Figure 9: Measured surface transmissions when different kinds of defects are introduced near the surface. | Nature Communications

Figure 9: Measured surface transmissions when different kinds of defects are introduced near the surface.

From: Photonic crystals possessing multiple Weyl points and the experimental observation of robust surface states

Figure 9

(a,b) Photograph of the samples with defects. (c,d) Measured transmission spectra for two kinds of defects when the incident angle θ=35° (kz=0.2581π/d for 12.5 GHz). (e), (f) Results for θ=50° (kz=0.3447π/d for 12.5 GHz). Cyan boxes in c–f highlight the frequency region of kz-preserved one-way surface states where no obvious backscattering is introduced by the two kinds of defects. Note that the frequency region of robust transport for θ=50° is wider than that for θ=35°. This is consistent with the fact that the nontrivial band gap in the reduced 2D Brillouin zone is wider for a larger kz.

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