A Topological Photonic Ring-Resonator for On-Chip Channel Filters

A topologically protected ring-resonator formed in valley photonic crystals is proposed and fabricated on a silicon slab. The unidirectional transmission and robustness against structure defects of its resonant modes are illustrated. Coupled with topological waveguides, the topological ring is functioned as notch and channel-drop filters. The work opens up a new avenue for developing advanced chip-integrated photonic circuits with attributes of topological photonics.

Automated summary

This study proposes and fabricates a topologically protected ring-resonator formed in valley photonic crystals on a silicon slab, demonstrating its unidirectional transmission and robustness against structure defects. Coupled with topological waveguides, the topological ring functions as notch and channel-drop filters, opening up a new avenue for developing advanced chip-integrated photonic circuits with attributes of topological photonics.