Figure 5: Time evolution of the photo-induced NV− pattern.
From: Optical patterning of trapped charge in nitrogen-doped diamond
Following a green scan (reset), we use a weak red beam to image the pattern resulting from green, fixed-point illumination of variable duration tG. Unlike the protocol in Fig. 3, no prior bleaching is carried out. The green, fixed-point illumination times are (a) 1 s, (b) 2 s, (c) 5 s, (d) 7 s, (e) 10 s, (f) 15 s, (g) 30 s and (h) 60 s. The green and red laser powers are 1.8 mW and 100 μW, respectively. All images are recorded by scanning the red laser beam one time. All other conditions as in Fig. 4. (h) Observed (upper graph) and calculated (lower graph) dependence of the inner and outer diameters of the NV− pattern as a function of tG. Filled (empty) squares are experimental (calculated) data points; solid and dashed lines serve as a guide to the eye. The scale bar in a and axes labels in e apply to all scanned images. All parameters as listed in Supplementary Table 1.
