Broadband Topological Slow Light through Brillouin Zone Winding

Area of Science:

• Photonics
• Condensed Matter Physics
• Materials Science

Background:

• Topological photonic insulators offer robust light transport, immune to scattering and disorder.
• Slow light applications are hindered by disorder-induced signal attenuation.
• Achieving broadband, topologically protected slow light remains a significant challenge.

Purpose of the Study:

• To demonstrate practical broadband, topologically protected slow light.
• To overcome limitations of disorder-induced attenuation in slow light systems.
• To explore new photonic device functionalities using robust slow light.

Main Methods:

• Designing topologically unidirectional waveguides.
• Periodically loading waveguide edges with tailored resonances.
• Analyzing edge state dispersion and topological protection.

Main Results:

• Achieved slow light in topologically unidirectional waveguides.
• Demonstrated broadband operation sustained by the engineered edge state.
• Exhibited robustness against scattering and disorder due to topological protection.

Conclusions:

• Successfully implemented broadband, topologically protected slow light.
• The engineered resonance approach enables robust slow light propagation.
• Opens new avenues for photonic devices requiring reliable light manipulation.