Abstract

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

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References

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  1. D. Grischkowsky, S. Keiding, M. van Exter, and Ch. Fattinger, J. Opt. Soc. Am. B 7, 2006 (1990).
    [CrossRef]
  2. L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).
  3. T.-I. Jeon and D. Grischkowsky, Appl. Phys. Lett. 72, 3032 (1998).
    [CrossRef]
  4. P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
    [CrossRef]
  5. R. H. M. Groeneveld and D. Grischkowsky, J. Opt. Soc. Am. B 11, 2502 (1994).
    [CrossRef]
  6. J. Zielbauer and M. Wegener, Appl. Phys. Lett. 68, 1223 (1996).
    [CrossRef]
  7. R. McElroy and K. Wynne, Phys. Rev. Lett. 79, 3078 (1997).
    [CrossRef]
  8. M. Born and E. Wolf, Principles of Optics, 7th ed. (Cambridge U. Press, Cambridge, 1999).
    [CrossRef]
  9. S. R. Keiding and D. Grischkowsky, Opt. Lett. 15, 48 (1990).
    [CrossRef] [PubMed]
  10. K. Wynne and D. A. Jaroszynski, Opt. Lett. 24, 25 (1999).
    [CrossRef]
  11. W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes in Pascal (Cambridge U. Press, Cambridge, 1990).

1999 (1)

1998 (1)

T.-I. Jeon and D. Grischkowsky, Appl. Phys. Lett. 72, 3032 (1998).
[CrossRef]

1997 (1)

R. McElroy and K. Wynne, Phys. Rev. Lett. 79, 3078 (1997).
[CrossRef]

1996 (1)

J. Zielbauer and M. Wegener, Appl. Phys. Lett. 68, 1223 (1996).
[CrossRef]

1995 (1)

L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).

1994 (1)

1992 (1)

P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
[CrossRef]

1990 (2)

Born, M.

M. Born and E. Wolf, Principles of Optics, 7th ed. (Cambridge U. Press, Cambridge, 1999).
[CrossRef]

Dykaar, D. R.

P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
[CrossRef]

Fattinger, Ch.

Federici, J. F.

P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
[CrossRef]

Flannery, B. P.

W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes in Pascal (Cambridge U. Press, Cambridge, 1990).

Greene, B. I.

P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
[CrossRef]

Grischkowsky, D.

Groeneveld, R. H. M.

Jacobsen, R. H.

L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).

Jaroszynski, D. A.

Jeon, T.-I.

T.-I. Jeon and D. Grischkowsky, Appl. Phys. Lett. 72, 3032 (1998).
[CrossRef]

Jepsen, P. Uhd

L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).

Keiding, S.

Keiding, S. R.

L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).

S. R. Keiding and D. Grischkowsky, Opt. Lett. 15, 48 (1990).
[CrossRef] [PubMed]

McElroy, R.

R. McElroy and K. Wynne, Phys. Rev. Lett. 79, 3078 (1997).
[CrossRef]

Press, W. H.

W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes in Pascal (Cambridge U. Press, Cambridge, 1990).

Saeta, P. N.

P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
[CrossRef]

Teukolsky, S. A.

W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes in Pascal (Cambridge U. Press, Cambridge, 1990).

Thrane, L.

L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).

van Exter, M.

Vetterling, W. T.

W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes in Pascal (Cambridge U. Press, Cambridge, 1990).

Wegener, M.

J. Zielbauer and M. Wegener, Appl. Phys. Lett. 68, 1223 (1996).
[CrossRef]

Wolf, E.

M. Born and E. Wolf, Principles of Optics, 7th ed. (Cambridge U. Press, Cambridge, 1999).
[CrossRef]

Wynne, K.

K. Wynne and D. A. Jaroszynski, Opt. Lett. 24, 25 (1999).
[CrossRef]

R. McElroy and K. Wynne, Phys. Rev. Lett. 79, 3078 (1997).
[CrossRef]

Zielbauer, J.

J. Zielbauer and M. Wegener, Appl. Phys. Lett. 68, 1223 (1996).
[CrossRef]

Appl. Phys. Lett. (3)

T.-I. Jeon and D. Grischkowsky, Appl. Phys. Lett. 72, 3032 (1998).
[CrossRef]

P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992).
[CrossRef]

J. Zielbauer and M. Wegener, Appl. Phys. Lett. 68, 1223 (1996).
[CrossRef]

Chem. Phys. Lett. (1)

L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, Chem. Phys. Lett. 240, 330 (1995).

J. Opt. Soc. Am. B (2)

Opt. Lett. (2)

Phys. Rev. Lett. (1)

R. McElroy and K. Wynne, Phys. Rev. Lett. 79, 3078 (1997).
[CrossRef]

Other (2)

M. Born and E. Wolf, Principles of Optics, 7th ed. (Cambridge U. Press, Cambridge, 1999).
[CrossRef]

W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes in Pascal (Cambridge U. Press, Cambridge, 1990).

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Figures (2)

Fig. 1
Fig. 1

(a) Experimental and numerical propagation of a THz pulse through photoexcited GaAs. (b) Model transmission coefficient and phase shift. (c) Absorption coefficient and refractive index.

Fig. 2
Fig. 2

Experimental results. (a) Transient absorption coefficient and refractive index. (b) Transmission coefficient. (c) Phase shift with respect to an unexcited sample.

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

t12=21+n2+αfc/ω21/2,
tan χ12=-αfcω1+n,
EωEω=t12t2t12expiχ12+χ2-χ2,
tmω=1+n0exp-αfL1+n0+Δn2+αfc/ω21/2,
ϕmω=ωΔnLc+arctan-αfc/ω1+n0+Δn,

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