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Propagation of Waves

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Landau rainbow based on Floquet helical waveguide systems.

Rong Zhou, Zhihao Wang, Wenshuo Ma

|June 13, 2025

Summary

Researchers demonstrate a Landau rainbow in Floquet helical waveguide systems. This topological phenomenon separates light frequencies spatially, enabling applications in broadband photonic devices and optical information storage.

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Area of Science:

Topological photonics
Condensed matter physics

Background:

Topological rainbows spatially separate photonic states by frequency.
Landau levels are crucial for understanding topological bulk states and discovering new phenomena.
Landau rainbows, a type of topological rainbow, separate Landau mode frequencies spatially, offering potential for broadband photonic devices.

Purpose of the Study:

To propose and demonstrate a Landau rainbow effect using the zero-order Landau level in Floquet helical waveguide systems.
To explore the potential applications of this novel Landau rainbow in photonic devices.

Main Methods:

Inducing photonic Landau levels via a pseudo-magnetic field by engineering gradient effective coupling strength.
Utilizing the helical configuration of waveguides to break the degeneracy of zero-order Landau levels, leading to band tilting.
Observing the spatial separation of states in the zero-order Landau level due to distinct quasienergies.

Main Results:

Successfully realized a Landau rainbow effect in Floquet helical waveguide systems.
Demonstrated that different frequencies of Landau modes are localized at distinct spatial positions.
Showcased the band tilting of zero-order Landau levels due to helical waveguide configuration.

Conclusions:

The proposed Landau rainbow in Floquet helical waveguide systems offers a novel approach for robust photonic device design.
This platform enables new avenues for creating devices such as rainbow trapping devices, multifrequency dividers, and optical information storage systems.