One-click electromagnetism at the nanoscale
From the exact solution for an infinite cylinder: the field inside and outside the wire, for light polarized along or across the axis, with optional shells.
With light polarized across the wire, at the two sides facing the polarization, like a two-dimensional version of a sphere's plasmon lobes. With polarization along the axis the field stays weak near metal.
When the wire is much longer than both its diameter and the wavelength: the field near the middle of a long wire is then the same as for an infinite one. For short rods use the spheroid calculators.
The field around and inside a nanowire, from exact cylindrical Mie theory, in one click.