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Dual-band multi-frequency wave routing based on photonic square-root topological insulators
Optics Letters
|March 13, 2026
Summary
This study introduces a novel dual-band multi-frequency wave routing system using photonic square-root topological insulators. The innovative design routes four distinct frequency ranges within a single structure, advancing integrated photonic devices.
Area of Science:
- Photonics
- Condensed Matter Physics
- Materials Science
Background:
- Existing topological dual-band frequency routers handle signals in separate bands.
- The full potential of dual topological bands, including multi-frequency channel support, remains underexplored.
Purpose of the Study:
- To propose and demonstrate a dual-band multi-frequency wave routing system.
- To explore the capability of photonic square-root topological insulators for multi-channel frequency routing.
Main Methods:
- Utilizing photonic square-root topological insulators.
- Introducing tailored perturbations into a decorated honeycomb lattice.
- Designing two distinct topological interfaces to achieve multi-frequency topological edge states.
Main Results:
- Successfully opened two band gaps within the designed lattice structure.
- Achieved multi-frequency topological edge states.
- Demonstrated a single structure capable of routing signals across four different frequency ranges.
Conclusions:
- The proposed system offers a novel approach for dual-band multi-frequency wave routing.
- Photonic square-root topological insulators are a promising platform for advanced integrated photonic devices.
- This work expands the application scope of topological photonics.
