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arXiv 2102.06769physics.optics
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时空塔尔博特效应

The space-time Talbot effect

Layton A. Hall, Murat Yessenov, Sergey A. Ponomarenko, Ayman F. Abouraddy

摘要:

由自由演化的周期性场结构的周期性复兴所体现的塔尔博特效应,已经在空间和时间上分别用不同物理性质的波观察到,其中衍射是前者的基础,色散是后者的基础。迄今为止,组合的时空塔尔博特效应尚未在任何波场中实现,因为衍射和色散是独立的物理现象,通常在不可分割的长度尺度上展开。在这里,我们报告的观察光学“时空”塔尔博特效应,即时空光晶格结构经历周期性复苏后,遭受的影响衍射和色散。所发现的时空复苏是由一个单一的自我成像的长度尺度,其中包括空间和时间的自由度。这种效应的关键是识别一个独特的脉冲光场结构,我们称之为V波,它在自由空间中具有本质上相等的衍射和色散长度,从而使自成像能够在空间和时间上同步进行。

英文摘要:

The Talbot effect, epitomized by periodic revivals of a freely evolving periodic field structure, has been observed with waves of diverse physical nature in space and separately in time, whereby diffraction underlies the former and dispersion the latter. To date, a combined spatio-temporal Talbot effect has not been realized in any wave field because diffraction and dispersion are independent physical phenomena, typically unfolding at incommensurable length scales. Here we report the observation of an optical 'space-time' Talbot effect, whereby a spatio-temporal optical lattice structure undergoes periodic revivals after suffering the impact of both diffraction and dispersion. The discovered space-time revivals are governed by a single self-imaging length scale, which encompasses both spatial and temporal degrees of freedom. Key to this effect is the identification of a unique pulsed optical field structure, which we refer to as a V-wave, that is endowed with intrinsically equal diffraction and dispersion lengths in free space, thereby enabling self-imaging to proceed in lockstep in space and time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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