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

W. Sha, J.-K. Rhee, T. B. Norris, W. J. Schaff, IEEE J. Quantum Electron. 28, 2445 (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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