Figure 7From: Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric ringsSEM images and Raman shift spectrum for the structures with and without the concentric rings. SEM images of (a) the DERS structure and (b) the structure with concentric rings. (c) The Raman shift spectrum of the thiophenol molecule with three different structures, multi-layer film without pattern, structure without concentric rings, and structure with concentric rings.Back to article page