Fig. 3: Coupled topological waveguide-cavity as an on-chip demultiplexer. | Nature Communications

Fig. 3: Coupled topological waveguide-cavity as an on-chip demultiplexer.

From: Phototunable chip-scale topological photonics: 160 Gbps waveguide and demultiplexer for THz 6G communication

Fig. 3

a Optical image of the fabricated VPC cavity-waveguide chip. Orange lines indicate the domain walls corresponding to VPC waveguide and topological cavity, respectively. b The simulated magnetic field intensity distribution of valley edge state at the cavity resonance frequency (330.2 GHz). The white arrows indicate the Poynting vectors for the edge states. c Projected band diagram for the supercell representing both AB (black dot) and BA (red dot) type domain walls. d Experimentally recorded transmission spectra at ports 2 and 3 through Si-VPC chip. The transmission spectrum corresponding to port 2 (S21) is shown in the solid blue line, while port 3 (S31) is shown with a solid orange line. The carrier frequency corresponding to channel 1 (CH 1) and channel 2 (CH 2) are marked as fc1 = 330.2 GHz and fc2 = 344 GHz, respectively. The blue shaded region in S21 represents the bandwidth (~14 GHz) corresponding to CH 2.

Back to article page