Nonequilibrium model of ultrafast laser-induced electron photofield emission from a dc-biased metallic surface

L. Wu and L. K. Ang
Phys. Rev. B 78, 224112 – Published 31 December 2008

Abstract

This paper proposes a nonequilibrium model to describe the ultrafast laser-excited electron photofield emission from a metallic surface with an applied dc voltage. Using a microscopic kinetic approach based on Boltzmann’s equation, we determine the nonequilibrium electron distribution due to the ultrafast laser excitation on metal and calculate the time dependence of the emitted electron charges and current density. Our calculation is able to explain the prior experimental observations without using the optical-field emission, which was disputed among the experiments. Inconsistency of the prior models used to explain the experimental results is discussed.

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  • Received 10 October 2008

DOI:https://doi.org/10.1103/PhysRevB.78.224112

©2008 American Physical Society

Authors & Affiliations

L. Wu and L. K. Ang*

  • School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore

  • *Author to whom correspondence should be addressed; elkang@ntu.edu.sg

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Vol. 78, Iss. 22 — 1 December 2008

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