Terahertz imaging with sub-wavelength resolution by femtosecond laser filament in air.
Terahertz imaging with sub-wavelength resolution by femtosecond laser filament in air.
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飞秒激光灯丝在空气中实现亚波长分辨率太赫兹成像
DOI：
10.1038/srep03880
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发表时间：
2014-01-24
影响因子：
4.6
通讯作者：
Xu Z
中科院分区：
文献类型：
--
作者：
Zhao J;Chu W;Guo L;Wang Z;Yang J;Liu W;Cheng Y;Xu Z
太赫兹 (THz) 成像提供生物学、医学和无损评估领域的尖端技术。然而，由于太赫兹波的波长较长，太赫兹成像获得的分辨率通常为几百微米，远低于传统光学成像的分辨率。我们介绍了一种亚波长分辨率太赫兹成像技术，该技术使用飞秒激光灯丝在空气中产生的太赫兹辐射作为探头。该方法基于飞秒激光灯丝在空气中形成太赫兹波的波导这一事实。在灯丝内传播的太赫兹光束的直径从 20μm 到 50μm 不等，明显小于太赫兹波的波长。使用这种高度空间限制的太赫兹光束作为探针，可以实现分辨率高达 20 μm（0.4 THz 时~λ/38）的太赫兹成像。
Terahertz (THz) imaging provides cutting edge technique in biology, medical sciences and non-destructive evaluation. However, due to the long wavelength of the THz wave, the obtained resolution of THz imaging is normally a few hundred microns and is much lower than that of the traditional optical imaging. We introduce a sub-wavelength resolution THz imaging technique which uses the THz radiation generated by a femtosecond laser filament in air as the probe. This method is based on the fact that the femtosecond laser filament forms a waveguide for the THz wave in air. The diameter of the THz beam, which propagates inside the filament, varies from 20 μm to 50 μm, which is significantly smaller than the wavelength of the THz wave. Using this highly spatially confined THz beam as the probe, THz imaging with resolution as high as 20 μm (~λ/38 at 0.4 THz) can be realized.
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影响因子：
8.6
作者：
Babushkin, I.;Kuehn, W.;Elsaesser, T.
通讯作者：
Elsaesser, T.
影响因子：
8.6
作者：
Dai, Jianming;Xie, Xu;Zhang, X. -C.
通讯作者：
Zhang, X. -C.
影响因子：
4
作者：
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通讯作者：
Johnson, Keith
影响因子：
3.3
作者：
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通讯作者：
Kim, K. Y.
影响因子：
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作者：
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通讯作者：
Chin, See Leang