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. 2012 Aug 7;3:989. doi: 10.1038/ncomms1996

Figure 5. Spiral relief patterns obtained for different illumination doses.

Figure 5

AFM images of the topographical structures obtained for varying illumination intensity and fixed time of exposure (and polarization direction), for topological charge q=10. The white arrow indicates the polarization direction. Different panels correspond to different values of the laser power injected in the microscope: (a) 15 μW; (b) 18 μW; (c) 21 μW; (d) 29 μW; (e) 41 μW; (f) 54 μW. Similar results are obtained for varying time of exposure at fixed intensity.