One-click electromagnetism at the nanoscale
Tightly focused beams, as in optical tweezers or confocal microscopes, have strong field components along the axis; a nanorod responds very differently to them than to a plane wave, depending on its orientation in the focus.
A focused laser of any numerical aperture with linear, circular, radial or azimuthal polarization, with the particle anywhere around the focus.
From vector diffraction theory, valid up to the highest numerical apertures, expanded into the spheroid's multipoles and solved with its exact T-matrix.
A nanorod in a tightly focused laser of any polarization, in one click.