Fig. 1

Geometries of nanoantenna and example molecule. The nanoantenna is made of two cuboid silver patches of size \(L\times L\times 50\) nm, separated with a 30-nm thick dielectric spacer with a side length \(L+20\) nm. Please note the upper cuboidal patch is identical to the lower one, while the cut in the figure serves only visualization purposes, so that the location of the molecule can be seen. Geometry of the OsO\({}_{3}\) molecule is sketched in the corner. The molecule is positioned in the center of the nanoantenna indicated by the red dot, with all atoms in the xy plane.