Finite-range time delays in numerical attosecond-streaking experiments

We present results of numerical simulations and theoretical classical analysis of time delays with respect to the instant of ionization in a numerical streaking experiment. We show that the time delay is related to a finite range in space, which the emitted electron probes after its transition into the continuum until the streaking pulse ceases. This finite-range time delay results from the coupling of the atomic potential and the streaking field and strongly depends on the parameters, in particular the duration, of the streaking field. It can be represented as an integral or sum over piecewise field-free time delays weighted by the ratio of the instantaneous streaking field strength relative to the field strength at the instant of ionization.