Abstract

A 1 mm × 1 mm nematic liquid-crystal three-terminal device for optical beam forming (focusing/spoiling) is fabricated. A thin-film-resistor network on the device substrate layer is used to control the voltages on the 98 internal lens electrodes by use of only one variable external driver. By using a high-resistance thin-film layer of amorphous silicon under the 98-element parallel electrode structure layer, we generate a near-continuous index perturbation to form a cylindrical lens. The focal length of this lens is continuously variable from inifinity to 12 cm by use of a variable 1–4-V-peak 1-kHz square-wave external terminal control signal.

© 1994 Optical Society of America

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References

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    [CrossRef]
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1989 (1)

M. C. DeJule, GE NoteBook 226, 28 (1989).

1988 (1)

1984 (2)

1979 (1)

S. Sato, Jpn. Appl. Phys. 18, 1679 (1979).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Top view of the novel thin-film-resistor network biased NLC lens design.

Fig. 2
Fig. 2

NLC device built at the General Electric Corporate Research and Development Center that demonstrates the novel thin-film-resistor network biased NLC lens. The two 1 mm × 1 mm areas on the left-hand side of the device are the two three-terminal lenses. The other three square areas, on the right-hand side, are multielectrode multidriver lenses with varying electrode pitches designed for optical beam deflection.

Fig. 3
Fig. 3

Side view of the device, showing various positions of the NLC molecules that are electrically controlled and used for generating the quadratic optical phase shifts required to form a variable-focal-length cylindrical lens.

Fig. 4
Fig. 4

Demonstration of the 1 mm × 1 mm NLC device. The photographs on the left-hand side show the cylindrical-lens focusing effect when color (or gray-scale) coding of the near-quadratic refractive-index perturbation was used for two different focal lengths or device drive voltages. The top photograph on the right-hand side shows the light distribution with the NLC lens turned off. The middle and bottom photographs show the lens focusing effect (focal length, 12 cm) observed spatially (by means of the CCD) and through an oscilloscope trace, respectively. All photographs were taken at a distance of 12 cm from the NLC device.

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