TY - JFULL AU - Wen-Chi Hung and Tung-Kai Liu and Ming-Shan Tsai and Chun-Che Lee and I-Min Jiang PY - 2011/8/ TI - Voltage-Controllable Liquid Crystals Lens T2 - International Journal of Physical and Mathematical Sciences SP - 979 EP - 983 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/7753 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 55, 2011 N2 - This study investigates a voltage-controllable liquid crystals lens with a Fresnel zone electrode. When applying a proper voltage on the liquid crystal cell, a Fresnel-zone-distributed electric field is induced to direct liquid crystals aligned in a concentric structure. Owing to the concentrically aligned liquid crystals, a Fresnel lens is formed. We probe the Fresnel liquid crystal lens using a polarized incident beam with a wavelength of 632.8 nm, finding that the diffraction efficiency depends on the applying voltage. A remarkable diffraction efficiency of ~39.5 % is measured at the voltage of 0.9V. Additionally, a dual focus lens is fabricated by attaching a plane-convex lens to the Fresnel liquid crystals cell. The Fresnel LC lens and the dual focus lens may be applied for DVD/CD pick-up head, confocal microscopy system, or electrically-controlling optical systems. ER -