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Generation of longitudinally polarized terahertz pulses with field amplitudes exceeding 2 kV/cm

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Article number191112
<mark>Journal publication date</mark>2014
<mark>Journal</mark>Applied Physics Letters
Issue number19
Volume105
Number of pages4
Publication StatusPublished
Early online date12/11/14
<mark>Original language</mark>English

Abstract

We demonstrate the generation of near-single cycle longitudinally polarized terahertz radiation
using a large-area radially biased photoconductive antenna with a longitudinal field amplitude in
excess of 2 kV/cm. The 76 mm diameter antenna was photo-excited by a 0.5 mJ amplified nearinfrared
femtosecond laser system and biased with a voltage of up to 100 kV applied over concentric
electrodes. Amplitudes for both the transverse and longitudinal field components of the source
were measured using a calibrated electro-optic detection scheme. By tightly focusing the radiation
emitted from the photoconductive antenna, we obtained a maximum longitudinal field amplitude of
2.22 kV/cm with an applied bias field of 38.5 kV/cm.