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One-Dimensional Moiré Flat-Band Nanolasers with Stable Single-Mode Emission.

Yilan Wang1, Hongyu Li1, Qingyun Liao1

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|November 14, 2025
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Summary

Researchers developed stable single-mode moiré nanolasers using flat-band localization. These nanolasers operate robustly in the telecom C-band, advancing nanoscale light manipulation in photonics.

Keywords:
FlatbandMoiré nanolaserMoiré photonic crystalSingle-mode

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Achieving stable single-mode lasing emission is a significant challenge in photonics.
  • Moiré photonic crystals offer unique properties for light manipulation.

Purpose of the Study:

  • To present robust single-mode moiré nanolasers operating in the telecom C-band.
  • To explore flat-band localization for enhanced lasing properties.

Main Methods:

  • Fabrication of a one-dimensional moiré photonic crystal nanobeam.
  • Utilizing spatially separated flat-band localization.
  • Selective excitation of dual moiré flat-band modes in a nanocavity.

Main Results:

  • Robust single-mode lasing emission achieved in the telecom C-band.
  • Single-mode operation maintained at high excitation power (up to 64.4× threshold).
  • Demonstrated selective lasing from dual moiré flat-band modes.

Conclusions:

  • One-dimensional moiré nanolasers offer sustained single-mode operation and high temperature stability.
  • Flat-band engineering is a promising strategy for nanoscale light manipulation.
  • The study provides insights into moiré physics in active photonic systems.