Attosecond photoemission delay in the inhomogeneous field

We investigate the photoemission process of the hydrogen atom in a spatial-dependent infrared (IR) field. The results show that the inhomogeneous field induces an additional contribution to the photoemission time delay, which results in the increase (decrease) of the photoemission time delay due to the enhancement (decay) of the IR field intensity in space when compared to the case in the homogeneous field. Based on the photoemission time delay in the inhomogeneous field, we demonstrate a method to extract the inhomogeneous parameter that is vital for characterizing the spatial distribution of IR field. The proposed method might pave an accessible route toward describing the plasmon-enhanced fields in the vicinity of a nanostructure. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The study investigates the photoemission process of the hydrogen atom in a spatial-dependent infrared field, revealing that the inhomogeneous field induces an additional influence on the photoemission time delay. A method is demonstrated to extract the crucial parameter characterizing the spatial distribution of the IR field based on the photoemission time delay in the inhomogeneous field, potentially providing a pathway towards describing plasmon-enhanced fields near a nanostructure.