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Topological quantum cascade laser with Dirac-scaled valley edge modes.
Yunda Chua1, Letian Yu2, Jieyuan Cui1
1Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, Singapore, Singapore.
Nature Communications
|December 11, 2025
Summary
Topological lasers now have a larger mode volume for enhanced robustness. This is achieved by introducing a Dirac region, expanding lasing modes beyond the boundary.
Area of Science:
- Quantum physics
- Laser technology
- Materials science
Background:
- Topological lasers utilize protected boundary states for robustness.
- Conventional designs suffer from limited mode volume due to evanescent confinement.
Purpose of the Study:
- Expand the lasing mode volume in topological lasers under topological protection.
- Enhance laser robustness against defects.
Main Methods:
- Utilized topological quantum cascade lasers with valley edge states.
- Introduced a bulk region with gapless Dirac points at domain interfaces.
Main Results:
- Demonstrated a substantial expansion of the lasing mode volume.
- The topological lasing mode uniformly extended across the new Dirac region.
- Scaled-up mode volume improved robustness against defects.
Conclusions:
- Resolved a fundamental challenge in topological laser design.
- Contributed to developing advanced quantum cascade lasers with improved efficiency and robustness.
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