Hemisphere-on-a-post model for a 3 × 3 non-uniform array domain. In (a), (b), and (c), respectively, height, radius, and position are separately randomized. In (d), all three parameters are randomized at the same time. The red regions indicate strong electric field.
Dall'Agnol and den Engelsen Nanoscale Research Letters 2013 8:319 doi:10.1186/1556-276X-8-319