Figure 13
Two-dimensional images showing the (a) real part \({\varvec{Re}}\left( {{\varvec{\beta}}_{{\varvec{z}}} {\varvec{e}}^{{ - {\varvec{i}}\phi_{{\varvec{z}}} }} } \right)\) (a.u.) and (b) phase \(\phi_{{\varvec{z}}}\) (rads/\({\varvec{\pi}}\)) of the out-of-plane field component supported by the DA, obtained by THz-s-SNOM and applying the GPSA with \({\varvec{N}} =\)4 measurements per pixel. The first and last pixels of each row and column correspond to the substrate region of the sample. Both images have been generated by concatenating 1D scans taken at different y-positions on the sample.
