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arXiv 1208.4482physics.optics
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聚焦太赫兹光束纵、横场的普适相位关系

Universal phase relation between longitudinal and transverse fields observed in focused terahertz beams

S. Winnerl, R. Hubrich, M. Mittendorff, H. Schneider, M. Helm

摘要:

我们直接观察纵向电磁场的径向和线偏振的聚焦自由传播太赫兹光束。根据理论,纵向场相对于横向场分量相移π/2的值。这种行为被发现的所有频率成分的单周期太赫兹辐射脉冲。此外,我们表明,径向偏振太赫兹光束的纵向场具有较小的光斑尺寸相比,线偏振光束的横向场,这是在相同的条件下聚焦。

英文摘要:

We directly observe longitudinal electromagnetic fields in focused freely propagating terahertz beams of radial and linear polarization. In accordance with theory, the longitudinal fields are phase shifted by a value of pi/2 with respect to the transverse field components. This behavior is found for all frequency components of single cycle THz radiation pulses. Additionally we show that the longitudinal field of a radially polarized THz beam has a smaller spot size as compared to the transverse field of a linearly polarized beam, that is focused under the same conditions.

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