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Loss determination in microsphere resonators by phase-shift cavity ring-down measurements.

J Barnes1, B Carver, J M Fraser

  • 1Department of Chemistry, Queen's University, Kingston, ON K7L 3N6, Canada.

Optics Express
|August 20, 2008
PubMed
Summary

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This study measures optical loss in microresonator spheres using phase-shift cavity ring-down. This technique accurately determines optical lifetime and loss in whispering gallery modes.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Whispering gallery modes (WGMs) in microresonators are sensitive to optical loss.
  • Accurate determination of optical loss is crucial for microresonator applications.

Purpose of the Study:

  • To determine the optical loss of whispering gallery modes in microresonator spheres.
  • To validate a phase-shift cavity ring-down technique for optical loss measurements.

Main Methods:

  • Utilized phase-shift cavity ring-down technique for optical lifetime measurements.
  • Measured amplitude modulation phase difference between input and scattered light.
  • Measured phase lag of light exiting the coupling waveguide.

Main Results:

  • Successfully extracted ring-down times and optical loss.

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  • Optical loss measurements were consistent with theoretical models.
  • Interference between cavity modes and waveguide propagation fully described the observed phenomena.

    • Conclusions:

    • Phase-shift cavity ring-down is an effective method for quantifying optical loss in microresonator spheres.
    • The developed model accurately describes the optical behavior of the system.
    • This work contributes to the precise characterization of micro-optical devices.