Abstract
Abstract We demonstrate coherent control in photoemission from a gold needle tip using an ω − 2ω field composed of strong few-cycle laser pulses with a nearfield intensity of ∼4 TW/cm2. We obtain the nearfield intensity from electron energy spectra, showing the tell-tale plateau of field-driven electron rescattering at the metal surface induced by the fundamental field. Changing the relative phase between the fundamental field centered at 1560 nm and its second harmonic modulates the total emitted photocurrent with visibilities of up to 80% despite the strong and broadband excitation of the plasmonic material. Our work combines a two-color coherent control scheme and strong-field physics enabled by a nanoplasmonic emitter.
Highlights
We demonstrate coherent control in photoemission from a gold needle tip using an ω − 2ω field composed of strong few-cycle laser pulses with a nearfield intensity of ∼ 4 TW/cm2
Our work combines a two-color coherent control scheme and strong-field physics enabled by a nanoplasmonic emitter
Plasmonics gained more and more interest in the realm of strong-field physics as field-driven phenomena such as high-harmonic generation (HHG), attosecond pulse generation, and electron rescattering were explored for dielectrics and metals [5,6,7,8,9]
Summary
Abstract: We demonstrate coherent control in photoemission from a gold needle tip using an ω − 2ω field composed of strong few-cycle laser pulses with a nearfield intensity of ∼ 4 TW/cm2. Changing the relative phase between the fundamental field centered at 1560 nm and its second harmonic modulates the total emitted photocurrent with visibilities of up to 80% despite the strong and broadband excitation of the plasmonic material. *Corresponding author: Philip Dienstbier, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstraße 1, Erlangen 91058, Germany, E-mail: philip.pd.dienstbier@studium.uni-erlangen.de.
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