title: Influence of pretilt angle on disclination lines of liquid crystal lens.
abstract: This article investigates the effect of pretilt angle on disclination lines of liquid crystal (LC) lenses. When the pretilt angle of LCs is higher than 7°, the disclination lines are reduced and are moved to the boundary of the LC lens. The disclination lines at the boundary do not influence the focused beam profile of the LC lens. As the pretilt angle of LCs further increases, the disclination lines at the boundary become almost invisible. However, the interference rings become asymmetrical. The response time of an LC lens with a pretilt angle higher than 7° is ∼60% of the conventionally homogeneous LC lens. This value is a result of the decrease in the rotation angle of the LCs and the reduced disclination lines.
authors: Graduate Institute of Photonics, National Changhua University of Education, Changhua 500, Taiwan.
authors: Chia-Hao
authors: CH
authors: Kuo
authors: Wei-Che
authors: WC
authors: Chien
authors: Chia-Ting
authors: CT
authors: Hsieh
authors: Chi-Yen
authors: CY
authors: Huang
authors: Jyun-Jie
authors: JJ
authors: Jiang
authors: Yan-Cheng
authors: YC
authors: Li
authors: Ming-Fei
authors: MF
authors: Chen
authors: Yi-Ping
authors: YP
authors: Hsieh
authors: Hui-Lung
authors: HL
authors: Kuo
authors: Chi-Huang
authors: CH
authors: Lin