Browsing 02 Physical Sciences by Author "Davies A."

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Browsing 02 Physical Sciences by Author "Davies A."

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  • Emission of collimated THz pulses from photoexcited semiconductors 
    Johnston Michael; Dowd Annette; Driver Robert; Linfield Edmund; Davies A.; Whittaker David (Institute of Physics Publishing, 2004)
    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 carri ...
  • Generation of highpower terahertz pulses in a prism 
    Johnston Michael; Whittaker David; Dowd Annette; Davies A.; Linfield Edmund; Li X; Ritchie D (Optical Society of America, 2002)
    A compact, high-power emitter of half-cycle terahertz (THz) radiation is demonstrated. The device consists of an epitaxial InAs emitter upon a GaAs prism and produces THz pulses that are 20 times more powerful than those ...
  • Magnetic-field-induced enhancement of terahertz emission from III-V semiconductor surfaces 
    Johnston Michael; Corchia A; Dowd Annette; Linfield Edmund; Davies A.; Mclaughlin Robert; Arnone Don; Pepper Michael (Elsevier, 2002)
    We discuss the origins of the magnetic-field-induced enhancement of terahertz (THz) emission from bulk semiconductor surfaces. The principal effect of the magnetic field is to rotate the THz dipole and hence dramatically ...