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

TL;DR

This paper demonstrates an all-optically induced transient metamaterial capable of ultrafast, sub-cycle control of terahertz wave polarization, enabling advanced manipulation of THz signals for spectroscopy, imaging, and coherent control applications.

Contribution

It introduces a novel all-optical method to dynamically control THz waveform polarization with sub-cycle precision using transient metamaterials.

Findings

Achieved sub-cycle polarization modulation of THz pulses.

Demonstrated potential for controlling molecular and spin dynamics.

Enabled ultrafast polarization switching in the THz regime.

Abstract

Coherent radiation with frequencies ranging from 0.3 to 30 THz has recently become accessible by femtosecond laser technology. Terahertz (THz) waves have already found many applications in spectroscopy and imaging, and they can be manipulated using static optical elements such as lenses, polarizers, and filters. However, ultrafast modulation of THz radiation is required as well, for instance in short-range wireless communication or for preparing shaped THz transients for coherent control of numerous material excitations. Here, we demonstrate an all-optically created transient metamaterial that permits to manipulate the polarization of THz waveforms with sub-cycle precision. The polarization-modulated pulses are potentially interesting for controlling elementary motions such as vibrations of crystal lattices, rotations of molecules, and the precession of spins.