Electromagnetic transients with a steep onset of the electric field represent the optical analog to acoustic shockwaves. Impulsive excitation of an electron-hole plasma with 8 fs pulses activates the reflection of high-field terahertz transients from a semiconductor surface on a deeply subcycle timescale. The resulting waveforms display a few-femtosecond rise of the electric field, equivalent to a broadening of their spectral content by several octaves. Such synthetic waveforms with subcycle shaping can be used, for example, as a tool to study extreme transport phenomena in condensed matter.

中文翻译：

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精确的子周期电场切割产生的太赫兹冲击波

具有陡峭电场开始的电磁瞬变代表了类似于声冲击波的光学模拟。以8 fs脉冲对电子空穴等离子体进行脉冲激发，可在深子周期时标上激活高场太赫兹瞬变从半导体表面的反射。生成的波形显示出电场上升了几飞秒，相当于将其频谱内容扩展了几个八度。具有子周期整形的这种合成波形例如可以用作研究凝结物中的极端传输现象的工具。