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Publication Detail
Near-field analysis of terahertz pulse generation from photo-excited charge density gradients
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Mueckstein R, Natrella M, Hatem O, Freeman JR, Graham CS, Renaud CC, Seeds AJ, Linfield EH, Davies AG, Cannard PJ, Robertson MJ, Moodie DG, Mitrofanov O
  • Publisher:
    IEEE Microwave Theory and Techniques Society
  • Publication date:
  • Pagination:
    260, 267
  • Journal:
    IEEE Transactions on Terahertz Science and Technology
  • Volume:
  • Issue:
  • Print ISSN:
  • Language:
  • Keywords:
    Aperture, Dember effect, emission pattern, far-field radiation pattern, near-field microscopy, near-field radiation, pulse generation, terahertz
Excitation of photo-current transients at semiconductor surfaces by subpicosecond optical pulses gives rise to emission of electromagnetic pulses of terahertz (THz) frequency radiation. To correlate the THz emission with the photo-excited charge density distribution and the photo-current direction, we mapped near-field and far-field distributions of the generated THz waves from GaAs and Fe-doped InGaAs surfaces. The experimental results show that the charge dynamics in the plane of the surface can radiate substantially stronger THz pulses than the charge dynamics in the direction normal to the surface, which is generally regarded as the dominant origin of the emission.
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