Abstract

Photorefractive diffraction gratings were studied in cells of homeotropically aligned pentyl-cyanobiphenyl liquid crystal. These holographic gratings were induced by the simultaneous and nonsimultaneous application of dc and coherent optical electric fields. The observed behavior was consistent with a predominantly surface-mediated photorefractive effect. Beam coupling was observed in all cases and led to a model involving screened and unscreened interfacial trapped charges driving a modulation of the easy axis. Holographic gratings could be switched on and off by the application of a small voltage.

© 2000 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]

1998 (1)

1996 (2)

B. Y. Zhang, R. Burzynski, S. Ghosal, and M. K. Casstevens, Adv. Mater. 8, 111 (1996).
[CrossRef]

I. C. Khoo, IEEE J. Quantum Electron. 32, 525 (1996).
[CrossRef]

1994 (3)

I. C. Khoo and H. Li. Y. Liang, Opt. Lett. 19, 1723 (1994).
[CrossRef] [PubMed]

E. V. Rudenko and A. V. Sukhov, JETP Lett. 59, 142 (1994).

E. V. Rudenko and A. V. Sukhov, JETP 78, 875 (1994).

Burzynski, R.

B. Y. Zhang, R. Burzynski, S. Ghosal, and M. K. Casstevens, Adv. Mater. 8, 111 (1996).
[CrossRef]

Casstevens, M. K.

B. Y. Zhang, R. Burzynski, S. Ghosal, and M. K. Casstevens, Adv. Mater. 8, 111 (1996).
[CrossRef]

Ghosal, S.

B. Y. Zhang, R. Burzynski, S. Ghosal, and M. K. Casstevens, Adv. Mater. 8, 111 (1996).
[CrossRef]

Khoo, I. C.

Liang, H. Li. Y.

Rudenko, E. V.

E. V. Rudenko and A. V. Sukhov, JETP Lett. 59, 142 (1994).

E. V. Rudenko and A. V. Sukhov, JETP 78, 875 (1994).

Saleh, B. E. A.

B. E. A. Saleh and M. C. Teich, Fundamental of Photonics (Wiley, New York, 1991).
[CrossRef]

Sukhov, A. V.

E. V. Rudenko and A. V. Sukhov, JETP 78, 875 (1994).

E. V. Rudenko and A. V. Sukhov, JETP Lett. 59, 142 (1994).

Tabiryan, N.

Teich, M. C.

B. E. A. Saleh and M. C. Teich, Fundamental of Photonics (Wiley, New York, 1991).
[CrossRef]

Umeton, C.

Zhang, B. Y.

B. Y. Zhang, R. Burzynski, S. Ghosal, and M. K. Casstevens, Adv. Mater. 8, 111 (1996).
[CrossRef]

Adv. Mater. (1)

B. Y. Zhang, R. Burzynski, S. Ghosal, and M. K. Casstevens, Adv. Mater. 8, 111 (1996).
[CrossRef]

IEEE J. Quantum Electron. (1)

I. C. Khoo, IEEE J. Quantum Electron. 32, 525 (1996).
[CrossRef]

J. Opt. Soc. Am. B (1)

JETP (1)

E. V. Rudenko and A. V. Sukhov, JETP 78, 875 (1994).

JETP Lett. (1)

E. V. Rudenko and A. V. Sukhov, JETP Lett. 59, 142 (1994).

Opt. Lett. (1)

Other (2)

B. E. A. Saleh and M. C. Teich, Fundamental of Photonics (Wiley, New York, 1991).
[CrossRef]

P. Guenter and J.-P. Huignard, eds., Photorefractive Materials and Their Applications (Springer-Verlag, New York, 1988, 1989), Vols. 1 and 2.
[CrossRef]

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Figures (2)

Fig. 1
Fig. 1

Diffracted intensity (in arbitrary units) of a continuously incident He–Ne probe beam during a program of applying an electric field Edc and a pair of Ar-laser writing beams I0 in the order indicated.

Fig. 2
Fig. 2

Asymmetric two-beam coupling of the lowest diffraction order of Ar-laser writing beams in a homeotropically aligned LC cell. The experimental geometry is indicated in the inset.

Equations (2)

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ρ±x,z=01+β cos qx,
Exx,z=0=Eρ sin qx,Ezx,z=0=Eρz+Eρ cos qx.

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