Gap Nanoantennas toward Molecular Plasmonic Devices

Figure 3

Theoretical and experimental spectra of the electric field intensity and extinction for antennas made of nanorods of different lengths and with 30 nm gap. (a) and (b) Plot the experimental and theoretical spectra (in the quasistatic regime), while (c) and (d) show the theoretical spectra in the retarded regime. All spectra are depicted for both excitation polarization states. Note that the theoretical curves depict the electric field in the gap of the structures, whereas the data represent the response of the total structure. The two insets give the total electric field distribution for the 450 nm long rods at the peaks A (at 580 nm) and B (at 500 nm). The white arrows indicate the considered polarization.