Strong-field interaction of solids with terahertz and infrared radiation

In this work we experimentally investigated strong IR and THz electric field light-matter interaction with semiconductor and dielectric solids. During the strong-field IR experiments we observed a generation of a new spectrum for crystalline and polycrystalline diamond samples. In case of the strong THz experiments, 3 types of non-linear phenomenon were observed: THz-inducedchange of a refractive index, generation of a new spectrum and anomalous THzinduced absorption. It was found that the observed non-linear effects strongly depend on the sample and its orientation. We also investigated a relevance of ponderomotive energy concept for strong THz field interactions, and concluded that the magnitude of the electric field is probably more relevant quantity for description of the new spectra generation in case of the strong-field interactions.

Journal article