Shi Lei, Shi Jianru, McManamon Paul F, Bos Philip J
Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
Appl Opt. 2010 Jan 20;49(3):409-21. doi: 10.1364/AO.49.000409.
We have investigated the causes of low efficiency for optical beam steering devices based on liquid crystal decentered microlens arrays (DLAs). We show that the efficiency is effected by the relative phase of light exiting the individual lenses, the imperfect focusing of small lenses due to diffraction, the aberrations related to off-axis light going through a lens, and the diffraction spreading of light beams going through the DLA structure. A high steering efficiency of over 94.4% is demonstrated by modeling the transmitted light through the DLA with scalar diffraction theory. We also propose modified phase profiles for the lenses that are a function of angle that substantially improve the performance of these types of device over the unmodified profiles.
我们研究了基于液晶偏心微透镜阵列（DLA）的光束转向装置效率低下的原因。我们发现，效率受到离开各个透镜的光的相对相位、由于衍射导致的小透镜聚焦不完善、与离轴光穿过透镜相关的像差以及穿过DLA结构的光束的衍射扩展的影响。通过用标量衍射理论对透过DLA的透射光进行建模，证明了超过94.4%的高转向效率。我们还提出了作为角度函数的透镜修正相位分布，与未修正的分布相比，这能显著提高这类装置的性能。
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