Fig. 2 Two-dimensional terahertz (2D-THz) spectroscopy. (IMAGE)
Caption
(a) Scheme of the experiment. Two THz pulses A (excitation) and B (probe) separated by the delay time t interact with a thin water jet (blue, thickness 50 μm). The transmitted THz field is recorded by a phase-resolving detector which makes use of electrooptic sampling (EOS). (b) Time dependent electric field of pulse A (green) and pulse B (orange). The electric field of pulse B transmitted after excitation by pulse A is shown as a dashed line (delay time between pulses A and B t = 7000 fs). (c) Refractive index of water without THz excitation (solid lines) and after generation of electrons (symbols, electron concentration 5x10^-6 moles/liter). Black curves represent the real part of the index of refraction, red curves the imaginary part which is proportional to the THz absorption strength of the water jet. Both real and imaginary part of the refractive index are reduced significantly by the generation of electrons.
Credit
MBI
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