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Optics Letters

Optics Letters


  • Vol. 25, Iss. 1 — Jan. 1, 2000
  • pp: 13–15

Photoexcited GaAs surfaces studied by transient terahertz time-domain spectroscopy

Michael Schall and Peter Uhd Jepsen  »View Author Affiliations

Optics Letters, Vol. 25, Issue 1, pp. 13-15 (2000)

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The transmission characteristics of an air–GaAs interface and the transient absorption and index spectra of the thin, photoexcited surface layer are investigated subsequent to excitation by a femtosecond laser pulse. We find that the total phase change and transmission of a terahertz (THz) probe pulse are dominated by interface effects. This observation has important implications in the interpretation of THz time-domain spectroscopy data of absorbing media. We also observe that the THz pulse apparently arrives at the detector as much as 60 fs earlier when it is transmitted through an optically excited GaAs wafer. This effect is fully explained in terms of a frequency-dependent transmission and phase shift at the air–GaAs interface and is not associated with superluminal propagation.

© 2000 Optical Society of America

OCIS Codes
(160.5140) Materials : Photoconductive materials
(260.2030) Physical optics : Dispersion
(300.6270) Spectroscopy : Spectroscopy, far infrared
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(310.6860) Thin films : Thin films, optical properties
(320.7100) Ultrafast optics : Ultrafast measurements

Michael Schall and Peter Uhd Jepsen, "Photoexcited GaAs surfaces studied by transient terahertz time-domain spectroscopy," Opt. Lett. 25, 13-15 (2000)

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