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Lasing from Brillouin Zone Folding Guided Resonances.

Matthew R Chua1, Lu Ding1, Xiao Liang2

  • 1Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.

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Summary

Researchers demonstrated a novel Brillouin Zone folding guided resonance (BZF-GR) method for high-quality factor nanophotonic cavities. This technique enables efficient vertical emission lasing with a low threshold, advancing nanoscale laser development.

Keywords:
Brillouin zone foldingnanosecond lasingquantum dotstwo-dimensional metasurfacesvertical lasing

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Area of Science:

  • Nanophotonics
  • Quantum Optics
  • Materials Science

Background:

  • High-quality factor (Q-factor) nanophotonic cavities are essential for lasing and nonlinear optics.
  • Achieving out-of-plane emission and low lasing thresholds requires modes that couple to the light cone while maintaining high Q-factors, a challenging design constraint.

Purpose of the Study:

  • To experimentally demonstrate the use of Brillouin Zone folding guided resonance (BZF-GR) for vertical emission lasing.
  • To achieve a low lasing threshold in nanophotonic cavities using this novel mode design.

Main Methods:

  • Utilized a nanophotonic cavity with colloidal quantum dots as the gain medium.
  • Employed Brillouin Zone folding guided resonance (BZF-GR) to design lasing modes that are folded into the light cone via periodic perturbations.
  • Experimentally demonstrated vertical emission lasing.

Main Results:

  • Achieved vertical emission lasing from a nanophotonic cavity using the BZF-GR design.
  • Recorded a lowest lasing threshold fluence of (20.4 ± 0.3) μJ cm⁻² under nanosecond pump.
  • Determined an absorption-corrected threshold fluence of (4.08 ± 0.08) μJ cm⁻².

Conclusions:

  • The BZF-GR method provides a viable approach for designing high-Q modes that couple to the light cone for vertical emission.
  • This work presents a promising strategy for developing low-threshold nanoscale lasers.
  • The BZF-GR technique offers fine control over Q-factors in momentum space, enabling tailored nanophotonic cavity designs.