Two-color coherent control in photoemission from gold needle tips
arXiv:2105.05577 · doi:10.1088/1361-6455/ac0294
Abstract
We demonstrate coherent control of photoemission from a gold needle tip using a two-color laser field. The relative phase between a fundamental field and its second harmonic imprints a strong modulation on the emitted photocurrent with up to 96.5 % contrast. The contrast as a function of the second harmonic intensity can be described by three interfering quantum pathways. Increasing the bias voltage applied to the tip reduces the maximum achievable contrast and modifies the weights of the involved pathways. Simulations based on the time-dependent Schrödinger equation reproduce the characteristic cooperative signal and its dependence on the second harmonic intensity, which further confirms the involvement of three emission pathways.
References in corpus (10)
- Intense Super-radiant X-rays from a Compact Source using a Nanocathode Array and Emittance Exchange
- A nanofocused plasmon-driven sub-10 femtosecond electron point source
- Optical Control of Field-Emission Sites by Femtosecond Laser Pulses
- Two-Color Strong-Field Photoelectron Spectroscopy and the Phase of the Phase
- Two-color coherent control of femtosecond above-threshold photoemission from a tungsten nanotip
- Probing of optical near-fields by electron rescattering on the 1 nm scale
- Large optical field enhancement for nanotips with large opening angles
- High-order above-threshold photoemission from nanotips controlled with two-color laser fields
- High Visibility in Two-Color Above-Threshold Photoemission from Tungsten Nanotips in a Coherent Control Scheme
- Quantum interference visibility spectroscopy in two-color photoemission from tungsten needle tips