Figure 4
From: On the Large Near-Field Enhancement on Nanocolumnar Gold Substrates
Theoretical results of the electromagnetic field-enhancement for Ex polarisation. Panels (a,b) show the maximum field-enhancement as a function of the wavelength and vertical position of the Au10 and Au20 samples respectively. Panels (c,d) show, respectively, the maximum field-enhancement for the Au10 and Au20 samples, as a function of the sample vertical position at 532, 633, and 785 nm, i.e., at the dashed white lines in (a,b) respectively. The origin in the vertical position scale (0 nm) denotes the interface between the nanostructured film and the substrate. The thin film is represented by the yellow vertical lines in (a,b) and by the pale yellow area in (c,d).
