Abstract

AbstractThe sampling of petahertz light fields opens up a new regime for field-resolved spectroscopy of ultrafast light-matter interactions. We derived a theoretical model tested against systematic experimental studies on the emergence of macroscopic currents in photoconductive field sampling. The model overcomes previous heuristic interpretations and can aid in the design of more sensitive and more efficient photoconductive devices. Furthermore, we implemented a near-field method for the spatio-temporal sampling of near-petahertz fields, enabling full vectorial field characterization of light beams with orbital angular momentum.

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