2020年8月4日 · In the latest research, Novelli et al. presented a narrowband THz pump/THz probe experiment using a free electron laser to induce strong anisotropy of liquid water through librational...

2025年1月9日 · In the terahertz (THz) region, various approaches have been independently demonstrated to optimize the nonlinear effects in graphene, addressing a critical limitation arising from the...

2023年10月24日 · Ultrashort terahertz (THz) pulses with sub-pJ energy and 100 V/cm electric field are widely used for time-domain THz spectroscopy (TDTS) 1 and THz imaging 2.

2023年1月28日 · Precisely synchronized X-ray and strong-field coherent terahertz (THz) enable the coherent THz excitation of many fundamental modes (THz pump) and the capturing of X-ray dynamic images of matter (X-ray probe), while the generation of such a light source is still a challenge for most existing techniques.

Time–resolved THz spectroscopy (TRTS) is an optical pump/THz probe technique which is used to study systems in which a visible excitation initiates a change in far-infrared absorption properties on a sub-picosecond timescale.

2009年4月16日 · Pumping n-type GaAs and InSb with ultrafast THz pulses having intensities higher than 150 MW/cm2 shows strong free carrier absorption saturation at temperatures of 300 K and 200 K respectively. If the energy imparted to the carriers exceeds the bandgap, impact ionization processes can occur.

The dynamics of carrier cooling in GaAs and impact ionization in InSb were monitored using THz-pump/THz probe spectroscopy, which provides both sub-bandgap excitation and probing, eliminating any direct optical electron-hole generation that complicates the evaluation of results in optical pump/THz probe experiments.

We report the result of the terahertz pump-terahertz probe spectroscopy of multilayer graphene. The amplitude of the probe pulses deceases after the arrival of the pump pulses with the peak electric field of ~100 kV/cm.

We will give a summary of THz experiments using ultrafast x-ray pulses from free electron lasers as a probe. The first part will be a brief review of our past and current capabilities at SLAC and highlight results that we were able to achieve during the first ten years of operation of LCLS.

2021年10月10日 · The pump excitations in ferroelectrics usually contain ultrafast optical pulse and Terahertz (THz, 1 THz = 10 12 Hz, photon energy ≈4 meV at 1 THz) waves, wherein the THz waves are electromagnetic waves in the range from 0.3 to 30 THz.