High Visibility in Two-Color Above-Threshold Photoemission from Tungsten Nanotips in a Coherent Control Scheme

Abstract

In this article we present coherent control of above-threshold photoemission from a tungsten nanotip achieving nearly perfect modulation. Depending on the pulse delay between fundamental (1560 nm) and second harmonic (780 nm) pulses of a femtosecond fiber laser at the nanotip, electron emission is significantly enhanced or depressed during temporal overlap. Electron emission is studied as a function of pulse delay, optical near-field intensities, DC bias field, and final photoelectron energy. Under optimized conditions modulation amplitudes of the electron emission of 97.5% are achieved. Experimental observations are discussed in the framework of quantum- pathway interference supported by local density of states (LDOS) simulations.

arXiv comment9 pages, 6 figures

References in corpus (9)

• Attosecond control of electrons emitted from a nanoscale metal tip
• A Femtosecond Nanometer Free Electron Source
• Field-free orientation of CO molecules by femtosecond two-color laser fields
• Strong-field above-threshold photoemission from sharp metal tips
• Carrier-envelope phase effects on the strong-field photoemission of electrons from metallic nanostructures
• Highly coherent electron beam from a laser-triggered tungsten needle tip
• A nanofocused plasmon-driven sub-10 femtosecond electron point source
• Optical Control of Field-Emission Sites by Femtosecond Laser Pulses
• A tip-based source of femtosecond electron pulses at 30keV

Cited by in corpus (4)

• High-order above-threshold photoemission from nanotips controlled with two-color laser fields
• Quantum interference visibility spectroscopy in two-color photoemission from tungsten needle tips
• Two-color coherent control in photoemission from gold needle tips
• Ultrafast optically induced tunneling in narrow metallic gaps from the time dependent density functional perspective