Figure 7.

Numerical simulation of astigmatism influence on the donut-shaped focal spot. Simulated light intensity distribution vs astigmatism coefficient. (a) Aa = 0.05, (b) Aa = 0.1, (c) Aa = 0.2, and (d) Aa = 0.3. Intensity along x = y and x = −y (e) Aa = 0.05, (f) Aa = 0.1, (g) Aa = 0.2, and (h) Aa = 0.3.

Zhang et al. Nanoscale Research Letters 2013 8:280   doi:10.1186/1556-276X-8-280
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