Switchable Fresnel lens based on micropatterned alignment.
Switchable Fresnel lens based on micropatterned alignment.
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DOI：
10.1364/ol.38.001775
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发表时间：
2013-06
期刊：
影响因子：
3.6
通讯作者：
Xiao‐Qian Wang;A. Srivastava;V. Chigrinov;H. Kwok
中科院分区：
文献类型：
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作者：
Xiao‐Qian Wang;A. Srivastava;V. Chigrinov;H. Kwok
在这封信中，我们公开了一种制造具有更高效率的液晶（LC）菲涅耳带透镜（FZL）的方法。LCFZL，交替扭曲的双折射（TN）和平面对准（PA）区域的基础上，已制备通过两步光对准过程。两种光学机制的FZL分布，即，在TN和PA对准域中，产生相同的焦距（f）。因此，所提出的LCFZL在焦点处表现出两倍的光强度，因此提供了现有FZL的两倍的效率。此外，由于较低的驱动电压和快速的响应，这些元件可以在许多现代设备中找到应用。
In this Letter we disclose a method to fabricate a liquid crystal (LC) Fresnel zone lens (FZL) with higher efficiency. The LCFZL, based on alternate twisted nematic (TN) and planar aligned (PA) regions, has been prepared by means of a two-step photo-alignment process. The FZL profile for both optical regimes, i.e., in TN and PA alignment domains, generates the same focal length (f). Thus, the proposed LCFZL manifests double light intensity at the focal point and therefore offers double the efficiency of existing FZLs. Moreover, because of lower driving voltage and fast response, these elements could find application in many modern devices.