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A nanolaser with extreme dielectric confinement
Meng Xiong1,2, Yi Yu1,2, Yury Berdnikov1
1Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 345A, DK-2800 Lyngby, Denmark.
Science Advances
|December 17, 2025
Summary
Researchers developed a novel dielectric nanolaser that confines both light and carriers. This breakthrough enables room-temperature continuous-wave lasing with a lower threshold by enhancing light-matter interactions.
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.
