Abstract
In this study, the influence of femtosecond double-pulses in inducing bulge structures on thin gold films were experimentally examined. The experimental results indicate that the morphology of bulge structures evolved alternately with an increase in the time delay between two subpulses under the condition that the total pulse energy remained the same. This phenomenon is different from that observed in previous studies in which femtosecond double-pulses were used for processing metal materials. Through the combination of the two-temperature model and the generalized thermoelastic theory, the stress distribution inside the gold film was calculated under different time delays. Moreover, the aforementioned experimental phenomenon was explained using the superposition principle of the stress waves generated by two subpulses. The infrared reflection spectra of gold bulge arrays processed under different time delays were also investigated. This research presents a strategy for obtaining detailed understanding regarding the physical mechanism of the interaction between femtosecond double-pulses and thin metal films. It also presents a strategy for optimizing the parameters of pulse trains to adjust the stress distribution to achieve the shape evolution of the formed structures.
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