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Structures under investigation. Light areas are where metal has been removed.
Transmission data for the three structures. 1 data point in 10 is plotted for clarity. Also plotted is the prediction provided from the FEM code.
(a) Time-averaged electric field magnitude for structure A. Incident radiation is polarized with its electric vector perpendicular to the axis. (b) Electric vector for the same structure showing surface waves on the front and back of the metallic layer. Electric vector is plotted at a phase corresponding to maximum field enhancement.
(a) Time-averaged electric field magnitude for structure B. Incident radiation is polarized with its electric vector perpendicular to the axis. (b) Surface currents (indicated by arrowheads) are perturbed by the cut and form a partial current loop (arrows with tails are added for clarity). (c) Partial current loops [shown in (b)] induce magnetic field loops (indicated by arrowheads) between adjacent cuts. (d) The electric vector (indicated by arrowheads) within the slit is rotated by 90° from that of the incident polarization.
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