Transient Work Function Gating: A New Photoemission Regime
Abstract
We present the theoretical basis for a new photoemission regime, transient work function gating (TWFG), that temporally and energetically gates photoemission and produces near-threshold photoelectrons with thermally limited emittance, percent-level quantum efficiency, and control over temporal coherence. The technique consists of actively gating the work function of a generalized photocathode using non-ionizing long-wavelength optical field to produce an adiabatic modulation of the carrier density at their surface. We examine TWFG as a means to circumvent the long-standing trade-off between low emittance and high quantum efficiency, untethered to particle source or photocathode specifics. TWFG promises new opportunities in photoemission physics for next generation electron and accelerator-based x-ray photon sources.
Cite
@article{arxiv.2006.01950,
title = {Transient Work Function Gating: A New Photoemission Regime},
author = {Sergio Carbajo},
journal= {arXiv preprint arXiv:2006.01950},
year = {2020}
}