Pishnyak Oleg, Sato Susumu, Lavrentovich Oleg D
Chemical Physics Interdisciplinary Program, Kent State University, Ohio 44242-0001, USA.
Appl Opt. 2006 Jul 1;45(19):4576-82. doi: 10.1364/ao.45.004576.
We report on an electrically controlled liquid-crystal-based variable optical lens filled with a dual-frequency nematic material. The lens design employs a hole-patterned electrode structure in a flat nematic cell. In order to decrease the lens switching time we maximize the dielectric torque by using a dual-frequency nematic material that is aligned at an angle approximately 45 degrees with respect to the bounding plates by obliquely deposited SiO(x), and by using an overdrive scheme of electrical switching. Depending on the frequency of the applied field, the director realigns either toward the homeotropic state (perpendicular to the substrates) or toward the planar state (parallel to the substrates), which allows one to control not only the absolute value of the focal length but also its sign. Optical performance of the liquid-crystal lens is close to that of an ideal thin lens.
我们报道了一种基于电控液晶的可变光学透镜，其填充有双频向列型材料。该透镜设计采用了平面向列型液晶盒中的孔图案电极结构。为了缩短透镜的切换时间，我们通过使用双频向列型材料来最大化介电扭矩，该材料通过倾斜沉积SiO(x)相对于边界板以大约45度的角度排列，并采用电切换的过驱动方案。根据所施加电场的频率，指向矢要么重新排列到垂直取向状态（垂直于基板），要么重新排列到平面取向状态（平行于基板），这使得不仅可以控制焦距的绝对值，还可以控制其符号。液晶透镜的光学性能接近理想薄透镜的光学性能。
