Figure 1: Electron microscopy of laser-irradiated PET substrates. Upper panel: SEM images of resulting structures after excimer laser irradiation of PET substrates. Left: ripples, 6000 pulses of linear polarized KrF laser radiation ( ) at a fluence of 9 mJ cm−2. Right: walls, 30 pulses of ArF laser radiation ( ) at fluences of 30 mJ cm−2. Lower panel: TEM images of HMEC grown on pristine PET (flat, left) or laser irradiated with surface topography (ripples, middle; walls, right); PM and arrow indicate basal plasma membrane; PET and arrow indicate border of PET substrate.