Numerical analysis and design of patterned electrode liquid crystal microlens array with dielectric slab

• Published in: Optics and laser technology Vol. 44; no. 6; pp. 1834 - 1839
• Main Authors: Xiangjie, Zhao, Dayong, Zhang, Yongquan, Luo, Cangli, Liu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2012
• Subjects: Director distribution; Liquid crystal microlens array; Phase profile; Liquid crystal microlens array; Director distribution; Phase profile
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2012.01.014

The phase profile of hole patterned electrode liquid crystal (LC) microlens array (MLA) was studied by a numerical method. It indicated that the formation of inverse domain and tilt wall in the liquid crystal cell limits the optical performance of the microlens array. The physical mechanism that determines the formation of inverse domain and tilt wall was elucidated by analyzing the phase profile and the liquid crystal director distribution. According to our numerical results, a new configuration for hole patterned electrode liquid crystal microlens array was proposed by introducing a dielectric slab between the patterned electrode and the liquid crystal. The physical parameters that influence the optical performance of this new configuration LC MLA were studied, which provide fundamental information for the design. The results indicate that the phase profile and focusing power of the new configuration is greatly improved. ► The phase profile of a patterned electrode liquid crystal microlens array was numerically studied. ► The physical mechanism that deteriorates the focusing properties of the microlens was elucidated. ► A new configuration of microlens array was proposed and the phase profile was greatly improved.