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Coherent radiation with frequencies ranging from 0.3 to 30 THz has recentlybecome accessible by femtosecond laser technology. Terahertz (THz) waves havealready found many applications in spectroscopy and imaging, and they can bemanipulated using static optical elements such as lenses, polarizers, andfilters. However, ultrafast modulation of THz radiation is required as well,for instance in short-range wireless communication or for preparing shaped THztransients for coherent control of numerous material excitations. Here, wedemonstrate an all-optically created transient metamaterial that permits tomanipulate the polarization of THz waveforms with sub-cycle precision. Thepolarization-modulated pulses are potentially interesting for controllingelementary motions such as vibrations of crystal lattices, rotations ofmolecules, and the precession of spins.

Sub-cycle control of terahertz waveform polarization using all-optically induced transient metamaterials