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. 2021 Apr 27;11(5):1123. doi: 10.3390/nano11051123

Figure 1.

Figure 1

AFM images of combined LIPSS structures formed by sequential irradiation in P3HT. Each AFM image is complemented with its corresponding Fast Fourier Transform (FFT) pattern. (a) Sequential irradiation process at λ= 532 nm, 3500 pulses and λ = 532 nm, 100 pulses with the polarization rotated 90°, (b) λ = 266 nm, 3300 pulses and λ = 266 nm 300 pulses with the polarization rotated 90° and (c) 532 nm, 3600 pulses and λ = 266 nm 300 pulses with the polarization rotated 90°. Arrows indicate the direction of the laser polarization during each irradiation step.