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Researchers developed on-chip random nanolasers using Anderson localization of light. This breakthrough enhances laser stability and efficiency by controlling light scattering and confinement, paving the way for advanced photonic devices.

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Area of Science:

  • Photonics and Nanotechnology
  • Quantum Optics
  • Materials Science

Background:

  • Fabrication imperfections in nanoscale optical devices limit performance.
  • Disorder in materials can enable functionalities like random lasers, but face limitations such as multidirectional emission and weak mode confinement.
  • Anderson localization of light offers a potential solution for stable multimode random lasing, with prior work on macroscopic media.

Purpose of the Study:

  • To demonstrate on-chip random nanolasers utilizing intrinsic disorder for cavity feedback.
  • To investigate the role of Anderson localization in improving random laser stability and performance.
  • To explore the interplay of gain, slow light, and disorder in non-conservative random media.

Main Methods:

  • Fabrication of on-chip nanolasers incorporating intrinsic disorder.
  • Utilizing Anderson localization principles for strong light confinement.
  • Experimental investigation of gain, dispersion-controlled slow light, and disorder interactions.
  • Statistical analysis of lasing performance and localization length.

Main Results:

  • Successful demonstration of on-chip random nanolasers with disorder-induced feedback.
  • Anderson localization significantly reduced mode competition and enhanced laser stability.
  • Achieved highly efficient, stable, broadband, and wavelength-controlled lasers with small mode volumes.
  • Experimental evidence of the complex interplay between gain, slow light, and disorder in a non-conservative random medium.

Conclusions:

  • On-chip random nanolasers based on Anderson localization offer a promising platform for stable and efficient light sources.
  • Reducing the localization length is identified as a key parameter for optimizing random-lasing performance.
  • This work advances the development of tunable and stable nanoscale lasers for classical and quantum photonics applications.