issue, this paper proposes a novel near-field control and far-field diagnostic method. Specifically, by placing a metal plate parallel to the filament at a sub-terahertz wavelength distance and interacting with the terahertz ring-like mode at the edge of the filament region, the symmetric bound state is transformed into an asymmetric bound state. This mode transition is theoretically manifested as broadband calculus operations of the terahertz time-domain waveform. Experimental results also show that the terahertz time-domain signals in the two mode states indeed exhibit the expected micro-integral relationship, confirming the existence of terahertz bound modes in the filament region. This study provides a new method for observing and controlling the interaction between laser filaments and terahertz waves, offering new insights into the coupling effects and spatial bound phenomena between the two. |
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