Figure 4.
(a) Spatial distribution of relative irradiance (intensity) of excitation light in skin model. The color bar indicates the relative intensity from 1 to 10−11. The green line at the origin indicates the green color of the light source. The light source is a uniform-intensity circle with diameter of 100 μm. The thickness values for upper dermis, dermis, and deep dermis were 270 μm, 1500 μm, and 230 μm, respectively (see Fig. 1). (b) Simulation output for relative power of excitation light versus depth. Error bars (three runs @ 10,000 rays) were too small to be observed on a plot. (c) Radius of excitation areas with different fraction of total excitation power versus depth. The light source considered in these cases was a circle with diameter of 100 μm. (Color online only.)