Figure 2: The electromagnetic field is focused at the centre of the left hand edge of the left elliptical disk, which contains a subwavelength sized notch.
From: Whispering galleries and the control of artificial atoms
The propagation of the electric field can create a frequency dependent pumping of the system between whispering galleries. The maximum magnetic flux density in the z-direction is shown below the disks in each plot for the corresponding frequencies (shown above).
