Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration. Here we demonstrate an approach that enables us to control the morphology of amorphous solid water (ASW) microstructured targets, by deposition of water vapor on a charged substrate, cooled down to 100 K. The morphology of the deposited ASW structures is controlled by varying the surface charge on the substrate and the pressure of water vapor. The obtained target is structured as multiple, dense spikes, confined by the charged area on the substrate, with increased aspect ratio of up to 5:1 and having a diameter comparable with the typical spot size of the laser focused onto the target.

中文翻译：

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由沉积在带电表面上引起的无定形固体水靶形态的控制

微结构靶材展示了高强度激光脉冲与靶材的增强耦合，并在激光诱导的离子加速中发挥重要作用。在这里，我们展示了一种方法，该方法使我们能够控制无定形固体水 (ASW) 微结构化目标的形态，方法是在带电基板上沉积水蒸气，冷却至 100 K。沉积的 ASW 结构的形态是通过改变基板上的表面电荷和水蒸气的压力。所获得的目标被构造为多个密集的尖峰，由基板上的带电区域限制，具有高达 5:1 的增加的纵横比，并且具有与聚焦到目标上的激光的典型光斑尺寸相当的直径。