Wavelength-Dependent Features of Photoelectron Spectra from Nanotip Photoemission

Xiao-Yuan Wu, Hao Liang, Marcelo F. Ciappina, Liang-You Peng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

If a metal nanotip is irradiated with the light of a wavelength much larger than the nanotip’s radius of curvature, optical near-fields become excited. These fields are responsible for distinct strong-field electron dynamics, due to both the field enhancement and spatial localization. By classical trajectory, Monte Carlo (CTMC) simulation, and the integration of the time-dependent Schrödinger equation (TDSE), we find that the photoelectron spectra for nanotip strong-field photoemission, irradiated by mid-infrared laser pulses, present distinctive wavelength-dependent features, especially in the mid- to high-electron energy regions, which are different from the well known ones. By extracting the electron trajectories from the CTMC simulation, we investigate these particular wavelength-dependent features. Our theoretical results contribute to understanding the photoemission and electron dynamics at nanostructures, and pave new pathways for designing high-energy nanometer-sized ultrafast electron sources.
Original languageEnglish
JournalPhotonics
DOIs
StatePublished - 11 Dec 2020

Keywords

  • photoemission
  • energy spectra
  • wavelength-dependent
  • nanostructures

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