a, Topography image of an antenna-coupled two-wire transmission line. Its calculated mode profile is shown in e (case A). b, Experimental near-field image taken at λ = 9.3 µm, showing Re(Ez) = |Ez|cos(ϕz). c, Numerically calculated near-field . . . Continued explanation is in the published paper linked in the text.

Image Credit: Rainer Hillenbrand, Nanooptics Group at the nanoscience institute nanoGUNE.

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