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  • 1990-1994  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Transient velocity overshoot dynamics in GaAs for electric fields ≤ 200 kV/cm (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 923-925 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have experimentally studied the transient velocity overshoot dynamics of photoexcited carriers in GaAs for electric fields as great as 200 kV/cm. Time domain waveforms proportional to the velocity and the acceleration of carriers have been acquired, respectively, from guided and free-space radiating signals which contain terahertz frequency components. The measurements demonstrated that the degree of overshoot was maximized for an electric field on the GaAs between 40 and 50 kV/cm when 1.44-eV photons in an 80-fs laser pulse excited the sample. For carriers excited with higher initial energy (1.55 eV), the degree of overshoot decreased and the maximum degree of overshoot occurred at a higher electric field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.109846
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  • 2
    Digitale Medien
    Digitale Medien
    New coherent detector for terahertz radiation based on excitonic electroabsorption (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1763-1765 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We demonstrate a new technique for the coherent measurement of free-space THz electrical transients, based on the parallel-field excitonic electroabsorption effect in GaAs quantum wells. A THz transient generated from a photoconductive dipole antenna is measured with a rise time of 290 fs and a full width at half maximum of 360 fs. The initial rise of the THz wave form is abrupt, and does not display the exponential leading edge apparent in waveforms measured with photoconductive techniques. The detector sensitivity is sub-100 mV/cm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.108419
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