Colloidal transformation based on simple physicochemical processes has produced a wide variety of functional structures for different applications. But the lack of local selectivity of conventional transformation methods makes the fabrication of nanodevices with desired optical properties challenging. Here, we use a laser beam to transform spherical polystyrene (PS) beads into bull's eye-shaped nanopatterns or concentric nanorings, depending on the time of irradiation. The final morphologies are dependent on the size of the PS beads and the dielectric nature of the substrates. The simulated near field features show that it is the selective hollowing of PS beads that results in collapsing and buckling of the shells. This understanding provides a new route towards unconventional colloidal nanostructures and defect engineering in 2D photonic crystals that can be locally and selectively controlled by light.

中文翻译：

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带灯的聚苯乙烯珠屈曲†

基于简单的物理化学过程的胶体转化产生了多种功能结构，可用于不同的应用。但是传统转换方法缺乏局部选择性使得具有所需光学性质的纳米器件的制造具有挑战性。在这里，根据照射时间，我们使用激光束将球形聚苯乙烯（PS）珠转化为牛眼形纳米图案或同心纳米环。最终的形态取决于PS珠的尺寸和基材的介电性质。模拟的近场特征表明，正是PS珠的选择性空心化导致了壳的塌陷和屈曲。