期刊
APPLIED PHYSICS LETTERS
卷 107, 期 23, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4936841
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资金
- DOE-Basic Energy Sciences [DE-FG02-09ER46643]
- National Science Foundation [ECCS-1309835]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1309835] Funding Source: National Science Foundation
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 similar to 170. Above an in-gap E-field threshold amplitude of similar to 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. (C) 2015 AIP Publishing LLC.
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