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首页> 外文期刊>Optics Letters >Single-step optical realization of bio-inspired dual-periodic motheye and gradient-index-array photonic structures
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Single-step optical realization of bio-inspired dual-periodic motheye and gradient-index-array photonic structures

机译：生物启发的双周期Motheye和梯度折射率阵列光子结构的单步光学实现

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摘要

This Letter demonstrates a single-step optical realization method for hexagonal and square lattice-based dual periodic motheye and gradient-index-array photonic structures over large areas. Computed phase mask of gradient interference patterns are used as inputs to a phase-only spatial light modulator (SLM), and the first-order diffracting beams are coherently superposed with the help of a 2f-2f Fourier filtering setup to avoid complex optical geometry for generation and control of individual beams. The simulated interference patterns are verified experimentally through a CMOS camera. The fabricated micro-structures on a positive photoresist are shown to have a major periodicity of 638 mu m and minor periodicity of 25.2 mu m, with the air hole diameter varying from 22.7 to 6.9 mu m along the X and Y axes. The depth of the fabricated structure gradually varies from 4.203 mu m at the center to 1.818 mu m at the corner. These structures may be scaled down to submicron features that can show improved anti-reflection properties for solar energy harvesting and GRIN lens for optical wavelength region. (C) 2016 Optical Society of America
机译：这封信演示了一种用于大面积基于六边形和正方形晶格的双周期分子式和梯度折射率阵列光子结构的单步光学实现方法。梯度干涉图样的计算相位掩模用作纯相位空间光调制器（SLM）的输入，并且借助2f-2f傅里叶滤波设置将一阶衍射光束相干叠加，从而避免了复杂的光学几何结构。单个光束的生成和控制。模拟的干涉图样通过CMOS相机进行了实验验证。在正性光致抗蚀剂上制造的微结构显示具有638μm的主要周期性和25.2μm的次要周期性，沿X和Y轴的气孔直径在22.7至6.9μm之间变化。制成的结构的深度从中心的4.203微米到角落的1.818微米逐渐变化。这些结构可以按比例缩小至亚微米级特征，这些特征可以显示出用于太阳能收集的改进的抗反射特性以及用于光波长区域的GRIN透镜。 （C）2016美国眼镜学会

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