What question did this study set out to answer?

This work aims to explore multifunctional topological photonic crystals that utilize hybrid domain walls for light manipulation.

July 8, 2026PhotonicsOpen Access

Hybrid Valley-Polarized Topological Photonic Waveguides for Nonreciprocal Coupling and Configurable Routing

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Randomized trial investigates nonreciprocal coupling of valley-polarized edge states in photonic crystals, suggesting innovative device applications.

This work aims to explore multifunctional topological photonic crystals that utilize hybrid domain walls for light manipulation.
Designed two types of compact topological photonic devices with hybrid domain walls.
Investigated direction-selective coupling between valley edge states and valley-polarized chiral edge states.
Constructed nonreciprocal coupled waveguides and a multi-channel selective routing device based on external magnetic field configurations.
Achieved a nonreciprocal transmission ratio of 10 dB and an output-port isolation ratio of over 30 dB.
Demonstrated configurable transport of valley-polarized electromagnetic waves across multiple channels.
Provided a foundation for developing multifunctional integrated topological photonic networks.

Hou et al. (2026) studied this question.

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Randomized trial investigates nonreciprocal coupling of valley-polarized edge states in photonic crystals, suggesting innovative device applications.