Figure 4
From: Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films
(a–d) Normalized field enhancement plots of the electric field component parallel to the column axis, \({{\bf{E}}}_{{{\bf{N}}}_{{\rm{c}}}}\), within the slanting plane of a Si-Au SCHTF calculated using finite element modeling. Parameters are given in Table 1, and here LAu = 4 nm. The incident electric field is parallel to Nc, for photon energy (a) 1.45 eV (quadrupole-like mode), (b) 2.56 eV (coupled-plasmon-like mode), and (c) 3.6 eV (Si inter-band transition-like mode). (d) Enlarged region near a Si-Au-Si subcolumn sequence for the quadrupole-like mode, where resemblance with a quadrupole field distribution can be seen. (e) Electric field ratio between incident field amplitude and field amplitude within the columnar structure along the solid green line in (d).
