Novel self-organization mechanism in ultrathin liquid films: Theory and experiment

When an ultrathin metal film of thickness h (< 20 nm) is melted by a nanosecond pulsed laser, the film temperature is a nonmonotonic function of h and achieves its maximum at a certain thickness h(*). This is a consequence of the h and time dependence of energy absorption and heat flow. Linear stability analysis and nonlinear dynamical simulations that incorporate such intrinsic interfacial thermal gradients predict a characteristic pattern length scale Lambda that decreases for h > h*, in contrast to the classical spinodal dewetting behavior where Lambda increases monotonically as h(2). These predictions agree well with experimental observations for Co and Fe films on SiO2.