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Thresholdless nanoscale coaxial lasers.

M Khajavikhan1, A Simic, M Katz

  • 1Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA. mercedeh@umn.edu

Nature
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed novel coaxial nanocavities for the ultimate nanolaser. These cavities enable the smallest room-temperature lasers and thresholdless lasing, advancing cavity quantum electrodynamics (QED) applications.

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Area of Science:

  • Quantum optics and photonics
  • Nanotechnology and materials science
  • Electromagnetism and condensed matter physics

Background:

  • Cavity quantum electrodynamics (QED) studies matter-electromagnetic field interactions in resonant structures.
  • Subwavelength resonant structures are key for exploring QED effects and developing advanced photonic devices.
  • Existing nanolaser designs face challenges in scaling down cavity size without increasing lasing thresholds.

Purpose of the Study:

  • To develop a scalable, low-threshold, efficient nanolaser operating at room temperature.
  • To overcome the limitations of current nanoresonators in achieving smaller sizes and lower lasing thresholds.
  • To explore new platforms for cavity quantum electrodynamics (QED) devices and metamaterials.

Main Methods:

  • Design and fabrication of a novel family of coaxial nanostructured cavities.
  • Utilizing specific geometry and metal composition to address resonator scalability.
  • Demonstration of lasing performance at telecommunications frequencies.

Main Results:

  • Demonstrated the smallest room-temperature, continuous-wave laser operating at telecommunications frequencies.
  • Achieved thresholdless lasing by modifying coaxial nanocavity design with a broadband gain medium.
  • The coaxial nanocavities offer a scalable solution to nanolaser resonator challenges.

Conclusions:

  • The developed coaxial nanocavities represent a significant advancement in nanolaser technology.
  • These nanoscale resonators provide a powerful platform for future QED devices and metamaterials.
  • The findings pave the way for on-chip optical communication, advanced imaging, and sensing applications.