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Switchable Fresnel lens using polymer-stabilized liquid crystals

Yun-Hsing Fan, Hongwen Ren, and Shin-Tson Wu

Open Access Open Access

Abstract

A switchable Fresnel zone plate lens is demonstrated using a polymer-stabilized liquid crystal. The fabrication process is relatively simple and the device can be operated below 10 volts with fast response time. Such a device works well for a linearly polarized light.

©2003 Optical Society of America

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Figures (8)
Fig. 1.
Fig. 1. Schematic representation of the photomask patterns and the corresponding LC arrangement of the PSLC Fresnel lens.

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Fig. 2.
Fig. 2. Microscope images of the PSLC cell at (a) V=0, (b) 4 Vrms, (c) 7 Vrms, and (d) 10 Vrms. The LC cell is sandwiched between crossed polarizers.

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Fig. 3.
Fig. 3. The experimental setup for studying the focusing properties of the PSLC Fresnel lens. L1: focal length 50 mm, L2: focal length 250 mm, and P: 30 µm pinhole.

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Fig. 4.
Fig. 4. The observed laser beam images: (a) without LC sample, (b) with sample at V=0, and (c) with LC sample at 8 Vrms. λ=633 nm.

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Fig. 5.
Fig. 5. The observed laser beam images (a) at V=0 and (b) at 8 Vrms. λ=633 nm. The CCD camera was 27 cm away from the sample

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Fig. 6.
Fig. 6. Beam intensity profile measured by the CCD camera at V=8Vrms. The diameter of the Fresnel zone plate is 1 cm and the focal length is 50 cm.

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Fig. 7.
Fig. 7. Beam intensity profiles at (a) V=0, (b) 8 Vrms, and (c) 20 Vrms. The diameter of the Fresnel zone plate is 1 cm and the focal length is 50 cm.

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Fig. 8.
Fig. 8. The voltage-dependent diffraction efficiency of the PSLC Fresnel lens. LC: MLC-6252, cell gap d=5 µm, and monomer concentration 5%.

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