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. 2015 Aug 20;5:13301. doi: 10.1038/srep13301

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(a) A sample plot of frequency vs. measured phase delay through the square lattice along the X direction (with 0° incident angle). (b) A sample plot of frequency vs. calculated wavenumber, for the square lattice along the X direction. (c) Dispersion relation along the irreducible Brillouin zone boundary reconstructed from measured phase data for the square lattice, plotted on top of the theoretically calculated bands results (thin solid curves). (Blue dots—the X direction, folded from data in Fig. 4b; Green dots—the M direction; and red dots—angles in between X and M). (d) Dispersion relation along an arbitrary direction in the HUD sample reconstructed from measured phase data.