Strong THz fields and nonlinear THz interactions with charges, dipoles, and spins
Dramatic advances in tabletop generation of THz pulses with high field levels have enabled nonlinear THz spectroscopy and THz control over molecules and materials. The most widely used approach for generation of strong fields in the 0.2-2 THz range involves excitation of phonon-polaritons in ferroelectric host crystals, and a THz polaritonics platform has been developed that includes capabilities for THz field control and visualization as well as direct and strong coupling to collective spin waves (magnons). Recent developments in THz generation, nonlinear spectroscopy, and control over...