期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 107, 期 1, 页码 151-155出版社
SPRINGER
DOI: 10.1007/s00340-012-4885-0
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资金
- National Science Council of Taiwan [NSC 98-2112-M-009-020-MY2, NSC 98-2221-E-239-003-MY2, NSC 100-2112-M-009-014-MY3]
The surface energy of a conventional homeotropic polyimide (PI) alignment layer was altered via ultraviolet (UV) light irradiation, and the pretilt angle of the PI was changed along with the surface energy. The surface energy can be controlled by either UV exposure time or irradiation intensity. A switchable liquid crystal Fresnel lens (LCFL) was created by the UV-treated alignment layers to form a Fresnel zone-distribution hybrid alignment, vertically aligned and hybrid aligned LC in the odd and even zones, respectively. The LCFL was made polarization-independent by circular buffing, and it had a diffraction efficiency of similar to 22% at a low driving voltage of similar to 1.2 V.
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