Figure 4.

Scanning electron microscope images of three different samples. (a) Structure with a lattice parameter of 3 μm due to the proton beam line spacing was set to 3 μm. (b) Same structure with a lattice parameter of 2 μm. (c) The photonic slab presents a period of 1.5 μm.

Recio-Sánchez et al. Nanoscale Research Letters 2012 7:449   doi:10.1186/1556-276X-7-449
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