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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Electronics

Background:

  • Plasmonic structures offer light confinement but incur ohmic losses.
  • Dielectric nanostructures provide strong light localization without metallic losses.
  • Previous research minimized optical mode volume, neglecting light-matter interactions.

Purpose of the Study:

  • To demonstrate a nanolaser platform that colocalizes photons and excited carriers.
  • To achieve subdiffraction-limited mode volume and subwavelength carrier volume.
  • To enhance light-matter interactions for improved lasing performance.

Main Methods:

  • Fabrication of a dielectric nanobridge structure.
  • Achieving extreme dielectric confinement of light and matter.
  • Suppressing carrier surface recombination.

Main Results:

  • Demonstrated colocalization of photons and carriers within the nanobridge.
  • Observed a strong correlation between mode field and carrier distribution.
  • Achieved continuous-wave lasing at room temperature with a reduced threshold.

Conclusions:

  • The dielectric nanolaser platform enhances light-matter interactions via extreme confinement.
  • This approach enables efficient room-temperature operation and low lasing thresholds.
  • The concept of interaction volume generalizes mode volume for active media.