Simultaneous control of harmonic yield and energy cutoff of high-harmonic generation using seeded plasmonic-enhanced fields

TL;DR

This paper demonstrates that combining seeded XUV pulses with plasmonic-enhanced fields in high-harmonic generation can simultaneously extend the harmonic cutoff and improve efficiency, enabling the production of intense, broad attosecond pulses.

Contribution

It introduces a novel approach of mixing seeded XUV pulses with plasmonic-enhanced fields to control both the harmonic cutoff and yield in HHG.

Findings

Simultaneous extension of HHG cutoff and increase in harmonic flux.

Potential for generating intense, broad attosecond pulse trains.

Enhanced control over HHG spectral and efficiency properties.

Abstract

We study high-order harmonic generation (HHG) driven by seeded plasmonic-enhanced fields. On one hand, plasmonic-enhanced fields have shown a great potential to extend the HHG cutoff, an instrumental pre-requisite for the generation of attosecond pulses. On another hand, the use of XUV seeds appears to have a considerable potential to improve the HHG conversion efficiency, which is typically modest when a unique fundamental laser pulse is employed. By mixing these two sources, we show it is possible to, simultaneously, boost the HHG cutoff and to increase the harmonic photon flux. The combination of these features potentially enables to generate intense and spectrally broad attosecond pulse trains.