Figure 1: Calculated field and current distributions around a subwavelength hole.
From: Bethe-hole polarization analyser for the magnetic vector of light
The metal film has been assumed to be a near-perfect electric conductor with a hole diameter of 0.08λ and a thickness of 0.02λ. (a,b) Normalized electric and magnetic field strength distribution with the normal incidence (
,
), respectively. (c) Schematic of setup with an oblique incidence (θ≠0°) 
in the xz plane, with the polarization angle φ. (d,e) Surface current distribution on the exit side of the hole for φ=21° and 159° with fixed θ of 80°, respectively. 
and 
are depicted as red and blue arrows inside the hole, respectively. The white arrows represent the direction of the surface current.
