Uniform, high-spatial-frequency ripples generated on ferric ion-doped poly(N-vinylpyrrolidone) film using a femtosecond laser at high repetition rate

Uniform HSFLs with periods of 40-nm to 100-nm have been generated on ferric iondoped poly(N-vinylpyrrolidone) films at high repetition rate femtosecond laser pulses (80 MHz, 800 nm, 130 fs). Our results show that SPPs excited in thin polymer films illustrates well the formation of nanostructures and its dynamic properties observed.