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Related Experiment Videos

Photonic molecule lasing.

Yoshiko Hara1, Takashi Mukaiyama, Kenji Takeda

  • 1Department of Applied Physics, University of Tokyo, Tokyo, Japan.

Optics Letters
|December 24, 2003
PubMed
Summary
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Whispering-gallery mode lasing was achieved in coupled bisphere photonic molecules. Researchers quantitatively measured quality factors and coupling ratios, confirming strong coherent coupling effects.

Area of Science:

  • * Photonics and Optical Physics
  • * Nanophotonics and Plasmonics

Background:

  • * Whispering-gallery modes (WGMs) are fundamental to microcavity lasers.
  • * Coupled microcavities, or photonic molecules, offer enhanced control over light-matter interactions.
  • * Understanding mode coupling is crucial for designing advanced optical devices.

Purpose of the Study:

  • * To investigate lasing phenomena in coupled bisphere photonic molecules.
  • * To spatially characterize the bonding and antibonding modes within these structures.
  • * To quantitatively determine the optical properties, such as quality factor and spontaneous-emission coupling ratio, of photonic molecule modes.

Main Methods:

  • * Fabrication of bisphere photonic molecules using silicon V-grooves.

Related Experiment Videos

  • * Frequency-resolved imaging for spatial mode profiling.
  • * Analysis of lasing threshold characteristics to extract optical parameters.

    • Main Results:

    • * Observed lasing at resonantly coupled WGMs in bisphere photonic molecules (4.2 and 5.1 µm diameters).
    • * Frequency-resolved imaging revealed distinct bonding and antibonding mode spatial profiles.
    • * Quantitative measurements confirmed strong coherent coupling in the photonic molecule modes.

    Conclusions:

    • * Resonantly coupled WGMs support lasing in bisphere photonic molecules.
    • * Spatial mode analysis confirms the nature of coupled modes.
    • * The study validates strong coherent coupling as a mechanism for photonic molecule mode formation and lasing.