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Topological nanorainbow laser.

Shouqi Zhang¹, Yongquan Zeng^1,2,3, Xing Hong¹

¹Electronic Information School, Wuhan University, Wuhan 430072, China.

Science Advances

|October 15, 2025

Summary

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This summary is machine-generated.

Researchers developed a topological nanorainbow laser for compact multiwavelength light emission. This innovation offers high performance and spatial isolation, crucial for advanced photonic applications.

Area of Science:

Photonics and Optical Engineering
Condensed Matter Physics
Quantum Optics

Background:

Multiwavelength coherent light sources with spatial isolation are critical for various applications.
Achieving precise control over multiple emission wavelengths at the nanoscale presents significant challenges.

Purpose of the Study:

To realize a high-performance topological nanorainbow laser.
To exploit synthetic dimensions for manipulating optical resonances in photonic crystals.
To enable spectrally isolated and spatially dispersed topological synthetic modes.

Main Methods:

Utilizing synthetic dimensions in parameter space within a photonic crystal gain system.
Designing topological synthetic modes with near-diffraction-limited mode volumes and high-quality factors.

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Investigating the optical resonances and emission characteristics of the nanorainbow laser.

Main Results:

Demonstrated high-performance nanorainbow lasing with a low threshold.
Achieved broadband spectrum, large spontaneous emission factor (β), and milliwatt output power simultaneously.
Exhibited spectrally and spatially isolated topological synthetic modes with predetermined emission features.

Conclusions:

The topological nanorainbow laser enables high-performance, spatially multiplexed multiwavelength emission.
This technology is suitable for on-chip photonics, advancing signal processing and optical computing.
The use of synthetic dimensions offers a novel approach to controlling optical resonances in compact systems.