Abstract

We include screening of the bias field by the space charge induced by carrier transport and by the generated terahertz radiation in a model describing the far-field electromagnetic radiation from a large-aperture biased photoconductor triggered by an ultrashort optical pulse. At high fluences, space-charge screening is shown to produce bipolar terahertz waveforms. However, the dominant saturation mechanism is screening of the bias field by the radiated terahertz field.

© 1996 Optical Society of America

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  1. J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
    [CrossRef]
  2. D. You, R. R. Jones, D. R. Dykaar, P. H. Bucksbaum, Opt. Lett. 18, 290 (1993).
    [CrossRef] [PubMed]
  3. P. K. Benicewicz, A. J. Taylor, Opt. Lett. 18, 1332 (1993).
    [CrossRef] [PubMed]
  4. A. J. Taylor, P. K. Benicewicz, S. M. Young, Opt. Lett. 18, 1340 (1993).
    [CrossRef] [PubMed]
  5. A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
    [CrossRef]
  6. T. Dekorsky, T. Pfeifer, W. Kutt, H. Kurz, Phys. Rev. B 47, 3842 (1993).
    [CrossRef]
  7. R. P. Joshi, A. N. Dharamsi, J. Appl. Phys. 74, 3215 (1993).
    [CrossRef]
  8. G. Rodriguez, S. R. Caceres, A. J. Taylor, Opt. Lett. 19, 1994 (1994).
    [CrossRef] [PubMed]
  9. J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
    [CrossRef]
  10. W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
    [CrossRef]

1994 (1)

1993 (5)

1992 (3)

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
[CrossRef]

J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
[CrossRef]

1988 (1)

A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
[CrossRef]

Auston, D. H.

J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
[CrossRef]

Benicewicz, P. K.

Bucksbaum, P. H.

Caceres, S. R.

Darrow, J. T.

J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
[CrossRef]

Dekorsky, T.

T. Dekorsky, T. Pfeifer, W. Kutt, H. Kurz, Phys. Rev. B 47, 3842 (1993).
[CrossRef]

Dharamsi, A. N.

R. P. Joshi, A. N. Dharamsi, J. Appl. Phys. 74, 3215 (1993).
[CrossRef]

Dykaar, D. R.

Hvam, J. M.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Iverson, A. E.

A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
[CrossRef]

Jepsen, P. U.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Jones, R. R.

Joshi, R. P.

R. P. Joshi, A. N. Dharamsi, J. Appl. Phys. 74, 3215 (1993).
[CrossRef]

Keiding, S. R.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Kurz, H.

T. Dekorsky, T. Pfeifer, W. Kutt, H. Kurz, Phys. Rev. B 47, 3842 (1993).
[CrossRef]

Kutt, W.

T. Dekorsky, T. Pfeifer, W. Kutt, H. Kurz, Phys. Rev. B 47, 3842 (1993).
[CrossRef]

Lindelof, P. E.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Lyssenko, V. G.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Morse, J. D.

J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
[CrossRef]

Norris, T. B.

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
[CrossRef]

Pedersen, J. E.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Pfeifer, T.

T. Dekorsky, T. Pfeifer, W. Kutt, H. Kurz, Phys. Rev. B 47, 3842 (1993).
[CrossRef]

Redondo, A.

A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
[CrossRef]

Rhee, J.-K.

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
[CrossRef]

Rodriguez, G.

Schaff, W. J.

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
[CrossRef]

Sha, W.

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
[CrossRef]

Smith, D. L.

A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
[CrossRef]

Sorensen, C. B.

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

Taylor, A. J.

Wysin, G. M.

A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
[CrossRef]

You, D.

Young, S. M.

Zhang, X.-C.

J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
[CrossRef]

Appl. Phys. Lett. (2)

A. E. Iverson, G. M. Wysin, D. L. Smith, A. Redondo, Appl. Phys. Lett. 52, 2148 (1988).
[CrossRef]

J. E. Pedersen, V. G. Lyssenko, J. M. Hvam, P. U. Jepsen, S. R. Keiding, C. B. Sorensen, P. E. Lindelof, Appl. Phys. Lett. 62, 1265 (1992).
[CrossRef]

IEEE J. Quantum Electron (2)

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (1992).
[CrossRef]

J. T. Darrow, X.-C. Zhang, D. H. Auston, J. D. Morse, IEEE J. Quantum Electron. 28, 2291 (1992).
[CrossRef]

J. Appl. Phys. (1)

R. P. Joshi, A. N. Dharamsi, J. Appl. Phys. 74, 3215 (1993).
[CrossRef]

Opt. Lett. (4)

Phys. Rev. B (1)

T. Dekorsky, T. Pfeifer, W. Kutt, H. Kurz, Phys. Rev. B 47, 3842 (1993).
[CrossRef]

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Figures (2)

Fig. 1
Fig. 1

Convolved waveforms Er(t)/A versus time calculated from our model for 1.5-eV excitation in GaAs with μn = 3000 cm2/(V s) and an initial bias of 2.5 kV/cm, for gap spacings of (a) 0.3 mm, (b) 1 mm, and (c) 5 mm.

Fig. 2
Fig. 2

Er, peak/A versus F for 5-, 1-, and 0.3-mm-gap emitters (filled circles) and for a 0.3-mm-gap emitter calculated without terahertz screening but with space-charge screening (filled squares). Inset: Er, peak/A versus F convolved with a 1-ps-response Gaussian function for 5-mm (topmost curve), 1-mm (middle curve), and 0.3-mm-gap (lowest curve) emitters.

Equations (4)

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E r ( z , t ) = L y 4 π ɛ 0 c 2 z d d t J ( x , t ) d x ,
n , p t = I opt ( x , t ) ( 1 R ) h ν ± 1 e J n , p x ,
J n = e μ n E ( x , t ) n ( x , t ) 1 + e μ n n ( x , t ) η 0 1 + n dc ,
E ( x , t ) x = e l ɛ [ p ( x , t ) n ( x , t ) ] ,

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