Polarization independent liquid crystal gratings based on orthogonal photoalignments
Polarization independent liquid crystal gratings based on orthogonal photoalignments
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DOI：
10.1063/1.3694921
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发表时间：
2012-03-12
影响因子：
4
通讯作者：
Lu, Yan-Qing
中科院分区：
文献类型：
--
作者：
Hu, Wei;Srivastava, Abhishek Kumar;Lu, Yan-Qing
本文从理论上研究了具有交替正交排列区域的液晶光栅的偏振无关性，并利用光对准技术进行了论证。通过两步曝光来引导磺酸偶氮染料层的取向并进一步排列液晶分子，从而实现相邻区域的不同排列。一维和二维可切换相位光栅已经被证明。这种无偏振器光栅显示出非常高的透射率（类似于92%）、衍射效率（超过31%）和光学对比度（超过150），包括低功耗。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.3694921]
The polarization independence of liquid crystal gratings with alternate orthogonal aligned regions is theoritically studied and demonstrated by means of photoalignment technique. The different alignments in adjecent regions are achieved by two-step photo exposure to guide orientations of sulfonic azo dye layers and further align the liquid crystal molecules. Both one-dimensional and two-dimensional switchable phase gratings have been demonstrated. Such polarizer-free gratings show very high transmittance (similar to 92%), diffraction efficiency (over 31%), and optical contrast (over 150) including low power consumption. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3694921]