Figure 2 .

Titled scanning electron microscope images of silicon pillars in square lattice. (a) Period of 2 μm with a large r/a ratio, where r is the radius of the pillars and a is the lattice period. (b) Period of 4 μm with a small r/a ratio.

Dang et al. Nanoscale Research Letters 2012 7:416   doi:10.1186/1556-276X-7-416
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