Abstract

We investigate the possibility that Stark wave packets can be used as a source of shaped terahertz radiation. Calculations for the sodium atom reveal that the frequency and intensity of the THz emission can be controlled over a broad range by varying the parameters of the excitation pulse.

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References

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  1. T.F. Gallagher, Rydberg Atoms, (Cambridge University Press, Cambridge, 1994).
    [CrossRef]
  2. A. ten Wolde, L.D. Noordam, A. Lagendijk, and H.B. van Linden van den Huevell, "Atomic electron wave packets in an electrical field," Phys. Rev. A 40, 485-488 (1989).
    [CrossRef] [PubMed]
  3. Z.D. Gaeta, M.W. Noel, and C.R. Stroud, Jr., "Excitation of the classical-limit state of an atom," Phys. Rev. Lett. 73, 636-639 (1994).
    [CrossRef] [PubMed]
  4. J.N. Bardsley, "Pseudopotentials in atomic and molecular physics," in Case Studies in Atomic Physics, edited by E.W. McDaniel and M.R.C. McDowell, (North Holland, Amsterdam, 1975), vol. IV, pp. 302-368.
  5. P.C.M. Planken, M.C. Nuss, I. Brener, K.W. Goossen, M.S.C. Luo, S.L. Chuang, and L. Pfeier, "Terahertz emission in single quantum wells after coherent optical excitation of light hole and heavy hole excitons," Phys. Rev. Lett. 69, 3800-3803 (1992).
    [CrossRef] [PubMed]
  6. B.B. Hu and M.C. Nuss, "Imaging with terahertz waves," Opt. Lett. 20, 1716-1719 (1995).
    [CrossRef] [PubMed]
  7. P.C.M. Planken, I. Brener, M.C. Nuss, M.S.C. Luo, and S.L. Chuang "Coherent control of terahertz charge oscillations in a coupled quantum well using phase-locked optical pulses," Phys. Rev. B 48, 4903-4906 (1993).
    [CrossRef]
  8. A.M. Weiner, "Enhancement of coherent charge oscillations in coupled quantum wells by femtosecond pulse shaping," J. Opt. Soc. Am. B 11, 2480-2491 (1994).
    [CrossRef]
  9. B.B. Hu, E.A. de Souza, W.H. Knox, J.E. Cunningham, and M.C. Nuss, "Identifying the distinct phases of carrier transport in semiconductors with 10 fs resolution," Phys. Rev. Lett. 74, 1689-1692 (1995).
    [CrossRef] [PubMed]

Other

T.F. Gallagher, Rydberg Atoms, (Cambridge University Press, Cambridge, 1994).
[CrossRef]

A. ten Wolde, L.D. Noordam, A. Lagendijk, and H.B. van Linden van den Huevell, "Atomic electron wave packets in an electrical field," Phys. Rev. A 40, 485-488 (1989).
[CrossRef] [PubMed]

Z.D. Gaeta, M.W. Noel, and C.R. Stroud, Jr., "Excitation of the classical-limit state of an atom," Phys. Rev. Lett. 73, 636-639 (1994).
[CrossRef] [PubMed]

J.N. Bardsley, "Pseudopotentials in atomic and molecular physics," in Case Studies in Atomic Physics, edited by E.W. McDaniel and M.R.C. McDowell, (North Holland, Amsterdam, 1975), vol. IV, pp. 302-368.

P.C.M. Planken, M.C. Nuss, I. Brener, K.W. Goossen, M.S.C. Luo, S.L. Chuang, and L. Pfeier, "Terahertz emission in single quantum wells after coherent optical excitation of light hole and heavy hole excitons," Phys. Rev. Lett. 69, 3800-3803 (1992).
[CrossRef] [PubMed]

B.B. Hu and M.C. Nuss, "Imaging with terahertz waves," Opt. Lett. 20, 1716-1719 (1995).
[CrossRef] [PubMed]

P.C.M. Planken, I. Brener, M.C. Nuss, M.S.C. Luo, and S.L. Chuang "Coherent control of terahertz charge oscillations in a coupled quantum well using phase-locked optical pulses," Phys. Rev. B 48, 4903-4906 (1993).
[CrossRef]

A.M. Weiner, "Enhancement of coherent charge oscillations in coupled quantum wells by femtosecond pulse shaping," J. Opt. Soc. Am. B 11, 2480-2491 (1994).
[CrossRef]

B.B. Hu, E.A. de Souza, W.H. Knox, J.E. Cunningham, and M.C. Nuss, "Identifying the distinct phases of carrier transport in semiconductors with 10 fs resolution," Phys. Rev. Lett. 74, 1689-1692 (1995).
[CrossRef] [PubMed]

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Figures (4)

Fig. 1.
Fig. 1.

Snapshot of a Stark wave packet.

Fig. 2.
Fig. 2.

Time dependent dipole (left) and THz signal (right).

Fig. 3.
Fig. 3.

THz spectra for two different excitation pulses. The central frequency ω 0 and bandwidth Δω are given in cm-1.

Fig. 4.
Fig. 4.

THz production as a function of center frequency and DC bias field. The bandwidth of the excitation pulse is 24 cm-1.

Equations (2)

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z ( t ) THz = k , k Ω ik Ω k i ϵ ˜ * ( ω k ) ϵ ˜ ( ω k ) Z k . k e i ω k , k t ,
a ( ω ) 2 = k , k P k P k Z k . k 2 ω k , k 4 δ ( ω ω k , k ) ,

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