Fig. 4: Valley edge states in the domain wall systems consisting of HTPCs. | Nature Communications

Fig. 4: Valley edge states in the domain wall systems consisting of HTPCs.

From: Hybrid topological photonic crystals

Fig. 4: Valley edge states in the domain wall systems consisting of HTPCs.The alt text for this image may have been generated using AI.

a, e Illustration of domain wall formed by HTPC1 and HTPC2. In a DW1 refers to the configuration with HTPC1 above HTPC2. In e DW2 refers to the configuration with HTPC1 below HTPC2. Note that the supercells are extended into four periods in the x-direction to show the direction of the edge channel. Insets: Photographs of the experimental samples. b, f The simulated (solid lines) and shifted experimental (solid circles) valley edge dispersions for DW1 (b) and DW2 (f). The gray area refers to the bulk states. c, g The simulated electric field patterns of the edge states c in DW1: A and B and g in DW2: C and D. Insets: the Poynting vector profiles of the edge states around the domain walls. d, h Forward transmission spectra versus wavevectors for d DW1 with the frequency of 13.13 GHz (upper panel) and 12.66 GHz (lower panel), h DW2 with the frequency of 13.03 GHz (upper panel) and 12.74 GHz (lower panel). Insets: schematics of the measurement setups.

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