Terahertz radiation-induced sub-cycle field electron emission across a split-gap dipole antenna

Published

Journal Article

© 2015 AIP Publishing LLC. We use intense terahertz pulses to excite the resonant mode (0.6 THz) of a micro-fabricated dipole antenna with a vacuum gap. The dipole antenna structure enhances the peak amplitude of the in-gap THz electric field by a factor of ∼170. Above an in-gap E-field threshold amplitude of ∼10 MV/cm -1 , THz-induced field electron emission is observed as indicated by the field-induced electric current across the dipole antenna gap. Field emission occurs within a fraction of the driving THz period. Our analysis of the current (I) and incident electric field (E) is in agreement with a Millikan-Lauritsen analysis where log (I) exhibits a linear dependence on 1/E. Numerical estimates indicate that the electrons are accelerated to a value of approximately one tenth of the speed of light.

Full Text

Cited Authors

  • Zhang, J; Zhao, X; Fan, K; Wang, X; Zhang, GF; Geng, K; Zhang, X; Averitt, RD

Published Date

  • December 7, 2015

Published In

Volume / Issue

  • 107 / 23

International Standard Serial Number (ISSN)

  • 0003-6951

Digital Object Identifier (DOI)

  • 10.1063/1.4936841

Citation Source

  • Scopus