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Lasing Action in Single Subwavelength Particles Supporting Supercavity Modes.

Vasilii Mylnikov1,2, Son Tung Ha1, Zhenying Pan1

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Summary

Researchers developed ultra-small semiconductor nanolasers using quasibound states in the continuum ( a supercavity effect). This breakthrough overcomes previous size limitations for on-chip photonic circuits.

Keywords:
Mie resonancebound state in the continuumdielectric nanoantennasgallium arsenidelasernanolaser

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Area of Science:

  • Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Integrated photonic circuits require miniaturized on-chip light sources.
  • Current semiconductor lasers are limited to micron-scale sizes due to radiative losses.
  • Plasmonic metals reduce size but introduce detrimental Ohmic losses.

Purpose of the Study:

  • To overcome fundamental size limitations in semiconductor nanolasers.
  • To realize ultra-small, purely semiconductor nanolasers for integrated photonics.
  • To demonstrate a novel approach using supercavity modes to enhance laser performance.

Main Methods:

  • Utilizing quasibound states in the continuum (supercavity modes) to enhance cavity quality factor.
  • Designing a nanolaser structure based on a single semiconductor nanocylinder.
  • Exploiting destructive interference between Fabry-Perot and Mie optical modes.
  • Experimentally demonstrating optically pumped lasing action.

Main Results:

  • Realization of one of the smallest purely semiconductor nanolasers to date.
  • Achieved lasing action in a GaAs nanocylinder with a diameter of 500 nm and height of 330 nm.
  • Observed lasing wavelength around 825 nm.
  • Demonstrated a size-to-wavelength ratio as low as 0.6.

Conclusions:

  • Quasibound states in the continuum offer a viable pathway to overcome fundamental limits in nanolaser miniaturization.
  • The demonstrated nanocylinder design enables ultra-compact, high-performance semiconductor lasers.
  • This work paves the way for advanced, fully integrated photonic circuitry.