journal article·2004-04-01

Emission of collimated THz pulses from photo-excited semiconductors

Michael B Johnston, Annette Dowd, Robert Driver, Edmund H Linfield, A Giles Davies, David M Whittaker

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Abstract

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. (Some figures in this article are in colour only in the electronic version) 1.
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Research context

OpenAlex topics: Terahertz technology and applications · Spectroscopy and Laser Applications · Semiconductor Quantum Structures and Devices

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