1 厦门大学 电子工程系 微纳光电子研究室, 福建 厦门 361005
2 洛阳光电技术研究中心, 河南 洛阳 471009
采用严格数值算法对中红外硅微透镜阵列进行了模拟, 该微透镜阵列特征尺寸小于波长工作波长.研究发现该微透镜阵列存在一个显著的离焦效应, 其离焦量达到0.4左右, 超出了现有的传统理论模型预测范围.对微透镜阵列进行了制作和焦距测试, 发现测试结果跟数值模拟基本吻合.微纳衍射光学集成系统中透镜离焦量是系统集成非常重要的一个参数, 该研究结果为硅微透镜阵列和中红外探测器光学集成提供有效参考.
亚波长结构 红外探测器 离焦 微透镜阵列 sub-wavelength structure FDTD FDTD infrared detector focal shift microlens array
Author Affiliations
Abstract
Department of Electronic Engineering, School of Information Science and Engineering, Xiamen University, Xiamen 361005, China
We demonstrate a soft lithography approach for fabrication of a topographically patterned polyvinyl alcohol (PVA) liquid-crystal (LC) alignment layer. This specific approach employs modified micromolding in capillaries for negative replication of the PVA microstructures on indium tin oxide (ITO) substrates from patterned poly(dimethylsiloxane) molds in a single step, leading to planar alignment on the desired regions. By doping with polyhedral oligomeric silsesquioxane nanoparticles, which can induce vertical alignment on bare ITO surfaces, periodic LC phase gratings based on an alternating vertical-aligned/hybrid-aligned nematic geometry are presented as an application, and a theoretical model was used to simulate and examine the experimental results.
160.3710 Liquid crystals 160.4670 Optical materials 160.5470 Polymers 050.1950 Diffraction gratings Chinese Optics Letters
2015, 13(8): 081603
