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Digitally reconfigurable complex two-dimensional dual-lattice structure by optical phase engineering

机译：通过光学相位工程进行数字可重构的复杂二维双晶格结构

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摘要

We present a method to combine two periodic lattice wave fields to generate a complex dual-lattice wave field which could be employed for microfabrication of corresponding two-dimensional dual-lattice structures. Since the addition of two periodic lattice wave fields is coherent in nature, the resultant dual-lattice structure is highly dependent on the relative phase difference between constituent wave fields. We show that it is possible to have control over the dual-lattice pattern by precisely controlling this relative phase difference. This control is enabled by making use of digitally addressable phase-only spatial light modulator (SLM). We provide the computational method for calculation of the corresponding phase mask to be displayed on the SLM and also verify the results experimentally by employing a simple 4f Fourier filter-based geometry. The method is completely scalable and reconfigurable in terms of the choice of periodic lattice wave fields and has the potential to form gradient phase masks which could be useful for fabrication of graded-index optical components.
机译：我们提出一种结合两个周期性晶格波场以生成复杂的双晶格波场的方法，该方法可用于相应二维双晶格结构的微细加工。由于两个周期晶格波场的相加本质上是相干的，因此所得的双晶格结构高度依赖于组成波场之间的相对相位差。我们表明，可以通过精确控制此相对相位差来控制双晶格图案。通过使用数字可寻址的仅相位空间光调制器（SLM）启用此控制。我们提供了一种计算方法，用于计算要在SLM上显示的相应相位掩码，并且还通过采用基于4f Fourier滤波器的简单几何图形对实验结果进行了验证。该方法在周期性晶格波场的选择方面是完全可扩展和可重构的，并且具有形成梯度相位掩模的潜力，该梯度相位掩模可用于制造渐变折射率光学部件。

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