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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Physics

Background:

  • Whispering-gallery mode (WGM) resonators are crucial for photonics applications.
  • Achieving high Q factors and directional emission simultaneously in microcavities remains a challenge.

Purpose of the Study:

  • To experimentally demonstrate an asymmetrical spherical microcavity with thermal-induced deformation.
  • To investigate the properties of five-bounce WGM in this deformed microcavity.
  • To develop a low-threshold microlaser with directional emission.

Main Methods:

  • Fabrication of an asymmetrical spherical microcavity.
  • Inducing thermal deformation in the microcavity.
  • Utilizing free-space excitation and collection for optical measurements.
  • Comparing experimental results with theoretical predictions based on corrected Fresnel law.

Main Results:

  • Observed ultrahigh quality factors (Q) for five-bounce WGM.
  • Demonstrated remarkably directional escape emission from the microsphere boundary.
  • Achieved a low-threshold microlaser with highly directional emission.
  • Experimental measurements aligned well with theoretical predictions.

Conclusions:

  • The thermally deformed asymmetrical microcavity effectively supports high-Q WGM.
  • This design enables efficient, directional light emission, suitable for microlaser applications.
  • The findings validate the theoretical model for light propagation in such deformed microcavities.