Abstract

We report on Z-scan measurements of the spectral dependence of dye-induced enhancement of optical torque in nematic liquid crystals. It is found that the enhancement factor changes sign from positive to negative as photon energy increases from 2.4 to 2.7 eV. Modification of our earlier model is proposed to describe the observed spectral dependence.

© 1995 Optical Society of America

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References

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  1. I. Jánossy, A. D. Lloyd, Mol. Cryst. Liq. Cryst. 203, 77 (1991); I. Jánossy, L. Csillag, A. D. Lloyd, Phys. Rev. A 44, 8410 (1991).
    [CrossRef] [PubMed]
  2. A. S. Zolotko, V. F Kitaeva, D. B. Terskov, Sov. Phys. JETP 106, 1722 (1994).
  3. I. C. Khoo, H. Li, Y. Liang, IEEE J. Quantum Electron. 29, 1444 (1993); H. Li, Y. Liang, I. C. Khoo, Mol. Cryst. Liq. Cryst. 251, 85 (1994).
    [CrossRef]
  4. I. Jánossy, T. Kósa, Opt. Lett. 17, 1183 (1992).
    [CrossRef] [PubMed]
  5. I. Jánossy, Phys. Rev. E 49, 2957 (1994).
    [CrossRef]
  6. D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
    [CrossRef]
  7. M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
    [CrossRef]

1994 (3)

A. S. Zolotko, V. F Kitaeva, D. B. Terskov, Sov. Phys. JETP 106, 1722 (1994).

I. Jánossy, Phys. Rev. E 49, 2957 (1994).
[CrossRef]

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

1993 (1)

I. C. Khoo, H. Li, Y. Liang, IEEE J. Quantum Electron. 29, 1444 (1993); H. Li, Y. Liang, I. C. Khoo, Mol. Cryst. Liq. Cryst. 251, 85 (1994).
[CrossRef]

1992 (1)

1991 (1)

I. Jánossy, A. D. Lloyd, Mol. Cryst. Liq. Cryst. 203, 77 (1991); I. Jánossy, L. Csillag, A. D. Lloyd, Phys. Rev. A 44, 8410 (1991).
[CrossRef] [PubMed]

1990 (1)

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Abbate, G.

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

Hagan, D. J.

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Jánossy, I.

I. Jánossy, Phys. Rev. E 49, 2957 (1994).
[CrossRef]

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

I. Jánossy, T. Kósa, Opt. Lett. 17, 1183 (1992).
[CrossRef] [PubMed]

I. Jánossy, A. D. Lloyd, Mol. Cryst. Liq. Cryst. 203, 77 (1991); I. Jánossy, L. Csillag, A. D. Lloyd, Phys. Rev. A 44, 8410 (1991).
[CrossRef] [PubMed]

Khoo, I. C.

I. C. Khoo, H. Li, Y. Liang, IEEE J. Quantum Electron. 29, 1444 (1993); H. Li, Y. Liang, I. C. Khoo, Mol. Cryst. Liq. Cryst. 251, 85 (1994).
[CrossRef]

Kitaeva, V. F

A. S. Zolotko, V. F Kitaeva, D. B. Terskov, Sov. Phys. JETP 106, 1722 (1994).

Kósa, T.

Li, H.

I. C. Khoo, H. Li, Y. Liang, IEEE J. Quantum Electron. 29, 1444 (1993); H. Li, Y. Liang, I. C. Khoo, Mol. Cryst. Liq. Cryst. 251, 85 (1994).
[CrossRef]

Liang, Y.

I. C. Khoo, H. Li, Y. Liang, IEEE J. Quantum Electron. 29, 1444 (1993); H. Li, Y. Liang, I. C. Khoo, Mol. Cryst. Liq. Cryst. 251, 85 (1994).
[CrossRef]

Lloyd, A. D.

I. Jánossy, A. D. Lloyd, Mol. Cryst. Liq. Cryst. 203, 77 (1991); I. Jánossy, L. Csillag, A. D. Lloyd, Phys. Rev. A 44, 8410 (1991).
[CrossRef] [PubMed]

Maddalena, P.

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

Paparo, D.

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

Said, A. A.

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Santamato, E.

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

Sheik-Bahae, M.

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Terskov, D. B.

A. S. Zolotko, V. F Kitaeva, D. B. Terskov, Sov. Phys. JETP 106, 1722 (1994).

Van Stryland, E. W.

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Wei, T. H.

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Zolotko, A. S.

A. S. Zolotko, V. F Kitaeva, D. B. Terskov, Sov. Phys. JETP 106, 1722 (1994).

IEEE J. Quantum Electron. (2)

I. C. Khoo, H. Li, Y. Liang, IEEE J. Quantum Electron. 29, 1444 (1993); H. Li, Y. Liang, I. C. Khoo, Mol. Cryst. Liq. Cryst. 251, 85 (1994).
[CrossRef]

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, E. W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).
[CrossRef]

Mol. Cryst. Liq. Cryst. (2)

D. Paparo, P. Maddalena, G. Abbate, E. Santamato, I. Jánossy, Mol. Cryst. Liq. Cryst. 251, 93 (1994).
[CrossRef]

I. Jánossy, A. D. Lloyd, Mol. Cryst. Liq. Cryst. 203, 77 (1991); I. Jánossy, L. Csillag, A. D. Lloyd, Phys. Rev. A 44, 8410 (1991).
[CrossRef] [PubMed]

Opt. Lett. (1)

Phys. Rev. E (1)

I. Jánossy, Phys. Rev. E 49, 2957 (1994).
[CrossRef]

Sov. Phys. JETP (1)

A. S. Zolotko, V. F Kitaeva, D. B. Terskov, Sov. Phys. JETP 106, 1722 (1994).

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Figures (4)

Fig. 1
Fig. 1

Absorption coefficients of the guest–host systems; 0.5% R4 in two different hosts. The absorption coefficients were calculated from the transmission spectra of 25-μm-thick planar samples taken with ordinary and extraordinary polarizations.

Fig. 2
Fig. 2

Examples of Z-scan curves. Upper curves, pure E63; lower curves, 0.5% R4 in E63. The y axes show the difference between the detected signals without and with applied optical field, normalized to the average signal and the input power. (The solid curves are only a guide to the eye.)

Fig. 3
Fig. 3

Amplification factor as a function of the photon energy and wavelength. (The solid curves are only a guide to the eye.)

Fig. 4
Fig. 4

Schematic energy-level system of the dye molecules.

Equations (3)

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η = Δ v dye / P dye av Δ v host / P host - 1.
P dye av = P dye 1 - exp ( - α d ) α d ,
E S 1 * - E S 0 * = h ν .

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