Figure 4
From: Magnetic Nature of Light Transmission through a 5-nm Gap
Magnetic field amplitude at the gap entrance versus the gap width with normal incidence for gap dielectrics of Al2O3 (black solid line) and air (green solid line). For widths below 100 nm, the gap field amplitude oscillates around the value given by the Fresnel equations (gray dashed line). Whereas, the field amplitude in conventional macroscopic slits converges to the value of the dielectric thin film (black and green dashed lines), regardless of the side metal faces.
