Godfrey Alan T K, Kallepalli Deepak L N, Rashid Sabaa, Ratté Jesse, Zhang Chunmei, Corkum P B
Opt Express. 2022 Oct 24;30(22):39922-39931. doi: 10.1364/OE.470141.
Blister formation occurs when a laser pulse interacts with the underside of a polymer film on a glass substrate and is fundamental in Laser-Induced Forward Transfer (LIFT). We present a novel method of controlling blister formation using a thin metal film situated between two thin polymer films. This enables a wide range of laser pulse energies by limiting the laser penetration in the film, which allows us to exploit nonlinear interactions without transmitting high intensities that may destroy a transfer material. We study blisters using a helium ion microscope, which images their interiors, and find that laser energy deposition is primarily in the metal layer and the top polymer layer remains intact. Blister expansion is driven by laser-induced spallation of the gold film. Our work shows that this technique could be a viable platform for contaminant-free LIFT using nonlinear absorption beyond the diffraction limit.
当激光脉冲与玻璃基板上聚合物薄膜的底面相互作用时，会形成气泡，这是激光诱导正向转移（LIFT）的基本现象。我们提出了一种使用位于两个聚合物薄膜之间的薄金属膜来控制气泡形成的新方法。通过限制激光在薄膜中的穿透深度，这使得能够使用宽范围的激光脉冲能量，从而使我们能够利用非线性相互作用，而无需传输可能破坏转移材料的高强度激光。我们使用氦离子显微镜研究气泡，该显微镜能够对气泡内部进行成像，并发现激光能量主要沉积在金属层中，而顶部聚合物层保持完整。气泡的膨胀是由激光诱导的金膜剥落驱动的。我们的工作表明，该技术可能是一个可行的平台，用于利用超越衍射极限的非线性吸收实现无污染物的LIFT。
