Figure 2
From: Metamaterial study of quasi-three-dimensional bowtie nanoantennas at visible wavelengths
Experimental top-view OM images of microholes etched approximately (a) 0 min, (b) 5 min, and (c) 13 min on the glass substrate. Experimental top-view OM images of microholes etched approximately (d) 0 min, (e) 3 min, and (f) 18 min on the Si substrate.
