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Electrically switchable liquid crystal Fresnel lens using UV-modified alignment film
Shie-Chang Jeng1, Shug-June Hwang, Jing-Shyang Horng
1Institute of Imaging and Biomedical Photonics, National Chiao Tung University, Tainan 711, Taiwan.
Optics Express
|December 18, 2010
Summary
Researchers developed a simple method for switchable liquid crystal (LC) Fresnel lenses using UV light to modify alignment layers. This technique achieves high diffraction efficiency (~31.4%) at low driving voltages for advanced optical applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Liquid Crystal Displays
Background:
- Liquid crystal (LC) lenses offer tunable optical properties.
- Achieving high diffraction efficiency and low driving voltage in LC lenses remains a challenge.
- Photo-induced surface modification presents a novel approach for fabricating LC devices.
Purpose of the Study:
- To propose a simple and effective method for fabricating switchable liquid crystal Fresnel lenses.
- To achieve high diffraction efficiency and low driving voltage in the fabricated LC Fresnel lenses.
- To explore the potential of photo-induced surface modification for advanced optical device fabrication.
Main Methods:
- Developed a method based on photo-induced surface modification of the vertical alignment layer.
- Utilized UV illumination to alter the pretilt angle of alignment layers.
- Achieved a Fresnel zone-distribution hybrid alignment in a homeotropic LC cell via UV exposure.
Main Results:
- Successfully fabricated a concentric structure of a Fresnel phase LC lens.
- Attained a remarkable diffraction efficiency of approximately 31.4%.
- The achieved diffraction efficiency is comparable to the Fresnel zone plate mask (32%) using a linearly polarized incident beam.
Conclusions:
- The proposed method offers a straightforward way to create switchable LC Fresnel lenses.
- The fabricated lenses exhibit high diffraction efficiency and operate at low driving voltages.
- Photo-induced surface modification is a promising technique for advanced LC optical device development.
