One-click electromagnetism at the nanoscale
Two plasmon peaks: a weak transverse one near 520 nm and a strong longitudinal one that moves to longer wavelengths as the rod gets longer. An 80 × 20 nm gold spheroid (aspect ratio 4) in water resonates near 800 nm.
With an exact T-matrix for spheroids, for any aspect ratio, orientation and polarization.
A spheroid has rounded ends; real rods have flatter caps, which shift the longitudinal peak somewhat. The trends with aspect ratio, medium and size are the same.
Spectra of nanorods and spheroids of any aspect ratio and orientation, from an exact T-matrix, in one click.