Enhanced transmission of the femtosecond laser pulse through metallic nanofilm

We investigate the optical properties of metallic nanofilm heated by the femtosecond laser pulse. Equations for fields and temperatures were solved to calculate the transmission coefficient. It is found that fast electron heating upon absorption of the pulse leads to an increase in the intensity of radiation passing through the metallic nanofilm. •Heating of the film substantially increases effective electron collision frequency.•Thermal variations in the skin layer depth are studied.•Fast electron heating enhances the intensity of transmitted radiation.