  We report local field strength enhancement of single-cycle terahertz (THz)
pulses in an ultrafast time-resolved x-ray diffraction experiment. We show that
patterning the sample with gold microstructures increases the THz field without
changing the THz pulse shape or drastically affecting the quality of the x-ray
diffraction pattern. We find a five-fold increase in THz-induced x-ray
diffraction intensity change in the presence of microstructures on a SrTiO3
thin-film sample.
