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

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{sup −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.
Authors:
;  [1] ;  [2] ; ; ; ;  [3] ;  [1] ;  [4]
  1. Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)
  2. (United States)
  3. Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215 (United States)
  4. Department of Physics, Boston University, Boston, Massachusetts 02215 (United States)
Publication Date:
OSTI Identifier:
22486172
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; ANTENNAS; DIPOLES; ELECTRIC CURRENTS; ELECTRIC FIELDS; ELECTRON EMISSION; FIELD EMISSION; PULSES