复式二维微结构的计算机模拟

Research on computer simulations of two-dimensional complex microstructures

如何制作由2套或以上简单晶格微结构嵌套而成的复式微结构是近年研究热点之一。利用计算机编程模拟单步全息干涉法产生复式二维微结构,并研究了复式微结构元胞形状的演变规律。研究表明,该新型干涉法仅需最低限度的4束相干光,从而可避免引入更多干涉光束导致的多余倒空间基矢的干扰。4束光的波矢差可产生4套简单晶格,它们彼此嵌套形成复式三角晶格微结构;利用计算机模拟研究了起关键作用的第四束光的偏振和初始相位的影响,实现了空心椭圆、双长条状、双水滴状等丰富、独特形状的元胞图案。将计算机模拟与单步全息干涉法结合起来研究各种复式微结构的产生和演变规律,具有快速、高效、灵活等优点,对指导复式微结构的理论和实验研究具有重要意义。

Realization of complex optical microstructures consisting of two or more sets of simple microstructures has been a hot topic recently. In this paper, the realization mechanism and the evolution law of the unicell of complex microstructures generated by single-step holographic interferometry are studied by computer simulations. Study restults show that the proposed single-step interferometry requires only a minimum of four coherent beams, which avoids the interference from extra basic vectors in k-space. The wave-vector differences among the four beams produce four sets of simple lattices, which are nested with each other to form a complex triangular microstructure. What is more, the fourth beam is found to play a key role in the fabrication of complex optical microstructures, and the influences of its polarization and initial phase are studied by computer simulations. As a result, rich and unique shaped patterns of unitcells, such as a hollow ellipse, a double strip, and a double drop, are achieved. It is fast, efficient, and flexible to study the generation and evolution mechanism of various complex microstructures by combining computer simulation with single-step holographic interferometry, holding great promise in theoretical and experimental researches of complex microstructures.