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Emission of collimated THz pulses from photo-excited semiconductors

Michael B Johnston1, Annette Dowd2,5, Robert Driver2, Edmund H Linfield2, A Giles Davies3 and David M Whittaker4

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It is shown experimentally that surface-field terahertz (THz) emitters can produce well-collimated beams of THz radiation, making them useful devices for time-domain spectroscopy applications. Simulations of the carrier-dynamics are used to explain the mechanism of THz generation in InAs and GaAs, and it is shown that inter-valley scattering of electrons must be considered in order to fully describe THz emission from InAs.


PACS

79.70.+q Field emission, ionization, evaporation, and desorption

85.30.-z Semiconductor devices

Subjects

Electronics and devices

Condensed matter: electrical, magnetic and optical

Semiconductors

Dates

Issue 4 (April 2004)

Received 28 July 2003

Published 15 March 2004



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