Johannes Bühler, Jonas Allerbeck, Gabriel Fitzky, Daniele Brida, and Alfred Leitenstorfer
https://www.osapublishing.org/optica/abstract.cfm?uri=optica-5-7-821
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.
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