Hybrid topological photonic crystals

Area of Science:

• Condensed matter physics
• Photonics
• Topological materials

Background:

• Topologically protected photonic edge states enable robust photon propagation.
• These states are crucial for applications in waveguiding, lasing, and quantum information processing.

Purpose of the Study:

• To discover and characterize a new class of hybrid topological photonic crystals.
• To investigate the simultaneous hosting of quantum anomalous Hall and valley Hall phases.
• To demonstrate the potential of these hybrid topological insulators in photonic devices.

Main Methods:

• Fabrication of hybrid topological photonic crystals.
• Experimental verification of topological transitions and dual-band edge states using pump-probe techniques.
• Demonstration of frequency-multiplexing capabilities.

Main Results:

• Discovery of hybrid topological photonic crystals hosting simultaneous quantum anomalous Hall and valley Hall phases.
• Observation of dual-band chiral edge states and unbalanced valley Hall edge states.
• Experimental validation of unconventional dual-band gap topological edge states.
• Demonstration of edge channels as frequency-multiplexing beam splitters and combiners.

Conclusions:

• Hybrid topological insulators represent an exotic topological state of photons.
• These findings offer a promising route for future applications in topological photonics.
• The demonstrated dual-band edge channels can be utilized for advanced photonic devices.