论文标题
在光频率下的双缝度衍射
Double-slit time diffraction at optical frequencies
论文作者
论文摘要
从物理结构的衍射揭示了光的波性质。我们报告了Classic Young的双缝实验的时间域版本：一束光束两次，及时两次，会产生频谱的干扰。 “时间狭缝”足够窄，可以在光频率下产生衍射，是由用高功率红外脉冲照亮的粘胞辛氧化物薄膜产生的，从而诱导快速反射率上升，然后降低速度较慢。时间段之间的分离决定了频谱中振荡的周期，而频率的附带可见性的衰减揭示了时间段的形状。在这里，我们发现了一个惊喜：从现有理论中可以看到的振荡要多，这意味着在1-10 fs左右的前缘的上升时间上升，接近4.4 fs的光学周期。这比泵的宽度快的速度要快，并且可以从频率振荡的衰减中推断出来。
The wave nature of light is revealed by diffraction from physical structures. We report a time-domain version of the classic Young's double-slit experiment: a beam of light twice gated in time produces an interference in the frequency spectrum. The 'time slits', narrow enough to produce diffraction at optical frequencies, are generated from a thin film of Indium-Tin-Oxide illuminated with high-power infrared pulses, inducing a fast reflectivity rise, followed by a slower decay. Separation between the time slits determines the period of oscillations in the frequency spectrum, while the decay of fringe visibility in frequency reveals the shape of the time slits. Here we find a surprise: many more oscillations are visible than expected from existing theory, implying a rise time for the leading edge of around 1-10 fs, approaching an optical cycle of 4.4 fs. This is over an order of magnitude faster than the width of the pump and can be inferred from the decay of the frequency oscillations.
